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10.08.2008 at 06:38AM PDT, ID: 23797195
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7.4

Can you force a session to use a new execution plan whilst it is still active?

Asked by BravehearT-1326 in MS SQL Server

Tags: , , ,

Hi experts - please can you assist with the following.  Bear with me whilst I attempt to explain what the issue is.

Main table has approx 200 million rows

We have a stored proc that is a good candidate for a rewrite but that is a little way off.  It basically does 2 joins on the same table to produce a set of results that are used by another SP.  

It has started to run slow and I put a trace on the SQL database and ran it thru the Database Tuning Advisor and it came up with a list of suggested NEW indexes.  We applied these and when we run the query ourselves and pass it the details we can see that it will indeed use the new index.

My question is the SP is running / processing most of the day - is there any way to force it to pick up the new execution plan whilst it is active so that the next file it processes it will use the NEW execution plan as it appears to be still running using the old one.

I've tried the following commands to try and clear the CACHE so that the SP would have to use the new execution plan.

Any one advise on the best way to get this new plan in use?Start Free Trial
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DECLARE @intDBID INTEGER SET @intDBID = (SELECT dbid FROM master.dbo.sysdatabases WHERE name = 'myDatabaseName')
DBCC FLUSHPROCINDB (@intDBID)
 
and
 
DBCC DROPCLEANBUFFERS
go
 
DBCC FREEPROCCACHE
go
[+][-]10.08.2008 at 07:44AM PDT, ID: 22669543

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[+][-]10.08.2008 at 08:30PM PDT, ID: 22675483

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[+][-]10.09.2008 at 01:37AM PDT, ID: 22676505

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[+][-]10.09.2008 at 04:09AM PDT, ID: 22677117

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About this solution

Zone: MS SQL Server
Tags: Microsoft, SQL Server, 2000, procedure cache clearing
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Solution Provided By: VMontalvao
Participating Experts: 2
Solution Grade: B
 
 
[+][-]10.09.2008 at 10:37AM PDT, ID: 22680631

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