/dev/shm Filled Up With Files In Format JOXSHM_EXT_xxx_SID_xxx
(Doc ID 752899.1)
Last updated on FEBRUARY 22, 2019
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
Checked for relevance on 14-Jun-2017
/dev/shm is being filled up with files in the format JOXSHM_EXT_???_SID_???? and eventually causing the DB to restart. Oracle is not automatically cleaning those files.
Please note that it is OS specific whether such segments are visible on a filesystem or not, and if so where they get placed. eg: On Solaris shm_open() internally creates a file in /tmp with the prefix .SHMD and less the leading "/" from the shm_open argument whereas on Linux it creates an entry in /dev/shm
Most probably the database has not been closed cleanly. i.e SHUTDOWN IMMEDIATE or SHUTDOWN ABORT is used
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