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ORA-4031 on Large Pool at RMAN backup (Doc ID 1941835.1)

Last updated on AUGUST 04, 2018

Applies to:

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


Running RMAN backup, the alert log reports and ORA-4031 error like below:

'ORA-4031: unable to allocate 2048024 bytes of shared memory ("large pool","unknown object","large pool","PX msg pool")'

The instance has been configured to use Automatic Memory Management (AMM).


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