Optimizer patch recommendation for Oracle

Thanks to Thomas Kempkens from Oracle’s ACS Support who brought this to my attention:

This will just apply to and customers:
It is possible to get an ORA-979 for a query containing a subquery with an aggregate and no group by.
This issue is known as bug7189491 (non-public) – there are one-offs (single patches) available on top of for Linux (32/64bit) and Solaris.
If you’ll still get an ORA-979 then you might set _optimizer_group_by_placement to false

You’ll find further information in Note:8260094

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