BASIS Interview 7
SAP BASIS Interview 7
Where the transport data files will
be placed?
How to make security authorization reports?
In which table failed user login attempts will be there?
How to see the t able entry values?
How you will give new authorizations?
Have you participated in Kernel upgrading and OCS Patches?
Have you done any up gradations?
How to configure TMS?
What is transport domain?
What is Consolidation route and delivery routes? How you will identify them?
Transport error codes and their description?
The transaction should not be displayed in User Easy access menu but he must execute that transaction how to do that?
How to make security authorization reports?
In which table failed user login attempts will be there?
How to see the t able entry values?
How you will give new authorizations?
Have you participated in Kernel upgrading and OCS Patches?
Have you done any up gradations?
How to configure TMS?
What is transport domain?
What is Consolidation route and delivery routes? How you will identify them?
Transport error codes and their description?
The transaction should not be displayed in User Easy access menu but he must execute that transaction how to do that?
1.What is the difference between System Trace, Developer
Trace and System Log?
System Trace:
If you want to record the internal SAP system activities, use the function SAP System Trace. Recording the processes in your application server enables you to monitor the system and facilitates troubleshooting.
Developer Trace:
Developer traces contain technical information for use in the event of problems with your system. Using the entries in the developer traces requires a sophisticated knowledge of the host systems in which your SAP system is running and of the SAP system itself.
System Log:
You can use the log to pinpoint and correct errors occurring in your system and its environment.
To work with system logs, choose Tools ® Administration from the R/3 initial screen. When the System Administration initial screen appears, choose Monitoring ® System log. Alternatively, you can choose Test ® System log from the ABAP/4 Development Workbench initial screen.
2.Incase, My sap system was down (Users are unable to login to sap system) How to analyze this problem?
Check if all the services of SAP, Database, SAPOSCOL are up and running.
check the wp status using dpmon.
Try restarting the workprocess., if that does not work., than try to kill some of the jobs. Else., restart the application Server.
3.How to import the transport request at operating system Level? When importing a transport request, what are the common errors you faced?
tp import client U123689
RC 8 & 12
4.For example, my sap system having patch number was 8.I want to apply patch 9 and 10.Mistakenly I will apply the patch directly 11 without
applying 9 and 10.How sap system will recognize this problem?
Firstly, the dependencies are checked. And without performing a test import no BASIS consultant would import a support pack. If you did that., than clear the OCS queue by running OCS_RESET_QUEUE in SE37 than import SP9 and SP10. If it is JAVA stack than no need to make changes you can directly apply SP11.
5.One user unable to execute one t-code, that is authorization object is missing, How to add this authorization object to user?
Take the SU53 screenshot., based on the output results., you can search for authorizations that are existing in the system. If the authorization is available and you receive an approval from the concerned HOD or the concerned person., than you can directly attach the authorization. If there is no authorization available., than the functional lead or the HOD will revert back to you saying that you need to create the Role or make modifications in an existing role. Than do that in DEV, transport it to QAS and PRD.
6.for example, consider a client 800.This client having 75 users. But 15 users account was locked. I want to unlock this 15 users account at
a time. How to do?
Using T-code SU10.
7.what is the use of parameter tab, and personalization tab in user master record? What is the use of account id in logon tab?
8.how to change the number of work process at OS level? How to analyze the status of work process at OS level?
By editing the instance profile at the OS level, you can increase the no. of work processes by adding or modifying the parameter rdisp/wp_no_=
Status of a WP can be checked at the OS level by executing dpmon.
9.For example, my sap system having 4 application sersvers. How many enqueue work process allowed for this sap system?
1 (you can increase them by making modifications in rdisp/wp_no_enq)
10.What is the latest version of sap kernel? Can u give me the list of kernel versions?
service.sap.com/swdc
710 (Demo version is available)
700
640
620
610 (WEB AS was introduced in this version)
4.6D
4.5
4.0
3.1
3.0
11.what are the prerequisite for before applying support packs? Shall I apply sap basis patch to all the system, like BW, ABAP, HR, etc.
Dependency check.... check if the new SP to be installed has any dependent coponents in any of the other SP's.
You must implement different SP's for different components in SAP.
12.For example, I want to transfer 50GB of data from DEV to Quality. I am using client export and import method; can you tell me how many
hours take for client export and import? And also How many hours take for remote client copy?
Data transfer rate depends on the H/W Configuration and N/w Speed in Remote Client copy.
13.How to perform a client import and export at OS level?
using r3trans or tp
14.What is the use of reference and service user in sap?
15.For example, I scheduled one ABAP program as a background job, But it was running 10 days and above. How to analyze this problem?
what is the selection criteria?
16.How to take a sap backup using BRTOOLS explain the procedure? When using BRTOOLS, which backup device, you are used (Drive/tape) ?
refer inist.sap file.
17.When applying a support pack to sap system. Can you tell me what are errors you are faced?
18.In CUA, I am unable to changes from DEV to QAS or PRD.How to troubleshoot this problem?
19.In CUA, What is the use of distribution model, partener profile, BAPI?
20.what is the user group and use in sap?
21.Example you have 6 sap application servers, I want to monitor all the application servers. How to configure a CCMS?
22.what are the configuration details of ECC6.0?
HDD, RAM, OS, DATABASE.è1.Server Configuration
HDD, RAM, OS, DATABASE.è2. System Configuration
23.What are things we have to monitor in ST02, ST06, ST04, and ST03?
We can monitor many things in the above T-codes. What exact info do u need?
24.what is the name of your output device, device type in printer?
25.Can you tell me the path in service market place for download support packs and kernel?
service.sap.com/swdc
System Trace:
If you want to record the internal SAP system activities, use the function SAP System Trace. Recording the processes in your application server enables you to monitor the system and facilitates troubleshooting.
Developer Trace:
Developer traces contain technical information for use in the event of problems with your system. Using the entries in the developer traces requires a sophisticated knowledge of the host systems in which your SAP system is running and of the SAP system itself.
System Log:
You can use the log to pinpoint and correct errors occurring in your system and its environment.
To work with system logs, choose Tools ® Administration from the R/3 initial screen. When the System Administration initial screen appears, choose Monitoring ® System log. Alternatively, you can choose Test ® System log from the ABAP/4 Development Workbench initial screen.
2.Incase, My sap system was down (Users are unable to login to sap system) How to analyze this problem?
Check if all the services of SAP, Database, SAPOSCOL are up and running.
check the wp status using dpmon.
Try restarting the workprocess., if that does not work., than try to kill some of the jobs. Else., restart the application Server.
3.How to import the transport request at operating system Level? When importing a transport request, what are the common errors you faced?
tp import client U123689
RC 8 & 12
4.For example, my sap system having patch number was 8.I want to apply patch 9 and 10.Mistakenly I will apply the patch directly 11 without
applying 9 and 10.How sap system will recognize this problem?
Firstly, the dependencies are checked. And without performing a test import no BASIS consultant would import a support pack. If you did that., than clear the OCS queue by running OCS_RESET_QUEUE in SE37 than import SP9 and SP10. If it is JAVA stack than no need to make changes you can directly apply SP11.
5.One user unable to execute one t-code, that is authorization object is missing, How to add this authorization object to user?
