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Don Burleson Blog 







dbms_stats.gather_table_stats tips

Oracle Database Tips by Donald BurlesonMay 17,  2015

Question:  when do I use dbms_stats.gather_table_stats over dbms_stats.gather_schema_stats?  How do I analyze a single table with dbms_stats.gather_table_stats?  When I analyze with dbms_stats.gather_table_stats, are the associated indexes also analyzed?

Answer:  Unlike dbms_stats.gather_schema_stats, which analyzes all tables and indexes within a schema, dbms_stats.gather_table_stats is used to analyze a single table.

          EXEC DBMS_STATS.gather_table_stats('SCOTT', 'EMP');

exec DBMS_STATS.GATHER_TABLE_STATS (ownname => 'SMART' , tabname => 'AGENT',cascade => true, estimate_percent => 10,method_opt=>'for all indexed columns size 1', granularity => 'ALL', degree => 1);

When analyzing a single table, you must also remember to analyze all associated indexes using dbms_stats.gather_index_stats:

exec dbms_stats.gather_table_stats(null, 'CHANGELOG', null, DBMS_STATS.AUTO_SAMPLE_SIZE, false, 'FOR ALL COLUMNS SIZE AUTO');

exec dbms_stats.gather_index_stats(null, 'IDX_PCTREE_PARENTID', null, DBMS_STATS.AUTO_SAMPLE_SIZE);



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