Oracle Data Dictionary Statistics tips

Expert Oracle Database Tips by Donald BurlesonDecember 8, 2015

Question: I have a slow data dictionary query, and I wonder if analyzing the data dictionary with dbms_stats will help the SQL performance. How do I gather statistics on my v$ views?

Answer: Before tuning any v$ query, make sure that you have gathered fixed statistics on the data dictionary. See these notes on details for analyzing the fixed Oracle tables;

Getting statistics for the v$ views is easy, you can gather fixed object statistics by using the dbms_stats gather_database_stats procedure and setting the gather_fixed argument to TRUE (the default is FALSE). You can also invoke the gather_fixed_object_stats procedure:

DBMS_STATS.GATHER_FIXED_OBJECTS_STATS('ALL')

Also see these notes on tuning data dictionary queries.

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