Take the SU53 screenshot., based on the output results., you can search for authorizations that are existing in the system. If the authorization is available and you receive an approval from the concerned HOD or the concerned person., than you can directly attach the authorization. If there is no authorization available., than the functional lead or the HOD will revert back to you saying that you need to create the Role or make modifications in an existing role. Than do that in DEV, transport it to QAS and PRD.
6.for example, consider a client 800.This client having 75 users. But 15 users account was locked. I want to unlock this 15 users account at
a time. How to do?
Using T-code SU10.
7.what is the use of parameter tab, and personalization tab in user master record? What is the use of account id in logon tab?
8.how to change the number of work process at OS level? How to analyze the status of work process at OS level?
By editing the instance profile at the OS level, you can increase the no. of work processes by adding or modifying the parameter rdisp/wp_no_=
Status of a WP can be checked at the OS level by executing dpmon.
9.For example, my sap system having 4 application sersvers. How many enqueue work process allowed for this sap system?
1 (you can increase them by making modifications in rdisp/wp_no_enq)
10.What is the latest version of sap kernel? Can u give me the list of kernel versions?
service.sap.com/swdc
710 (Demo version is available)
700
640
620
610 (WEB AS was introduced in this version)
4.6D
4.5
4.0
3.1
3.0
11.what are the prerequisite for before applying support packs? Shall I apply sap basis patch to all the system, like BW, ABAP, HR, etc.
Dependency check.... check if the new SP to be installed has any dependent coponents in any of the other SP's.
You must implement different SP's for different components in SAP.
12.For example, I want to transfer 50GB of data from DEV to Quality. I am using client export and import method; can you tell me how many
hours take for client export and import? And also How many hours take for remote client copy?
Data transfer rate depends on the H/W Configuration and N/w Speed in Remote Client copy.
13.How to perform a client import and export at OS level?
using r3trans or tp
14.What is the use of reference and service user in sap?
15.For example, I scheduled one ABAP program as a background job, But it was running 10 days and above. How to analyze this problem?
what is the selection criteria?
16.How to take a sap backup using BRTOOLS explain the procedure? When using BRTOOLS, which backup device, you are used (Drive/tape) ?
refer inist.sap file.
17.When applying a support pack to sap system. Can you tell me what are errors you are faced?
18.In CUA, I am unable to changes from DEV to QAS or PRD.How to troubleshoot this problem?
19.In CUA, What is the use of distribution model, partener profile, BAPI?
20.what is the user group and use in sap?
21.Example you have 6 sap application servers, I want to monitor all the application servers. How to configure a CCMS?
22.what are the configuration details of ECC6.0?
HDD, RAM, OS, DATABASE.è1.Server Configuration
HDD, RAM, OS, DATABASE.è2. System Configuration
23.What are things we have to monitor in ST02, ST06, ST04, and ST03?
We can monitor many things in the above T-codes. What exact info do u need?
24.what is the name of your output device, device type in printer?
25.Can you tell me the path in service market place for download support packs and kernel?
service.sap.com/swdc
Related same Anwers for above Questions
1.What is the difference between System Trace, Developer
Trace and System Log?
2.Incase, My sap system was down (Users are unable to login to sap system) How to analyze this problem?
a) Check Database status
b) SAP services
c) SAP Management console (Dispatcher, IGS and Message Server)
d) On the basis of point at serial no (c), you need to findout trace root
e) If all are ok, check network connectivity
3.How to import the transport request at operating system Level? When importing a transport request, what are the common errors you faced?
4.For example, my sap system having patch number was 8.I want to apply patch 9 and 10.Mistakenly I will apply the patch directly 11 without applying 9 and 10.How sap system will recognize this problem?
If case there is some dependency, system will prompt an error for pre-requisite while importing Patch
5.One user unable to execute one t-code, that is authorization object is missing, How to add this authorization object to user?
Use Tcode:PFCG, Click on Authorisation, Change Authorisation Data, Click on search to check for authorization object, add the value
6.for example, consider a client 800.This client having 75 users. But 15 users account was locked. I want to unlock this 15 users account at a time. How to do?
Use Tcode: SU10 for mass changes
7.what is the use of parameter tab, and personalization tab in user master record? What is the use of account id in logon tab?
8.how to change the number of work process at OS level? How to analyze the status of work process at OS level?
9.For example, my sap system having 4 application sersvers. How many enqueue work process allowed for this sap system?
10.What is the latest version of sap kernel? Can u give me the list of kernel versions?
Latest version is 196, You check status of sap version, login SAP GUI, click on status, click on other Kernel info
11.what are the prerequisite for before applying support packs? Shall I apply sap basis patch to all the system, like BW, ABAP, HR, etc.
You need to check dependency before applying, SPAM should be latest, then SAP Basis, APPL, ABA , after ward another patches
12.For example, I want to transfer 50GB of data from DEV to Quality. I am using client export and import method; can you tell me how many hours take for client export and import? And also How many hours take
for remote client copy?
13.How to perform a client import and export at OS level?
Use Tcode: SCC7, SCC8, you need to copy request file from Dev to Quality.
14.What is the use of reference and service user in sap?
15.For example, I scheduled one ABAP program as a background job, But it was running 10 days and above. How to analyze this problem?
Use Tcode: SM50
16.How to take a sap backup using BRTOOLS explain the procedure? When using BRTOOLS, which backup device, you are used (Drive/tape) ?
17.When applying a support pack to sap system. Can you tell me what are errors you are faced?
Q locked, Dependency Patch not implemented
18.In CUA, I am unable to changes from DEV to QAS or PRD.How to troubleshoot this problem?
19.In CUA, What is the use of distribution model, partener profile, BAPI?
20.what is the user group and use in sap?
21.Example you have 6 sap application servers, I want to monitor all the application servers. How to configure a CCMS?
22.what are the configuration details of ECC6.0?
HDD, RAM, OS, DATABASE.è1.Server Configuration
HDD, RAM, OS, DATABASE.è2. System Configuration
23.What are things we have to monitor in ST02, ST06, ST04, and ST03?
24.what is the name of your output device, device type in printer?
25.Can you tell me the path in service market place for download support packs and kernel?
Click on Support Packages and Patches-> Support package stack/ Support package stack à ECCà Next StepàSelect “SAP KERNEL 6.40 32-BIT for SAP ECC Server (From SP000 to SP101) / MS SQL Server and Database Independent àNext Step"/ SAP ERP 2004/" SAP ERP"My Company's Application Components/
2.Incase, My sap system was down (Users are unable to login to sap system) How to analyze this problem?
a) Check Database status
b) SAP services
c) SAP Management console (Dispatcher, IGS and Message Server)
d) On the basis of point at serial no (c), you need to findout trace root
e) If all are ok, check network connectivity
3.How to import the transport request at operating system Level? When importing a transport request, what are the common errors you faced?
4.For example, my sap system having patch number was 8.I want to apply patch 9 and 10.Mistakenly I will apply the patch directly 11 without applying 9 and 10.How sap system will recognize this problem?
If case there is some dependency, system will prompt an error for pre-requisite while importing Patch
5.One user unable to execute one t-code, that is authorization object is missing, How to add this authorization object to user?
Use Tcode:PFCG, Click on Authorisation, Change Authorisation Data, Click on search to check for authorization object, add the value
6.for example, consider a client 800.This client having 75 users. But 15 users account was locked. I want to unlock this 15 users account at a time. How to do?
Use Tcode: SU10 for mass changes
7.what is the use of parameter tab, and personalization tab in user master record? What is the use of account id in logon tab?
