Migrating from Windows to Linux with Active Duplicate for standby – problem with 11.2.0.4

Recently I was working on migrating Oracle 11.2.0.4 database running on Windows, to new hardware infrastructure on Linux. This Oracle version is with us for quite a long time, plus migration from Windows to Linux is quite common (fortunately in that direction…;)), so when I got an error while trying to use Active Duplicate feature to create a standby database, I was quite sure I’ll be able to quickly find the solution either in MOS or elsewhere. Indeed, I found several blog posts with exactly the same error, but solution mentioned there was not working for me.

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BI jobs performance degradation after Oracle 11.2.0.4 to 12.1.0.2 migration

If you have performance problems after migrating your BI databases from 11.2.0.4 to 12.1.0.2 or any other performance issue, you should not underestimate SQL Plan Notes, which can point you to the right direction or just let you understand what exactly is going on with your queries. Please check below how SQL Plan Notes helped me to investigate problem I recently encountered.

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