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12c Upgrade – Pre-Upgrade Utility sets PGA_AGGREGATE_LIMIT to 2 GB automatically (Doc ID 2212556.1)

Last updated on APRIL 05, 2020

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.


 While upgrading to (with DB PSU applied),the Oracle 12c-DBUA-upgrade process sets PGA_AGGREGATE_LIMIT to 2 GB.

This causes pga_aggregate_target > pga_aggregate_limit.In example below pga_aggregate_target has been set to 3700MB before upgrading to 12c. The DBUA set pga_aggregate_limit to 2 GB, so 3700 MB for PGA can’t be used. This forced an ORA-04036 in alert.log




 Target Home had the April 2016 DB PSU Patch 22291127 installed


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In this Document
 Explanation about the parameter PGA_AGGREGATE_TARGET,PGA_AGGREGATE_LIMIT & What should I do if my upgrade fails with ORA-4036

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