8.how to change the number of work process at OS level? How to analyze the status of work process at OS level?
9.For example, my sap system having 4 application sersvers. How many enqueue work process allowed for this sap system?
10.What is the latest version of sap kernel? Can u give me the list of kernel versions?
Latest version is 196, You check status of sap version, login SAP GUI, click on status, click on other Kernel info
11.what are the prerequisite for before applying support packs? Shall I apply sap basis patch to all the system, like BW, ABAP, HR, etc.
You need to check dependency before applying, SPAM should be latest, then SAP Basis, APPL, ABA , after ward another patches
12.For example, I want to transfer 50GB of data from DEV to Quality. I am using client export and import method; can you tell me how many hours take for client export and import? And also How many hours take
for remote client copy?
13.How to perform a client import and export at OS level?
Use Tcode: SCC7, SCC8, you need to copy request file from Dev to Quality.
14.What is the use of reference and service user in sap?
15.For example, I scheduled one ABAP program as a background job, But it was running 10 days and above. How to analyze this problem?
Use Tcode: SM50
16.How to take a sap backup using BRTOOLS explain the procedure? When using BRTOOLS, which backup device, you are used (Drive/tape) ?
17.When applying a support pack to sap system. Can you tell me what are errors you are faced?
Q locked, Dependency Patch not implemented
18.In CUA, I am unable to changes from DEV to QAS or PRD.How to troubleshoot this problem?
19.In CUA, What is the use of distribution model, partener profile, BAPI?
20.what is the user group and use in sap?
21.Example you have 6 sap application servers, I want to monitor all the application servers. How to configure a CCMS?
22.what are the configuration details of ECC6.0?
HDD, RAM, OS, DATABASE.è1.Server Configuration
HDD, RAM, OS, DATABASE.è2. System Configuration
23.What are things we have to monitor in ST02, ST06, ST04, and ST03?
24.what is the name of your output device, device type in printer?
25.Can you tell me the path in service market place for download support packs and kernel?
Click on Support Packages and Patches-> Support package stack/ Support package stack à ECCà Next StepàSelect “SAP KERNEL 6.40 32-BIT for SAP ECC Server (From SP000 to SP101) / MS SQL Server and Database Independent àNext Step"/ SAP ERP 2004/" SAP ERP"My Company's Application Components/
You can refer http://pragyarawal.blogspot.com/ for more
java interview questions.
By: | 21 Jul
2010
ANSWER for some Unanswered questions
14. a) Reference user is user to to provide the Authorization uo another user
b)Service user no change password .EG . if u created user as dialog .at first login u have to change the pwd. but in service user no need
15. Due to program Error inform to developer to correct the program
20.User group is user to Group the User.it is crated in T.Code-SUGR
25. service.sap.com/swdc/support package /my company applications
14. a) Reference user is user to to provide the Authorization uo another user
b)Service user no change password .EG . if u created user as dialog .at first login u have to change the pwd. but in service user no need
15. Due to program Error inform to developer to correct the program
20.User group is user to Group the User.it is crated in T.Code-SUGR
25. service.sap.com/swdc/support package /my company applications
There are many ways through which you can get the Version
Number of SAP Kernel.
One of the method is from any window in the top menu go to
system--> status and click on the other kernel info button which is between the navigate and cancel buttons.
Another method is to login as administrator and enter the following disp+work -v. in command field on left top corner. This will show you the kernel version of SAP.
You can also check the log or trace files at os level /usr/sap/work/dev_disp.
You can also get this kernel information from sm51 screen. Go to transaction sm51 then click on database server (single click only. Not double click) and then click on release notes. Then you will see the kernel information and patch level.
One of the method is from any window in the top menu go to
system--> status and click on the other kernel info button which is between the navigate and cancel buttons.
Another method is to login as administrator and enter the following disp+work -v. in command field on left top corner. This will show you the kernel version of SAP.
You can also check the log or trace files at os level /usr/sap/work/dev_disp.
You can also get this kernel information from sm51 screen. Go to transaction sm51 then click on database server (single click only. Not double click) and then click on release notes. Then you will see the kernel information and patch level.
This is a critical and security feature. You can know
whether some one is logon using your user id from any other computer. Multiple
logons of users must be set to 1 in sap production systems. This can be allowed
in DEV systems. But in production it must be restricted.
Go to rz10 and change the paramenter
login/multi_login_users. By default the value is 0 which is inactive. If you want to activate mupltiple logons for some users in sap like service users you have to change the parameter
login/disable_multi_gui_login = you have to enter the user names in the values seperated by semi colon ; and dont leave spaces between the userids. Now you have to restart the instance.
Go to rz10 and change the paramenter
login/multi_login_users. By default the value is 0 which is inactive. If you want to activate mupltiple logons for some users in sap like service users you have to change the parameter
login/disable_multi_gui_login = you have to enter the user names in the values seperated by semi colon ; and dont leave spaces between the userids. Now you have to restart the instance.
To deleted scheduled jobs in SAP you need to go to Tcode
SM37. Now you select the jobs that you want to delete. Click on the check
button left side of each job name and now in the menu go to job->delete.
Precaution must be taken when dealing with dependent jobs. If the completion of job1 starts the job2 and if you delete job1 then job2 will not start.
When deleting the jobs the system will inform you of any such dependent jobs and you need to reschedule them to start again
Precaution must be taken when dealing with dependent jobs. If the completion of job1 starts the job2 and if you delete job1 then job2 will not start.
When deleting the jobs the system will inform you of any such dependent jobs and you need to reschedule them to start again
What are the maximum no of sessions per user in SAP?
This is the maximum no of windows which you can open in SAP for that system.
By default the value is 6. So a user can open 6 sessions in 4.7x.
You set this values in rdisp/max_alt_modes parameter.
You can change this parameter using RZ10 in instance profile and use extended maintenance for changing this.
Mos of the companies restrict this no of sessions since they can cause unecessary load..
This is the maximum no of windows which you can open in SAP for that system.
By default the value is 6. So a user can open 6 sessions in 4.7x.
You set this values in rdisp/max_alt_modes parameter.
You can change this parameter using RZ10 in instance profile and use extended maintenance for changing this.
Mos of the companies restrict this no of sessions since they can cause unecessary load..
Friday, July 25, 2008
what is saposcol?
A)SAPOSCOL is SAP Operating System Collector
is a standalone program that runs in background at OS level. It
collects information about operatin system resource usage like
A)SAPOSCOL is SAP Operating System Collector
is a standalone program that runs in background at OS level. It
collects information about operatin system resource usage like
· CPU
Utilization
· Main
Memory and Virtual Memory utilization.
· Physical
Disk and File System utilization.
· Resource
usage by running processes.
How many instances of SAPOSCOL to be run?
A)Only
one instance of SAPOSCOL needed to be run per hardware. Even if there
are multiple instances running on a single hardware only one SAPOSCOL
process is needed.
What is the frequency of data collection by SAPOSCOL?
A) Data is collected every ten seconds.
Where is the data collected by SAPOSCOL stored?
A)The data is stored in shared memory and for long & future usage data is stored in tables MONI & OSMON.
Tha data collected by SAPOSCOL copied to tables MONI & OSMON by background job COLLECTOR_FOR_PERFMONITOR
What are the SAP level tcodes to view this data?
A) At SAP level you can view the information collected by SAPOSCOL using tcodes/transactions ST06, OS06 & OS07.
