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Oracle in a Nutshell
book

Oracle in a Nutshell

by Rick Greenwald, David C. Kreines
December 2002
Intermediate to advanced content levelIntermediate to advanced
928 pages
85h 29m
English
O'Reilly Media, Inc.
Content preview from Oracle in a Nutshell

Stored statistics

The cost-based optimizer can select different execution plans based on different statistics. If you feel that the cost-based optimizer is working appropriately and you don’t want new statistics to change execution plans, you can store the statistics for the database with the DBMS_STATS.EXPORT_SCHEMA_STATS procedure to save them before you update the statistics.

If the new set of statistics does not deliver the desired performance or better, you can use the DBMS_STATS.IMPORT_SCHEMA_STATS procedure to reimport the saved statistics.

You can also store multiple versions of statistics in a statistics table you specify.

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Publisher Resources

ISBN: 0596003366Errata Page