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For example, you could export statistics from a production system to a test system.

In addition, you can lock statistics to prevent those statistics from changing.

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An execution plan is like a set of instructions that tells Oracle how to go and get the data. In it, the optimizer tells Oracle to first go get all the rows of the EMP department, and then sort those rows (Reading an execution plan is somewhat of an art, so trust us on this one, the full scan of the EMP table is first).

Oracle gathers statistics on all database objects automatically and maintains those statistics in a regularly-scheduled maintenance job.

Automated statistics collection eliminates many of the manual tasks associated with managing the query optimizer, and significantly reduces the chances of getting poor execution plans because of missing or stale statistics. The procedure collects statistics on database objects when the object has no previously gathered statistics or the existing statistics are stale because the underlying object has been modified significantly (more than 10% of the rows).

The lock methods are described in "Locking Statistics for a Table or Schema".

The recommended approach to gathering statistics is to allow Oracle to automatically gather the statistics.




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