A)Only
one instance of SAPOSCOL needed to be run per hardware. Even if there
are multiple instances running on a single hardware only one SAPOSCOL
process is needed.
What is the frequency of data collection by SAPOSCOL?
A) Data is collected every ten seconds.
Where is the data collected by SAPOSCOL stored?
A)The data is stored in shared memory and for long & future usage data is stored in tables MONI & OSMON.
Tha data collected by SAPOSCOL copied to tables MONI & OSMON by background job COLLECTOR_FOR_PERFMONITOR
What are the SAP level tcodes to view this data?
A) At SAP level you can view the information collected by SAPOSCOL using tcodes/transactions ST06, OS06 & OS07.
Heap Memory stores User Context when Extended Memory
allocated to a work process gets exhausted and the work process requires more
space to continue. Heap Memory stores contains same type of Data as Extended
Memory. Heap Memory is allocated dynamically according to requirement and not
during system startup. When the workprocess starts using heap area it enters in
to PRIV mode.
These are important categories of system parameters. You
can access and change them using RZ11.
to
display you can use report RSPFPAR which can be run thorough SA38. Not
all parameters can be changed.Using RZ10 (profile maintainance)
you can change parameters that are dynamically switchable and they are
activated immediately.
to
display you can use report RSPFPAR which can be run thorough SA38. Not
all parameters can be changed.Using RZ10 (profile maintainance)
you can change parameters that are dynamically switchable and they are
activated immediately.
· ES/*
: Related to extended memory settings
· INSTANCE*
: Identify an instance or server
· ABAP/*
: Related to program execution, including heap settings
· AUTH/*
: Related to authorization
· DBS/
· EM/*
: General system related settings
· ENQUE/*
: Settings for the enqueue WP (or standalone ENQ server)
· GW/*
: SAP Gateway related settings
· ICF/*
& ICM/* : Settings for the Internet control framework and ICM
· LOGIN/*
: Controls the logon environment (such a multiple sessions etc)
· MS/*
: Message server related settings
· RDISP/*
: Controls the dispatcher & dispatcher controlled processes
· STAT/*
: Statistics collector related parameters
· SCSA/*
: Shared common system area parameters
· ZTTA/*
: Extended memory related parameters
Tcode SM50.
Sm50
tcode is used to see the workprocess overview in application
server you are logged in.
There are several fields diplayed in the work
process overview screen.
Each of the field value is described in below
table.
Menu path for this tcode is
Tools --> Administration--> Monitor -->System monitoring --> Process --> overview
Sm50
tcode is used to see the workprocess overview in application
server you are logged in.
There are several fields diplayed in the work
process overview screen.
Each of the field value is described in below
table.
Menu path for this tcode is
Tools --> Administration--> Monitor -->System monitoring --> Process --> overview
|
No
|
This is the work process
number and is unique to each work process.
|
|
Type
|
This denotes the type of work
process.
These are the possible values for type field DIA: Dialog UPD: Update BGD: Background ENQ: Enqueue SPO: Spool |
|
PID
|
Process ID which is a unique
no to identify the process at os level.
|
|
Status
|
This shows the status of work
process like PRIV mode etc..
|
|
Ended
|
Work process has been
terminated because of some error in SAP kernel.
Running – work process is busy processing user request. Waiting – work process is ready to accept user request. PRIV – Work process running with heap memory (noramally basis admins terminate the dia wp if it enters priv mode). |
|
Completed
|
The work process has been
terminated and they can not be restarted.
|
|
Reason
|
If a work process status is
stopped, this field gives the reason why it is stopped.
|
|
Start
|
This field tells if the
dispatcher can restart the work process if it gets terminated.
|
|
Err
|
Err field gives the no
of times the work process .
|
|
Sem
|
Number of semaphore.
With Green background =>Process is holding the semaphore. With Red background => Process is waiting for the semaphore. |
|
CPU
|
The CPU Time utilization by
each work process format minutes:seconds
|
|
Time
|
The time that has been
consumed processing the current request (in seconds).
|
|
Report
|
The name of report which is
being executed
|
|
Clie
|
Client No.
|
|
User
|
Name of user whose request is
currently being executed.
|
|
Action
|
For the work process with
status “running”, this displays the current action.
|
|
Table
|
The DB tables that
is accessed previously by work process.
|
Instance Profile Parameters Related to Memory
|
abap/heaplimit
|
Work Process
Restart |
|
ztta/roll_extension
|
Limit for Extended Memory
|
|
ztta/roll_extension_dia
|
EM Quota for Dialog Work
Processes
|
|
ztta/roll_extension_nondia
|
EM Quota for Non-Dialog Work
Processes |
|
abap/heap_area_dia
|
Heap Memory Limit for Dialog
Work
Processes |
|
abap/heap_area_nondia
|
Heap Memory Limit for
Non-Dialog
Work Processes |
|
abap/heap_area_total
|
Total Quota for Heap Memory
|
|
ztta/roll_area
|
Size of Roll Area Roll Area
|
|
ztta/roll_first
|
Size of the Initial
Allocation
from the Roll Area |
|
abap/heap_area_total
|
Heap Memory Limit
|
|
em/initial_size_MB
|
Extended Memory Pool Size
|
|
rdisp/ROLL_SHM
|
Roll Buffer Size
|
|
rdisp/ROLL_MAXFS
|
Maximum Roll File Size
|
|
rdisp/PG_SHM
|
Size of the Paging Buffer
|
|
rdisp/PG_MAXFS
|
Maximum Size of SAP Paging
File
|
|
em/blocksize_KB
|
Segment Size for the Extended
Memory Memory Management Statistics |
|
em/stat_log_size_MB
|
Statistics - User Context
Size
|
|
em/stat_log_timeout
|
Statistics - User Context Size
|
Using the operation modes, you can adjust the type and
distribution of the
work processes to the varying load distribution during the day. You can
also adjust the distribution of the work processes to business
requirements that only occur once. During the day the demand for dialog
work process is high an system response for dialog work process must be
fast. At night there are less users so system resources are not
utilized fully if a major percent of them is reserved for dialog work
process. By defining operation modes, you can change not only the total
number of work processes defined in the profiles, but also the type and
distribution of the individual work process types within this total
number. The switch between the work process types is performed
dynamically during the runtime of the SAP system. The switch is
triggered using a defined schedule. A reserved work process is not
immediately terminated, but marked for switching. This means that
certain delays may occur. This type change is logged in the system log.
During the switch of the operation modes, neither the instance nor the
affected work processes need to be restarted. This means that the
quality of the buffer of the SAP system is retained during an operation
mode switch ,and that the request that is currently being processed by
a work process is completed. The individual work processes retain their
process ID after the switch, which can be observed in the process
overview (SM50).You can trigger an operation mode switch from a program
that you have written yourself using a function module (RZL_PERFORM_BA_SWITCH)
work processes to the varying load distribution during the day. You can
also adjust the distribution of the work processes to business
requirements that only occur once. During the day the demand for dialog
work process is high an system response for dialog work process must be
fast. At night there are less users so system resources are not
utilized fully if a major percent of them is reserved for dialog work
process. By defining operation modes, you can change not only the total
number of work processes defined in the profiles, but also the type and
distribution of the individual work process types within this total
number. The switch between the work process types is performed
dynamically during the runtime of the SAP system. The switch is
triggered using a defined schedule. A reserved work process is not
immediately terminated, but marked for switching. This means that
certain delays may occur. This type change is logged in the system log.
