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PGA Grow While Looping At Procedure DBMS_AQ.LISTEN Causing A Small Memory Leak (Doc ID 2755644.1)

Last updated on MARCH 31, 2021

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 to 19.0.0.0 [Release 11.2 to 19]
Information in this document applies to any platform.

Symptoms

A database session looping at DBMS_AQ.LISTEN procedure will see a steady PGA grow, specifically for the 'kol vstring' structure under heap 'koh-kghu call'.

The memory is totally released once the PL/SQL block or the sessions is finished.

Each call to the DBMS_AQ.LISTEN will add a few bytes to the user's PGA, so this issue is relevant and noticeable only when looping thousands of times.

 

Changes

 Implemented Advanced Queue listener feature thru DBMS_AQ.LISTEN.

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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