ORA-4031 Errors Raised On Instance Startup For "PX msg pool" or "CTWR dba buffer" Allocations In The Large Pool

(Doc ID 1265314.1)

Last updated on APRIL 23, 2015

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.1 to 11.2.0.2 [Release 11.2]
Information in this document applies to any platform.
***Checked for relevance on 25-Nov-2013***

Symptoms

Trying to start the instance raises ORA-4031 errors on the large pool , like in:

ORA-04031: unable to allocate 15937368 bytes of shared memory ("large pool","unknown object","large pool","PX msg pool")


Due to this the instance may fail to start.

There may or may not be a current SQL reported in the trace file:

----- Current SQL Statement for this session (sql_id=6mzcys0wut6c9) -----
ALTER DATABASE MOUNT


The call stack will resemble:

... kghnospc <- kghalo <- ksmc_large_pool_all <- kxfpbgtc <- kxfpbgpc <- kxfpbAloPermanent <- kxfpnfy <- kscnfy <- kcfcmb <- kcfmdb ...

Changes

Changes to the following parameters may have affected this:

Cause

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