During the switch of the operation modes, neither the instance nor the
affected work processes need to be restarted. This means that the
quality of the buffer of the SAP system is retained during an operation
mode switch ,and that the request that is currently being processed by
a work process is completed. The individual work processes retain their
process ID after the switch, which can be observed in the process
overview (SM50).You can trigger an operation mode switch from a program
that you have written yourself using a function module (RZL_PERFORM_BA_SWITCH)
Memory allocation of non-dialog work process in UNIX
In UNIX, if Roll memory gets full Heap memory is occupied and if heap memory gets full extended memory is used.
But
in windows it is different, after roll memory (ztta/roll_first) is
filled the work process uses Extended memory, after extended memory is
fill then remainder of roll memory ( ztta/roll_area - ztta/roll_first)
is used soon..
In UNIX, if Roll memory gets full Heap memory is occupied and if heap memory gets full extended memory is used.
But
in windows it is different, after roll memory (ztta/roll_first) is
filled the work process uses Extended memory, after extended memory is
fill then remainder of roll memory ( ztta/roll_area - ztta/roll_first)
is used soon..
|
Unix
or Unix like systems
|
Windows
|
|
Roll
Memory
up to ztta/roll_area |
Roll
Memory
up to ztta/roll_first |
|
|
| \|/ |
|
| \|/ |
|
Heap
Memory
up to abap/heap_area_nondia or HM Exhaust |
Extended
Memory
up to ztta/roll_extension or EM Exhaust |
|
|
| \|/ |
|
| \|/ |
|
Extended
Memory
up to ztta/roll_extension or EM Exhaust |
Roll
Memory
Remainder of ztta/roll_area |
|
|
| \|/ |
|
|
Heap
Memory
up to abap/heap_area_dia or HM Exhaust |
What is dispatcher?
A) Dispatcher is tha central workprocess in an application server which along with operating system manages the resources for ABAP applications.
What does the dispatcher does?
A) The dispatcher distributes the transaction load among various work process, connecting to the presentation level and organizing communication. The processing requests are first saved in request queues and then processed according to 'first in -- first out' rule.
Does Dispatcher process data?
A) No, the data is processed in work process like dialog wp or background wp or update wp etc.. The dispatcher only distributes load between work process. There is no assignment of a work process to single user. The requests which are created by user using SAPGUI is distributed among the work process. Processing user requests sometimes requires data to be read from the database or written to it. For this, every work process is connected directly to the database.
A) Dispatcher is tha central workprocess in an application server which along with operating system manages the resources for ABAP applications.
What does the dispatcher does?
A) The dispatcher distributes the transaction load among various work process, connecting to the presentation level and organizing communication. The processing requests are first saved in request queues and then processed according to 'first in -- first out' rule.
Does Dispatcher process data?
A) No, the data is processed in work process like dialog wp or background wp or update wp etc.. The dispatcher only distributes load between work process. There is no assignment of a work process to single user. The requests which are created by user using SAPGUI is distributed among the work process. Processing user requests sometimes requires data to be read from the database or written to it. For this, every work process is connected directly to the database.
One can check the status of a background job in tcode sm37
(job overview). You can see the job status of all jobs of a userid by entering
the userid in the job selection screen or you can see the status of jobs by
selecting naming convention. you will have options in the sm37 screen to select
jobs by their status.
There are 6 status for background jobs
· Scheduled - The job has been created, but it has not yet been
assigned a starting time.
· Released - The job has been created and it has been assigned
a starting time.
· Ready - The job is ready to be processed.
· Active - The job is being processed.
· Finished - The job has finished successfully.
· Cancelled - The job did not finish successfully.
memory allocation for dialog work process
This is the order in
which the memory space is used. If Roll memory is filled then the
memory in Extended memory is used and soon as shown below. The memory
allocation sequence is same in windows & unix.
This is the order in
which the memory space is used. If Roll memory is filled then the
memory in Extended memory is used and soon as shown below. The memory
allocation sequence is same in windows & unix.
|
Roll Memory
(Max size) ztta/roll_first |
------->
|
Extended Memory up to
ztta/roll_extension or EM Exhaust |
-----------+ | \|/ |
|
Roll Memory Remainder of
ztta/roll_area |
|||
|
|
\|/ |
|||
|
Heap Memory up to
abap/heap_area_dia or HM Exhaust |
|
ztta/roll_first
|
maximum size of Roll memory
|
|
ztta/roll_extension
|
max size of extended memory
|
|
ztta/roll_area
|
max size of local roll
area
|
|
abap/heap_area_dia
|
max size of heap memory
|
Sunday, July 13, 2008
why does lock table overflow?
There are many reasons why lock table overflows.
when you try to lock a object or change a object you will see a system message
"lock table overflow", there are amny reasons this will occur.
for example
There are many reasons why lock table overflows.
when you try to lock a object or change a object you will see a system message
"lock table overflow", there are amny reasons this will occur.
for example
· small
size of lock table
· a
particular program sets a large no of locks
· an
update process hangs hence setting a large number of locks
above reasons are only a few of the reasons why the lock
overflow occurs.
Sunday, July 6, 2008
The lock table is a table in the main memory of the
enqueue server that records the current locks in the system. For each
elementary lock, the table specifies the owner, lock mode, name, and the fields
in the locked table. There is a limit to how many locks can be done in the
system. The maximum number of locks in the lock table is subject to an upper
limit, which can be defined in a profile parameter "enque/table_size"
determines the size of the lock table in KB.
Wednesday, April 2, 2008
In ST02,
1) Hit ratio for each buffer should be greater than 95%.
2) If hit ratio is less than 95%, no swap should be there.
3) Current usage of extended memory should not cross 75%.
4) We have to check the swaps for each buffer. For program buffers it should be 10000 hits/ day & for other buffers it should be 1000 hits/ day.
5) We have to check the free space & the free directory for each buffer.
In ST06/ST06N,
1) Ideally CPU should be free for 60% of the time.
2) Page out/s should be 0.
3) Under LAN, we have to check for collisions & errors. They should be 0.
4) We have to check for the SAPOSCOL status.
NOTE: These are very generic guidelines and may not hold appropriate for all kinds of SAP Systems. For example, on production systems, we expect better performance then other systems or Sandbox systems may experience more buffer problems. With a bit of variation, these will hold correct for most of SAP Systems.
1) Hit ratio for each buffer should be greater than 95%.
2) If hit ratio is less than 95%, no swap should be there.
3) Current usage of extended memory should not cross 75%.
4) We have to check the swaps for each buffer. For program buffers it should be 10000 hits/ day & for other buffers it should be 1000 hits/ day.
5) We have to check the free space & the free directory for each buffer.
In ST06/ST06N,
1) Ideally CPU should be free for 60% of the time.
2) Page out/s should be 0.
3) Under LAN, we have to check for collisions & errors. They should be 0.
4) We have to check for the SAPOSCOL status.
NOTE: These are very generic guidelines and may not hold appropriate for all kinds of SAP Systems. For example, on production systems, we expect better performance then other systems or Sandbox systems may experience more buffer problems. With a bit of variation, these will hold correct for most of SAP Systems.
