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Advantage of using "compute statistics" versus "not compute statistics"

When creating an index, we could choose "compute statistics." Could you please tell me the advantage of "compute statistics" versus "not compute statistics"?

From the Oracle10g documentation:

COMPUTE STATISTICS

In earlier releases, you could use this clause to start or stop the collection of statistics on an index. This clause has been deprecated. Oracle Database now automatically collects statistics during index creation and rebuild. This clause is supported for backward compatibility and will not cause errors.


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