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In the context of a database, optimisation refers to the process of the query optimiser selecting an efficient physical execution plan.

4
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The generic answer is to take a look at the execution plan. Are your joins indexed? Are your output fields included in those indexes? Are you only outputting the columns you need to see?
answered Feb 22 '11 by Matt M
47
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There are a few concepts and terms that are important to understand when dealing with indexes. Seeks, scans, and lookups are some of the ways that indexes will be utilized through select statements. …
answered Jan 10 '11 by Matt M