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 SQL Performance issue?

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britnostalgic
Starting Member

1 Post

Posted - 2010-04-13 : 08:36:48
Hi,

A bit of history on the Problem I have:

The server intermittently slows at various hours throughout the day, users complain about slowness, and I can see when using perfmon that the disks and CPU are being hammered. When this is happening, is there a way to single out which database is causing the problem? Simply to digg a little deeper into the problem.

I suspect the storage also i.e. log placement and database locations. But I need more info on this database before I can move things forward. Any ideas peeps?

System overview:

Windows 2003 STD x64 Edition
24GB RAM
Intel Zeon 2.50Ghz (8x dual core CPU's)
Microsoft SQL Server 2005 / 9.0.4035
EMC SAN STORAGE, across several spindles where logs and data are stored.

Background info:

This SQL server holds around 5 instances, and 50 ish databases.






tkizer
Almighty SQL Goddess

38200 Posts

Posted - 2010-04-13 : 14:34:05
You can use SQL Profiler to figure out what's going on. Check for things with high durations, high reads, high writes, and high CPU. Once you've found the queries, check their execution plans for scans. Your issue is likely due to missing indexes as that's a major culprit of sudden high CPU and sudden high I/O.

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
http://weblogs.sqlteam.com/tarad/

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