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Getting the time it takes a query to execute

How can I get the time it takes for a query to execute? And how I can improve it?

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If you are running SQL*Plus, you can turn on timing (SET TIMING ON) to get a rough idea. If you require more accurate measurement, enable SQL trace and inspect the resulting trace file after processing it with TKPROF. As to how to improve execution time, that's far too general a question; every query and every database are different.

This was first published in October 2004

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