OS error EEXIST was thrown when db2start was issued in a single node environment.
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From：http://www-01.ibm.com/support/docview.wss?uid=swg21613865
Technote (FAQ)
Question
After db2start db2diag.log is reporting an OS error EEXIST.
2011-12-14-18.01.38.656079+120 E32782E328 LEVEL: Error (OS)
PID : 26310 TID : 46912685380880PROC : db2star2
INSTANCE: tamdbi02 NODE : 000
FUNCTION: DB2 UDB, SQO Memory Management, sqloMemCreateSingleSegment,
probe:100
CALLED : OS, -, shmget OSERR: EEXIST (17)
Cause
It means that a shared memory identifier exists for a key parameter.
Answer
DB2 is calling shmget when it is started, and that is when the EEXIST is returned by shmget indicating that shared memory exists at the time of the db2start.
That is a result of issuing db2start while the DB2 database server is already or still running.
So maybe db2 was stopped not properly before (IPC ressources left), or started twice (i.e. through autostart and manual).
To remove these messages, you can run the following:
db2stop force
ipclean -a
db2start
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