Monday, December 31, 2007
External commands are predefined commands for end
users. They are operating-system independent and are protected by
authorizations, so that normal end users can schedule only those commands that
the system administrator permits them to.Like ls in unix
or dir in windows. Refer to this post for
information on how to run a external command
External programs are unrestricted commands that are neither pre-defined nor restricted by authorizations. A user with administrator authorization can enter any of these in a job step. For example , programs like java or other exe files
External programs are unrestricted commands that are neither pre-defined nor restricted by authorizations. A user with administrator authorization can enter any of these in a job step. For example , programs like java or other exe files
Thursday, December 27, 2007
To view locked users in sap
1) Call transaction su10
Click on authorization data and scroll down
check the locked users only field as shown in figure and execute (F8).
2) Call transaction sa38 and run the program RSUSR006 . You will get a list of locked users.
3) Goto transaction ewz5 you will get users with locked status
4) Run report EWULKUSR in transaction sa38 to get the list.
5) Call transaction SUIM , goto
a) authorizations > User > User by complex search criteria >List of User Master
Records Locked Due to Incorrect Logon
or
b) user > unsuccessful logons
6) Call transaction S_BCE_68001402
1) Call transaction su10
Click on authorization data and scroll down
check the locked users only field as shown in figure and execute (F8).
2) Call transaction sa38 and run the program RSUSR006 . You will get a list of locked users.
3) Goto transaction ewz5 you will get users with locked status
4) Run report EWULKUSR in transaction sa38 to get the list.
5) Call transaction SUIM , goto
a) authorizations > User > User by complex search criteria >List of User Master
Records Locked Due to Incorrect Logon
or
b) user > unsuccessful logons
6) Call transaction S_BCE_68001402
Sunday, January 11, 2009
There are many ways through which you can get the Version
Number of SAP Kernel.
One of the method is from any window in the top menu go to
system--> status and click on the other kernel info button which is between the navigate and cancel buttons.
Another method is to login as administrator and enter the following disp+work -v. in command field on left top corner. This will show you the kernel version of SAP.
You can also check the log or trace files at os level /usr/sap/work/dev_disp.
You can also get this kernel information from sm51 screen. Go to transaction sm51 then click on database server (single click only. Not double click) and then click on release notes. Then you will see the kernel information and patch level.
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One of the method is from any window in the top menu go to
system--> status and click on the other kernel info button which is between the navigate and cancel buttons.
Another method is to login as administrator and enter the following disp+work -v. in command field on left top corner. This will show you the kernel version of SAP.
You can also check the log or trace files at os level /usr/sap/work/dev_disp.
You can also get this kernel information from sm51 screen. Go to transaction sm51 then click on database server (single click only. Not double click) and then click on release notes. Then you will see the kernel information and patch level.
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This is a critical and security feature. You can know
whether some one is logon using your user id from any other computer. Multiple
logons of users must be set to 1 in sap production systems. This can be allowed
in DEV systems. But in production it must be restricted.
Go to rz10 and change the paramenter
login/multi_login_users. By default the value is 0 which is inactive. If you want to activate mupltiple logons for some users in sap like service users you have to change the parameter
login/disable_multi_gui_login = you have to enter the user names in the values seperated by semi colon ; and dont leave spaces between the userids. Now you have to restart the instance.
Go to rz10 and change the paramenter
login/multi_login_users. By default the value is 0 which is inactive. If you want to activate mupltiple logons for some users in sap like service users you have to change the parameter
login/disable_multi_gui_login = you have to enter the user names in the values seperated by semi colon ; and dont leave spaces between the userids. Now you have to restart the instance.
To deleted scheduled jobs in SAP you need to go to Tcode
SM37. Now you select the jobs that you want to delete. Click on the check
button left side of each job name and now in the menu go to job->delete.
Precaution must be taken when dealing with dependent jobs. If the completion of job1 starts the job2 and if you delete job1 then job2 will not start.
When deleting the jobs the system will inform you of any such dependent jobs and you need to reschedule them to start again
Precaution must be taken when dealing with dependent jobs. If the completion of job1 starts the job2 and if you delete job1 then job2 will not start.
When deleting the jobs the system will inform you of any such dependent jobs and you need to reschedule them to start again
What are the maximum no of sessions per user in SAP?
This is the maximum no of windows which you can open in SAP for that system.
By default the value is 6. So a user can open 6 sessions in 4.7x.
You set this values in rdisp/max_alt_modes parameter.
You can change this parameter using RZ10 in instance profile and use extended maintenance for changing this.
Mos of the companies restrict this no of sessions since they can cause unecessary load..
This is the maximum no of windows which you can open in SAP for that system.
By default the value is 6. So a user can open 6 sessions in 4.7x.
You set this values in rdisp/max_alt_modes parameter.
You can change this parameter using RZ10 in instance profile and use extended maintenance for changing this.
Mos of the companies restrict this no of sessions since they can cause unecessary load..
Friday, July 25, 2008
what is saposcol?
A)SAPOSCOL is SAP Operating System Collector
is a standalone program that runs in background at OS level. It
collects information about operatin system resource usage like
A)SAPOSCOL is SAP Operating System Collector
is a standalone program that runs in background at OS level. It
collects information about operatin system resource usage like
· CPU
Utilization
· Main
Memory and Virtual Memory utilization.
· Physical
Disk and File System utilization.
· Resource
usage by running processes.
How many instances of SAPOSCOL to be run?
A)Only
one instance of SAPOSCOL needed to be run per hardware. Even if there
are multiple instances running on a single hardware only one SAPOSCOL
process is needed.
What is the frequency of data collection by SAPOSCOL?
A) Data is collected every ten seconds.
Where is the data collected by SAPOSCOL stored?
A)The data is stored in shared memory and for long & future usage data is stored in tables MONI & OSMON.
Tha data collected by SAPOSCOL copied to tables MONI & OSMON by background job COLLECTOR_FOR_PERFMONITOR
What are the SAP level tcodes to view this data?
A) At SAP level you can view the information collected by SAPOSCOL using tcodes/transactions ST06, OS06 & OS07.
A)Only
one instance of SAPOSCOL needed to be run per hardware. Even if there
are multiple instances running on a single hardware only one SAPOSCOL
process is needed.
What is the frequency of data collection by SAPOSCOL?
A) Data is collected every ten seconds.
Where is the data collected by SAPOSCOL stored?
A)The data is stored in shared memory and for long & future usage data is stored in tables MONI & OSMON.
Tha data collected by SAPOSCOL copied to tables MONI & OSMON by background job COLLECTOR_FOR_PERFMONITOR
What are the SAP level tcodes to view this data?
A) At SAP level you can view the information collected by SAPOSCOL using tcodes/transactions ST06, OS06 & OS07.
Heap Memory stores User Context when Extended Memory allocated
to a work process gets exhausted and the work process requires more space to
continue. Heap Memory stores contains same type of Data as Extended Memory.
Heap Memory is allocated dynamically according to requirement and not during
system startup. When the workprocess starts using heap area it enters in to
PRIV mode.
These are important categories of system parameters. You
can access and change them using RZ11.
to
display you can use report RSPFPAR which can be run thorough SA38. Not
all parameters can be changed.Using RZ10 (profile maintainance)
you can change parameters that are dynamically switchable and they are
activated immediately.
to
display you can use report RSPFPAR which can be run thorough SA38. Not
all parameters can be changed.Using RZ10 (profile maintainance)
you can change parameters that are dynamically switchable and they are
activated immediately.
