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Don Burleson Blog 







Oracle statistics?

Oracle Database Tips by Donald BurlesonMay 9,  2015

Question:  I hear about the importance of Oracle statistics.  What are Oracle statistics?

Answer:  The term "Oracle statistics" may refer to historical performance statistics that are kept in STATSPACK and AWR, but a more common use of the term "Oracle statistics" is about Oracle optimizer "Metadata statistics" in order to provide the cost-based SQL optimizer with the information about the nature of the tables.

Oracle statistics tell you the size of the tables, the distribution of values within a columns, and other important information so that SQL statements will always generate the "best" execution plans.  See here for more of my notes on Oracle statistics:

  1. Oracle dbms_stats optimizer statistics

  2. Gathering Oracle Statistics

  3. 11g extended Oracle statistics

  4. Oracle CBO optimizer Oracle statistics

  5. Export Import Oracle statistics

  6. Missing Oracle statistics

  7. Important notes for Oracle statistics

  8. performance degradation caused by bad Oracle statistics

  9. Oracle bad optimizer CBO statistics



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