Things to consider BEFORE upgrading to Oracle 12.1.0.2 to AVOID poor performance and wrong results

Finally it got published on MyOracle Support (MOS) portal – one of the most helpful notes when we prep for an upgrade or a migration – and potentially the one with the longest title in MOS:

MOS Note: 2034610.1
Things to consider BEFORE upgrading to Oracle Database 12.1.0.2 to AVOID poor performance and wrong results 

Avoid Poor Performance and Wrong Results when upgrading to 12.1.0.2

One important note regarding these “Things to Consider” notes:
They will only list issues where either a fix or a proven workaround is available. They don’t list all open issues nor do they recommend every given underscore which may cure one or the other misbehavior.

Just in case you are NOT upgrading/migrating to Oracle Database 12.1.0.2 there are three other helpful notes for earlier releases available as well:

Document 1320966.1
Things to Consider Before Upgrading to 11.2.0.2 to Avoid Poor Performance or Wrong Results
Document 1392633.1
Things to Consider Before Upgrading to 11.2.0.3 to Avoid Poor Performance or Wrong Results
Document 1645862.1
Things to Consider Before Upgrading to 11.2.0.4 to Avoid Poor Performance or Wrong Results

–Mike

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