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05.15.2007 at 11:08AM PDT, ID: 22573815
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7.6

SQL Server 2000 - Slow Running Queries / Optimization

Asked by gobigmedia in MS SQL Server

Tags: , , ,

I have a few stored procedure select queries that are running slowly on my production database.  The queries seem to run fine on our development machine.  Dev machine is under-powered but has no load.  Production has 40-60% load but is more powerful.  We are using SQL Server 2000.

- I have run DBCC INDEXDEFRAG to defrag indexes (they were highly fragmented before).
- Most queries with problems have at lest 3 left joins, sometimes more
- I've noticed in most cases that a Clustered Index Scan is the slow part of a query execution plan for these queries
- Indexes exist for all PK's and there are no TABLE SCANs in any of the queries
- Removing tables, criteria in the where clause, etc.. from the queries doesn't seem to help speed them up
- The tables have around 50k records each, and no more than 5 of these tables are joined on a primary key (which is a uniqueidentifier)
- These tables are updated rarely compared to the times they are queried
- We use sp_EXECUTESQL to run many of these queries (80% of the sp executions are cached in memory)

I know this is kind of general question, but I was hoping for some tips.  It seems like many of the tips i've found already did not help.
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[+][-]05.15.2007 at 01:45PM PDT, ID: 19096145

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[+][-]05.15.2007 at 01:54PM PDT, ID: 19096223

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[+][-]05.15.2007 at 03:56PM PDT, ID: 19097001

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[+][-]05.15.2007 at 08:04PM PDT, ID: 19098099

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About this solution

Zone: MS SQL Server
Tags: sql, slow, server, 2000
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Solution Provided By: nakul_vachhrajani
Participating Experts: 3
Solution Grade: A
 
 
[+][-]05.16.2007 at 05:41AM PDT, ID: 19100199

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[+][-]03.13.2008 at 04:00AM PDT, ID: 21114868

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[+][-]09.05.2008 at 09:26PM PDT, ID: 22405880

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