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Measuring SQL Performance


Measuring SQL Performance

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Grant Fritchey
Grant Fritchey
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That really depends on the system. Most of our systems work just fine with the sampled statistics update, but we have a few tables on a few systems that need an occasional full scan. I wouldn't recommend running full scan all the time, but an occasional use of it sure won't hurt. That assumes you're doing it off-hours if you're going to full scan the entire db.

----------------------------------------------------
The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood...
Theodore Roosevelt

The Scary DBA
Author of: SQL Server Query Performance Tuning and SQL Server Execution Plans
Product Evangelist for Red Gate Software
DBA-640728
DBA-640728
Mr or Mrs. 500
Mr or Mrs. 500 (553 reputation)Mr or Mrs. 500 (553 reputation)Mr or Mrs. 500 (553 reputation)Mr or Mrs. 500 (553 reputation)Mr or Mrs. 500 (553 reputation)Mr or Mrs. 500 (553 reputation)Mr or Mrs. 500 (553 reputation)Mr or Mrs. 500 (553 reputation)

Group: General Forum Members
Points: 553 Visits: 1993
thank you, so its not really needed to do an update statistics after these stored procedures parameter sniffing issues has been fixed? would it make any difference? i don't have my update statistics scheduled until the weekend, or should i run it now?
Grant Fritchey
Grant Fritchey
SSCoach
SSCoach (17K reputation)SSCoach (17K reputation)SSCoach (17K reputation)SSCoach (17K reputation)SSCoach (17K reputation)SSCoach (17K reputation)SSCoach (17K reputation)SSCoach (17K reputation)

Group: General Forum Members
Points: 17575 Visits: 32258
When you deploy the stored procedures, they'll use the statistics to compile a new plan. If the statistics are maintained well enough for normal purposes, they'll be fine for this. No, I wouldn't say you need to do a special update just because you've tune the queries.

That's assuming that you know that your statistic maintenance routines are good.

----------------------------------------------------
The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood...
Theodore Roosevelt

The Scary DBA
Author of: SQL Server Query Performance Tuning and SQL Server Execution Plans
Product Evangelist for Red Gate Software
DBA-640728
DBA-640728
Mr or Mrs. 500
Mr or Mrs. 500 (553 reputation)Mr or Mrs. 500 (553 reputation)Mr or Mrs. 500 (553 reputation)Mr or Mrs. 500 (553 reputation)Mr or Mrs. 500 (553 reputation)Mr or Mrs. 500 (553 reputation)Mr or Mrs. 500 (553 reputation)Mr or Mrs. 500 (553 reputation)

Group: General Forum Members
Points: 553 Visits: 1993
THANK YOU!
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