HOW TO DEBUG ABSTRACT LOB PGA MEMORY ALLOCATION
(Doc ID 2780987.1)
Last updated on JUNE 25, 2021
Applies to:Oracle Database - Enterprise Edition - Version 10.2.0.5.0 to 188.8.131.52.0 [Release 10.2 to 19]
Information in this document applies to any platform.
This document applies to Oracle Database - Enterprise Edition - Version 184.108.40.206 to 220.127.116.11.0 [Release 9.2 to 19.11] It explains how to diagnose memory allocation generated by abstract LOB. Abstract LOBs are temporary lobs returned from queries involving XMLType columns. As described in the note 1955135.1 pga allocated by abstract lob may not be released leading to pga memory exhaustion. This node provides a sample testcase to reproduce this scenario. It gives the instruction to dump and analyze the memory allocation. Do not execute this testcase in a production environment use it solely on test and training. To correctly manage the abstract lob pga memory allocation read the following note use 1955135.1 Best practices for XMLType Temporary LOB Usage carefully.
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