After Upgrade to 12c from 11g, Query Uses Nested Loop Instead Of Merge Join, Causing Slow Performance
(Doc ID 2250039.1)
Last updated on JANUARY 15, 2019
Applies to:Oracle Database - Enterprise Edition - Version 184.108.40.206 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 220.127.116.11 to 18.104.22.168, sql is not using merge join anymore, instead it uses nested loop and the script runs forever
Upgraded from 22.214.171.124 to 126.96.36.199
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