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Execution Plan

Postgres has a great ability to show you how it will actually execute a query under the covers. This is known as an execution plan and which is exposed by explain. Understanding this tells you how you can optimize your database with indexes to improve performance. The hard part for most users is understanding the output of these. While there are many pieces involved in understanding here are a few key things most developers should know.

 

Related Articles:

http://postgresguide.com/performance/explain.html

 

 

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