· ES/*
: Related to extended memory settings
· INSTANCE*
: Identify an instance or server
· ABAP/*
: Related to program execution, including heap settings
· AUTH/*
: Related to authorization
· DBS/
· EM/*
: General system related settings
· ENQUE/*
: Settings for the enqueue WP (or standalone ENQ server)
· GW/*
: SAP Gateway related settings
· ICF/*
& ICM/* : Settings for the Internet control framework and ICM
· LOGIN/*
: Controls the logon environment (such a multiple sessions etc)
· MS/*
: Message server related settings
· RDISP/*
: Controls the dispatcher & dispatcher controlled processes
· STAT/*
: Statistics collector related parameters
· SCSA/*
: Shared common system area parameters
· ZTTA/*
: Extended memory related parameters
Tcode SM50.
Sm50
tcode is used to see the workprocess overview in application
server you are logged in.
There are several fields diplayed in the work
process overview screen.
Each of the field value is described in below
table.
Menu path for this tcode is
Tools --> Administration--> Monitor -->System monitoring --> Process --> overview
Sm50
tcode is used to see the workprocess overview in application
server you are logged in.
There are several fields diplayed in the work
process overview screen.
Each of the field value is described in below
table.
Menu path for this tcode is
Tools --> Administration--> Monitor -->System monitoring --> Process --> overview
|
No
|
This is the work process
number and is unique to each work process.
|
|
Type
|
This denotes the type of work
process.
These are the possible values for type field DIA: Dialog UPD: Update BGD: Background ENQ: Enqueue SPO: Spool |
|
PID
|
Process ID which is a unique
no to identify the process at os level.
|
|
Status
|
This shows the status of work
process like PRIV mode etc..
|
|
Ended
|
Work process has been
terminated because of some error in SAP kernel.
Running – work process is busy processing user request. Waiting – work process is ready to accept user request. PRIV – Work process running with heap memory (noramally basis admins terminate the dia wp if it enters priv mode). |
|
Completed
|
The work process has been
terminated and they can not be restarted.
|
|
Reason
|
If a work process status is
stopped, this field gives the reason why it is stopped.
|
|
Start
|
This field tells if the
dispatcher can restart the work process if it gets terminated.
|
|
Err
|
Err field gives the no
of times the work process .
|
|
Sem
|
Number of semaphore.
With Green background =>Process is holding the semaphore. With Red background => Process is waiting for the semaphore. |
|
CPU
|
The CPU Time utilization by
each work process format minutes:seconds
|
|
Time
|
The time that has been
consumed processing the current request (in seconds).
|
|
Report
|
The name of report which is
being executed
|
|
Clie
|
Client No.
|
|
User
|
Name of user whose request is
currently being executed.
|
|
Action
|
For the work process with
status “running”, this displays the current action.
|
|
Table
|
The DB tables that
is accessed previously by work process.
|
Instance Profile Parameters Related to Memory
|
abap/heaplimit
|
Work Process
Restart |
|
ztta/roll_extension
|
Limit for Extended Memory
|
|
ztta/roll_extension_dia
|
EM Quota for Dialog Work
Processes
|
|
ztta/roll_extension_nondia
|
EM Quota for Non-Dialog Work
Processes |
|
abap/heap_area_dia
|
Heap Memory Limit for Dialog
Work
Processes |
|
abap/heap_area_nondia
|
Heap Memory Limit for
Non-Dialog
Work Processes |
|
abap/heap_area_total
|
Total Quota for Heap Memory
|
|
ztta/roll_area
|
Size of Roll Area Roll Area
|
|
ztta/roll_first
|
Size of the Initial
Allocation
from the Roll Area |
|
abap/heap_area_total
|
Heap Memory Limit
|
|
em/initial_size_MB
|
Extended Memory Pool Size
|
|
rdisp/ROLL_SHM
|
Roll Buffer Size
|
|
rdisp/ROLL_MAXFS
|
Maximum Roll File Size
|
|
rdisp/PG_SHM
|
Size of the Paging Buffer
|
|
rdisp/PG_MAXFS
|
Maximum Size of SAP Paging
File
|
|
em/blocksize_KB
|
Segment Size for the Extended
Memory Memory Management Statistics |
|
em/stat_log_size_MB
|
Statistics - User Context
Size
|
|
em/stat_log_timeout
|
Statistics - User Context
Size
|
Using the operation modes, you can adjust the type and
distribution of the
work processes to the varying load distribution during the day. You can
also adjust the distribution of the work processes to business
requirements that only occur once. During the day the demand for dialog
work process is high an system response for dialog work process must be
fast. At night there are less users so system resources are not
utilized fully if a major percent of them is reserved for dialog work
process. By defining operation modes, you can change not only the total
number of work processes defined in the profiles, but also the type and
distribution of the individual work process types within this total
number. The switch between the work process types is performed
dynamically during the runtime of the SAP system. The switch is
triggered using a defined schedule. A reserved work process is not
immediately terminated, but marked for switching. This means that
certain delays may occur. This type change is logged in the system log.
During the switch of the operation modes, neither the instance nor the
affected work processes need to be restarted. This means that the
quality of the buffer of the SAP system is retained during an operation
mode switch ,and that the request that is currently being processed by
a work process is completed. The individual work processes retain their
process ID after the switch, which can be observed in the process
overview (SM50).You can trigger an operation mode switch from a program
that you have written yourself using a function module (RZL_PERFORM_BA_SWITCH)
work processes to the varying load distribution during the day. You can
also adjust the distribution of the work processes to business
requirements that only occur once. During the day the demand for dialog
work process is high an system response for dialog work process must be
fast. At night there are less users so system resources are not
utilized fully if a major percent of them is reserved for dialog work
process. By defining operation modes, you can change not only the total
number of work processes defined in the profiles, but also the type and
distribution of the individual work process types within this total
number. The switch between the work process types is performed
dynamically during the runtime of the SAP system. The switch is
triggered using a defined schedule. A reserved work process is not
immediately terminated, but marked for switching. This means that
certain delays may occur. This type change is logged in the system log.
During the switch of the operation modes, neither the instance nor the
affected work processes need to be restarted. This means that the
quality of the buffer of the SAP system is retained during an operation
mode switch ,and that the request that is currently being processed by
a work process is completed. The individual work processes retain their
process ID after the switch, which can be observed in the process
overview (SM50).You can trigger an operation mode switch from a program
that you have written yourself using a function module (RZL_PERFORM_BA_SWITCH)
Memory allocation of non-dialog work process in UNIX
In UNIX, if Roll memory gets full Heap memory is occupied and if heap memory gets full extended memory is used.
But
in windows it is different, after roll memory (ztta/roll_first) is
filled the work process uses Extended memory, after extended memory is
fill then remainder of roll memory ( ztta/roll_area - ztta/roll_first)
is used soon..
In UNIX, if Roll memory gets full Heap memory is occupied and if heap memory gets full extended memory is used.
But
in windows it is different, after roll memory (ztta/roll_first) is
filled the work process uses Extended memory, after extended memory is
fill then remainder of roll memory ( ztta/roll_area - ztta/roll_first)
is used soon..
|
Unix
or Unix like systems
|
Windows
|
|
Roll
Memory
up to ztta/roll_area |
Roll
Memory
up to ztta/roll_first |
|
|
| \|/ |
|
| \|/ |
|
Heap
Memory
up to abap/heap_area_nondia or HM Exhaust |
Extended
Memory
up to ztta/roll_extension or EM Exhaust |
|
|
| \|/ |
|
| \|/ |
|
Extended
Memory
up to ztta/roll_extension or EM Exhaust |
Roll
Memory
Remainder of ztta/roll_area |
|
|
| \|/ |
|
|
Heap
Memory
up to abap/heap_area_dia or HM Exhaust |
What is dispatcher?
