ALL_SYNONYMS

Query on ALL_SYNONYMS is slow in Oracle Database 12c

A customer (Thanks Stefano!) alerted me on this issue during a workshop and I did some further investigation. Basic headline is:

Query on ALL_SYNONYMS is very slow in Oracle Database 12.1.0.2 compared to 11g.

The workaround for this  21324443: SLOW QUERY IN 12C ON ALL_SYNONYMS. is:

dbms_stats.gather_table_stats('SYS','OBJ$',estimate_percent
=>100, method_opt => 'for columns flags size 1, spare3 size 254, type# size 254');

and I see that at least 8 other customers opened SRs hitting the same issue.
Does the workaround suit you in any way?

The bug had no progress since it was opened. If you are seeking progress …

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