Scenario 6: Work processes die soon after they start

There's probably nothing worse than not being able to start your SAP system. Where's the problem? The operating system? The database server? Or perhaps it is time to dive into the dark corners of SAP to get some answers? This handy troubleshooting guide by veteran site expert Giovanni Davila will help you figure out what's going on.

Symptoms
  • All work processes die right after the instance is started.
  • The SAP MMC shows work processes with status "ended".
  • Only one work process shows status "wait".
  • An ABAP dump saying "PXA_NO_SHARED_MEMORY" is generated as soon as a user logs in.
  • The SAP MMC Syslog shows the following error multiple times: "SAP-Basis System: Shared Memory for PXA buffer not available".

Problem Analysis
The instance profile contains misconfigured memory-related parameters. Most likely the "abap/buffersize" instance profile parameter is set to high.

Solution
Edit the instance system profile at the OS level under /usr/sap/<SID>/sys/profile and lower the value assigned to "abap/buffersize". Then, restart the instance. Also, it's important to find out if any other memory parameter were changed. If not, the system should start once the adequate memory allocation has been set to the the "abap/buffersize" parameter.


TROUBLESHOOTING SAP STARTUP PROBLEMS

 Home: Introduction
 Scenario 1: Dispatcher does not start due to a port conflict
 Scenario 2: Dispatcher dies due to a database connection problem
 Scenario 3: SAP does not start at all: no message server and no dispatcher
 Scenario 4: Users get 'No logon possible' messages when they attempt to log in
 Scenario 5: The message server starts but the dispatcher doesn't
  Scenario 6: Work processes die soon after they start
 Review: Conclusion and more resources
This was last published in July 2005

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