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PMON (ospid: nnnn): Terminating the Instance Due to Error 495 (Doc ID 2584936.1)

Last updated on APRIL 17, 2023

Applies to:

Oracle Database - Enterprise Edition - Version and later
Information in this document applies to any platform.


Production database terminated twice recently with the following error:
Tue Sep 03 23:27:23 2019
Instance Critical Process (pid: 5, ospid: 25056, GEN0) died unexpectedly
PMON (ospid: 25032): terminating the instance due to error 495
Tue Sep 03 23:27:23 2019
System state dump requested by (instance=1, osid=25032 (PMON)), summary=[abnormal instance termination].
System State dumped to trace file <Path>/<SID>_diag_25062_20190903232723.trc
Tue Sep 03 23:27:27 2019
Dumping diagnostic data in directory=[cdmp_20190903232723], requested by (instance=1, osid=25032 (PMON)), summary=[abnormal instance termination].
Tue Sep 03 23:27:32 2019
Termination issued to instance processes. Waiting for the processes to exit
Instance termination failed to kill one or more processes




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