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Raid Array Design for Multiple Instances of Databases Expand / Collapse
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Posted Saturday, February 16, 2008 1:05 AM
Grasshopper

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Last Login: Monday, October 4, 2010 8:50 AM
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We are having multiple instances of single database & single cpu with 3.00 ghz & ram with 4 gb but still the users are facing poor performance in accessing the applicaton, ultimately slow performance.

CPU SPIKES ARE GOING VERY HIGH & RAM AVAILABLE IS 1 GB.HDD IS 146 * 5 .

Please guide us on this topic how to design RAID for 29 intances of database.

Is there anybody who can focus on it ?[/font]

Vrijesh Prajapati
Post #456607
Posted Saturday, February 16, 2008 3:05 AM
Ten Centuries

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Last Login: Thursday, January 30, 2014 10:08 PM
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Could you run SQL Profiler against your database and see which queries are taking the longest to execute? From that you could see if you have
a) Poor indexing on your tables
b) Poorly written application software that does things like selecting * from an entire table just to get a record or two
c) Lots of blocking - eg holding open a transaction whilst a user responds to a yes/no question on screen
d) Table scans vs index seeks

Poor performance is not always solvable by throwing more resources at your server. Often it's due to poor application design. Could you run profiler as suggested and perhaps post some of the queries here along with sample data and table structures? Before posting please read http://www.sqlservercentral.com/articles/Best+Practices/61537/

After ensuring your problems are not any of the above then we should consider putting transaction logs onto different drives from your database files, etc. There's no point in trying to put a V8 engine in a car with inadequate steering and a poor gearbox (make up your own analogy to suit :D )



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