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ORA-4031 with calls to ksfd_alloc_sgabuffer, ksfd_alloc_contig_buffer, ksfd_get_contig_buffer (Doc ID 367392.1)

Last updated on MAY 19, 2021

Applies to:

Oracle Database - Enterprise Edition - Version 10.1.0.2 and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.

Symptoms


Error ORA-4031 is normally associated with lack of contiguous space in the shared pool, large pool, or numa pool.  Traditionally, this error was reported due to a high volume of parsing activity in the shared pool, or high memory use due to parallel query, MTS, and/or IO Slaves.  The scope of this note is not to explain the ORA-4031 error, but bring to the attention of the reader a new scenario for this error.

There is a new implementation  in 10G when using Automatic Shared Memory Management (ASMM) and scattered reads that will trigger internal false ORA-4031 errors similar to that error shown below.  When users enable events to dump errorstack traces for this error, a new entry will be reported in the alert.log file. 

The goal of this note is to provide information to Database Administrators and Support Analyst  on this new type of   ORA-4031 error.


Cause

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In this Document
Symptoms
Cause
Solution

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