What exactly is saved in SQL Server Statistics? When they get updated? Is SQL Server itself is taking care of them?

Posted by Pritesh on Stack Overflow See other posts from Stack Overflow or by Pritesh
Published on 2012-07-04T02:38:46Z Indexed on 2012/07/04 3:16 UTC
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Filed under:

sql-server

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sql-server-2008

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sql-server-2005

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statistics

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query-execution-plans

I have been working with SQL Server as a Developer a while.

One thing I learnt is SQL Server manages Statistics which help Engine to create optimized execution plan.

I could not figure out what exactly is stores in Statistics? (I read it saves Vector, but what Vector?)

When/In which scenario SQL Server updates Statistics?

How/why some time they go out of sync (old Statistics)

In case of old Statistics is a manual DBA/Developer intervention is required or SQL Server Will get them updated.

As a DBA/Developer how to find out if Statistics OLD? What should we do?

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