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Martin Klier

usn-it.de

AIX: Avoiding “ORA-27126: unable to lock shared memory segment in core”

Did you ever change lock_sga = true for an Oracle Instance on AIX 5.3, and did see

ORA-27126: unable to lock shared memory segment in core
IBM AIX RISC System/6000 Error: 1: Not owner

in Return?

Do the following:

# vmo -o v_pinshm
v_pinshm = 0
# vmo -o v_pinshm=1
Setting v_pinshm to 1
# lsuser -a capabilities oracle
oracle
# chuser capabilities=CAP_BYPASS_RAC_VMM,CAP_PROPAGATE oracle
# lsuser -a capabilities oracle
oracle capabilities=CAP_BYPASS_RAC_VMM,CAP_PROPAGATE

It should do now.

Regards
Usn

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