After Upgrade to 12c from 11g, Query Uses Nested Loop Instead Of Merge Join, Causing Slow Performance
(Doc ID 2250039.1)
Last updated on MARCH 03, 2022
Applies to:Oracle Database - Enterprise Edition - Version 220.127.116.11 and later
Oracle Database Cloud Schema Service - Version N/A 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
Information in this document applies to any platform.
- After upgrading our database from 18.104.22.168 to 22.214.171.124, sql is not using merge join anymore, instead it uses nested loop and the script runs forever
Upgraded from 126.96.36.199 to 188.8.131.52
To view full details, sign in with your My Oracle Support account.
Don't have a My Oracle Support account? Click to get started!
In this Document