Oracle Tips by Burleson

Oracle 10g Data Dictionary Table Statistics

To collect statistics on dictionary objects, execute the following statements. The collection process can be done in different formats.

Format (1)
SQL> EXEC DBMS_STATS.GATHER_SCHEMA_STATS ('SYS');

Format (2)
SQL> exec DBMS_STATS.GATHER_DATABASE_STATS (gather_sys=>TRUE);

Format (3)
SQL> EXEC DBMS_STATS.GATHER_DICTIONARY_STATS;

As seen in the above examples, the gather_schema_stats procedure accepts the sys argument to perform statistics collections. In case of the gather_database_stats procedure, there is a new argument gather_sys whose default value is FALSE. When needed, you can set it to TRUE and execute the procedure.

There is another procedure, delete_dictionary_stats, which allows you to remove data dictionary stats.

When you execute the gather_dictionary_stats procedure, it gathers statistics from the SYS and SYSTEM schemas, as well as any other schemas that are related, such as OUTLN or DBSNMP schemas.

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