Question

SQL Update execution plan

Asked by: sublimation

HI, what is the stored proc that updates the execution plan?

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Asked On
2009-01-07 at 05:31:42ID24031276
Topic

MS SQL Server

Participating Experts
2
Points
250
Comments
7

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  1. Recompilation of execution plans
    I'm aware that I can force the recompilation of a stored procs execution plan (using the various RECOMPILE methods) and when I would want to do this. Can I do the same for an ad-hoc statement (which also saves an execution plan)? The problem is we have a lot of memory which...
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Answers

 

by: gkernPosted on 2009-01-07 at 05:33:55ID: 23314362

What?

 

by: gkernPosted on 2009-01-07 at 05:36:30ID: 23314382

r u asking about the
 WITH RECOMPILE option that prevents reusing the stored procedure execution plan

 

by: chapmandewPosted on 2009-01-07 at 05:36:52ID: 23314388

none that I am aware of...there are commands that will update statistics, which will likely require a new exec plan

update statistics 'tablename'

OR, there is a proc that will cause a proc to recompile

sp_recompile 'procedurename'

this what you're looking for?

 

by: sublimationPosted on 2009-01-07 at 05:54:58ID: 23314533

Yes, my proc is running really slow, will sp_recompile 'procedurename' help it?

 

by: sublimationPosted on 2009-01-07 at 05:57:51ID: 23314560

I think I actually need to update execution plan

 

by: chapmandewPosted on 2009-01-07 at 06:04:21ID: 23314606

You can't just update the execution plan.

Does your proc usually run fast?  Are there a lot of users on yoru system right now?

 

by: gkernPosted on 2009-01-07 at 06:10:45ID: 23314651


"Reusing an execution plan saves the time spent on the stored procedure compilation, but in many queries, especially complex joins on large tables, the compilation time is significantly less than the time needed for execution. Therefore, you may need to recompile the stored procedure execution plan to increase the chance that the best plan be used. There are three ways to cause SQL Server to recompile the stored procedure execution plan:

Including a WITH RECOMPILE clause in a CREATE PROCEDURE statement. When you include a WITH RECOMPILE clause in a CREATE PROCEDURE statement, SQL Server will not cache a plan for this procedure and the procedure will be recompiled every time it runs. Since the stored procedure execution plan will never be cached, you should use the RECOMPILE option in a CREATE PROCEDURE statement very carefully.

Including a WITH RECOMPILE clause in a EXECUTE statement. When you include a WITH RECOMPILE clause in a EXECUTE statement, the stored procedure execution plan will be recompiled when you run this EXECUTE statement. You can use this option if the parameters you are supplying are atypical or if the data has significantly changed.

Using the sp_recompile system stored procedure causes stored procedures to be recompiled the next time they are run. To cause stored procedures to be recompiled the next time they are run, you can use the sp_recompile system stored procedure. You can use the sp_recompile system stored procedure when you want your stored procedure to reflect changes in indexes or data values.

Because SQL Server 2000 can recompile stored procedures and execution plans automatically, in most cases it is not necessary to use the sp_recompile system stored procedure or a WITH RECOMPILE clause, and you can rely on SQL Server decisions to recompile the execution plan."

http://www.databasejournal.com/features/mssql/article.php/3067071/SQL-Server-Stored-Procedures-Administration.htm


There are many thing that can cause a stored procedure to run slow!
Was it run fast before? Is there lots of activity on referenced tables\indexes? are there many users? Many sessions?

20120131-EE-VQP-002

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