SQL Server slow in production environment
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by Lieven Cardoen
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Published on 2010-03-18T22:27:17Z
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2010/03/18
23:31 UTC
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sql-server
|Performance
I have a weird problem in a customer's production environment. I can't give any details on the infrastructure, except that SQL server runs on a virtual server. The data, log and filestream file are on another storage server (data and filestream together and log on a separate server).
In our local Test environment, there's one particular query that executes with these durations:
- first we clear the cache
- 300ms (First time it takes longer, but from then on it's cached.)
- 20ms
- 15ms
- 17ms
In the customer's production environment, the SQL Server is more powerful, these are the durations (I didn't have the rights to clear the cache. Will try this tomorrow).
- 2500ms
- 2600ms
- 2400ms
The servers in the customer's production environment are more powerful but they do have virtual servers (we don't).
What could be the cause...
- Not enough memory?
- Fragmentation?
- Physical storage?
How would you tackle this performance problem?
EDIT:
Some people have asked me if the data set is equal and it is. I restored their database on our environment. It's true that this was the first thing I looked at. (@Everyone: I added the edit because it will be the first thing that many will think off).
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