A) Dispatcher is tha central workprocess in an application server which along with operating system manages the resources for ABAP applications.
What does the dispatcher does?
A) The dispatcher distributes the transaction load among various work process, connecting to the presentation level and organizing communication. The processing requests are first saved in request queues and then processed according to 'first in -- first out' rule.
Does Dispatcher process data?
A) No, the data is processed in work process like dialog wp or background wp or update wp etc.. The dispatcher only distributes load between work process. There is no assignment of a work process to single user. The requests which are created by user using SAPGUI is distributed among the work process. Processing user requests sometimes requires data to be read from the database or written to it. For this, every work process is connected directly to the database.
A) Dispatcher is tha central workprocess in an application server which along with operating system manages the resources for ABAP applications.
What does the dispatcher does?
A) The dispatcher distributes the transaction load among various work process, connecting to the presentation level and organizing communication. The processing requests are first saved in request queues and then processed according to 'first in -- first out' rule.
Does Dispatcher process data?
A) No, the data is processed in work process like dialog wp or background wp or update wp etc.. The dispatcher only distributes load between work process. There is no assignment of a work process to single user. The requests which are created by user using SAPGUI is distributed among the work process. Processing user requests sometimes requires data to be read from the database or written to it. For this, every work process is connected directly to the database.
One can check the status of a background job in tcode sm37
(job overview). You can see the job status of all jobs of a userid by entering
the userid in the job selection screen or you can see the status of jobs by
selecting naming convention. you will have options in the sm37 screen to select
jobs by their status.
There are 6 status for background jobs
· Scheduled - The job has been created, but it has not yet been
assigned a starting time.
· Released - The job has been created and it has been assigned
a starting time.
· Ready - The job is ready to be processed.
· Active - The job is being processed.
· Finished - The job has finished successfully.
· Cancelled - The job did not finish successfully.
memory allocation for dialog work process
This is the order in
which the memory space is used. If Roll memory is filled then the
memory in Extended memory is used and soon as shown below. The memory
allocation sequence is same in windows & unix.
This is the order in
which the memory space is used. If Roll memory is filled then the
memory in Extended memory is used and soon as shown below. The memory
allocation sequence is same in windows & unix.
|
Roll Memory
(Max size) ztta/roll_first |
------->
|
Extended Memory up to
ztta/roll_extension or EM Exhaust |
-----------+ | \|/ |
|
Roll Memory Remainder of
ztta/roll_area |
|||
|
|
\|/ |
|||
|
Heap Memory up to
abap/heap_area_dia or HM Exhaust |
|
ztta/roll_first
|
maximum size of Roll memory
|
|
ztta/roll_extension
|
max size of extended memory
|
|
ztta/roll_area
|
max size of local roll
area
|
|
abap/heap_area_dia
|
max size of heap memory
|
Sunday, July 13, 2008
why does lock table overflow?
There are many reasons why lock table overflows.
when you try to lock a object or change a object you will see a system message
"lock table overflow", there are amny reasons this will occur.
for example
There are many reasons why lock table overflows.
when you try to lock a object or change a object you will see a system message
"lock table overflow", there are amny reasons this will occur.
for example
· small
size of lock table
· a
particular program sets a large no of locks
· an
update process hangs hence setting a large number of locks
above reasons are only a few of the reasons why the lock
overflow occurs.
Sunday, July 6, 2008
The lock table is a table in the main memory of the
enqueue server that records the current locks in the system. For each
elementary lock, the table specifies the owner, lock mode, name, and the fields
in the locked table. There is a limit to how many locks can be done in the
system. The maximum number of locks in the lock table is subject to an upper
limit, which can be defined in a profile parameter "enque/table_size"
determines the size of the lock table in KB.
Wednesday, April 2, 2008
In ST02,
1) Hit ratio for each buffer should be greater than 95%.
2) If hit ratio is less than 95%, no swap should be there.
3) Current usage of extended memory should not cross 75%.
4) We have to check the swaps for each buffer. For program buffers it should be 10000 hits/ day & for other buffers it should be 1000 hits/ day.
5) We have to check the free space & the free directory for each buffer.
In ST06/ST06N,
1) Ideally CPU should be free for 60% of the time.
2) Page out/s should be 0.
3) Under LAN, we have to check for collisions & errors. They should be 0.
4) We have to check for the SAPOSCOL status.
NOTE: These are very generic guidelines and may not hold appropriate for all kinds of SAP Systems. For example, on production systems, we expect better performance then other systems or Sandbox systems may experience more buffer problems. With a bit of variation, these will hold correct for most of SAP Systems.
1) Hit ratio for each buffer should be greater than 95%.
2) If hit ratio is less than 95%, no swap should be there.
3) Current usage of extended memory should not cross 75%.
4) We have to check the swaps for each buffer. For program buffers it should be 10000 hits/ day & for other buffers it should be 1000 hits/ day.
5) We have to check the free space & the free directory for each buffer.
In ST06/ST06N,
1) Ideally CPU should be free for 60% of the time.
2) Page out/s should be 0.
3) Under LAN, we have to check for collisions & errors. They should be 0.
4) We have to check for the SAPOSCOL status.
NOTE: These are very generic guidelines and may not hold appropriate for all kinds of SAP Systems. For example, on production systems, we expect better performance then other systems or Sandbox systems may experience more buffer problems. With a bit of variation, these will hold correct for most of SAP Systems.
Monday, December 31, 2007
External commands are predefined commands for end
users. They are operating-system independent and are protected by
authorizations, so that normal end users can schedule only those commands that
the system administrator permits them to.Like ls in unix
or dir in windows. Refer to this post for
information on how to run a external command
External programs are unrestricted commands that are neither pre-defined nor restricted by authorizations. A user with administrator authorization can enter any of these in a job step. For example , programs like java or other exe files
External programs are unrestricted commands that are neither pre-defined nor restricted by authorizations. A user with administrator authorization can enter any of these in a job step. For example , programs like java or other exe files
Thursday, December 27, 2007
To view locked users in sap
1) Call transaction su10
Click on authorization data and scroll down
check the locked users only field as shown in figure and execute (F8).
2) Call transaction sa38 and run the program RSUSR006 . You will get a list of locked users.
3) Goto transaction ewz5 you will get users with locked status
4) Run report EWULKUSR in transaction sa38 to get the list.
5) Call transaction SUIM , goto
a) authorizations > User > User by complex search criteria >List of User Master
Records Locked Due to Incorrect Logon
or
b) user > unsuccessful logons
6) Call transaction S_BCE_68001402
1) Call transaction su10
Click on authorization data and scroll down
check the locked users only field as shown in figure and execute (F8).
2) Call transaction sa38 and run the program RSUSR006 . You will get a list of locked users.
3) Goto transaction ewz5 you will get users with locked status
4) Run report EWULKUSR in transaction sa38 to get the list.
5) Call transaction SUIM , goto
a) authorizations > User > User by complex search criteria >List of User Master
Records Locked Due to Incorrect Logon
or
b) user > unsuccessful logons
6) Call transaction S_BCE_68001402
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