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Performance tuning for SQL Server 2005 and Exchange running on SBS

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QUESTION POSED ON: 11 March 2008
I'm interested in your thoughts on performance tuning multiple instances of SQL Server 2005 running on Windows 2003 Small Business Server (SBS).

I have taken over development of an Access 2003 Project against SQL Server 2005 that is having serious performance issues. Upon investigation I discovered the SQL Server is configured to run Exchange Server, File & Print Services and five instances of SQL Server on a HP server with two disks and 2 GB of RAM.

I think the SQL Server instances are causing the problems; each instance takes about 1.7 GB of virtual memory. The instances being run are the following:

Access / Office Application
Backup Exec
Windows Update Service
SharePoint
SMS montitoring

I noticed when the Access Application is running slowly, the free CPU usage is around 90%. I think the SQL Server instances are I/O bound so that the context switches are causing the performance problems.

I plan to increase RAM and the number of disks. But I'm also interested in reducing the number of SQL Server 2005 instances by turning off several services and hopefully sharing SQL Server instances for applications like Backup Windows Update and SMS Services.

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