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Streams Apply Servers Consume Excessive PGA Memory when Using a Statement DML Handler (Doc ID 1527049.1)

Last updated on MARCH 04, 2019

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.2]
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.


The PGA memory consumption of the Apply server processes is excessive when using a statement DML Handler which is utilzing :lcr.KEEP_COLUMNS.

This memory consumption affects the throughput of the system. When the Apply is stopped and restarted the throughput of the system returns to an acceptable level.

The Apply server processes spend a lot of time allocating memory as per the
following stack


Leading to the following accumulation of freeable PGA memory associated with
kol vstring




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