Question

performance of SQL

Asked by: mcrmg

Hi,

I just upgraded from SQL 2000 to SQL 2008, with faster server, but when I run it from my ASP application, it is slower? any ideas?  thx

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Asked On
2009-10-31 at 06:37:50ID24860668
Topic

SQL Server 2008

Participating Experts
3
Points
500
Comments
13

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Answers

 

by: Big_WillPosted on 2009-10-31 at 06:44:02ID: 25709729

are yourunning the latest version of ASP?

 

by: rrjegan17Posted on 2009-10-31 at 06:50:30ID: 25709768

>> I just upgraded from SQL 2000 to SQL 2008

You need to rebuild all your indexes in your table so that Statistics would be updated for your 2008 database which would help your database to perform better.

Run this script in your database to rebuild all indexes:

sp_MSforeachtable 'ALTER INDEX ALL ON ? REBUILD'

Its recommended to rebuild indexes after Upgrades or a Backup is restored..

 

by: mcrmgPosted on 2009-10-31 at 06:59:35ID: 25709812

Okay, will post back with after running it. Thx

 

by: aneeshattingalPosted on 2009-10-31 at 08:31:50ID: 25710122

also make sure that you change the compatability to 100 from 80 , i had some issues with some of my clients mainly because of the tempdb,you may have to create as many filegroups for the tempdb as the number of processors on your server

 

by: mcrmgPosted on 2009-10-31 at 08:38:22ID: 25710155

where can I change compatability ?  thx

 

by: mcrmgPosted on 2009-10-31 at 08:41:50ID: 25710169

I have been using this to reindex in SQL2000, can I use this to reindex in SQL2008? or it is better to use

sp_MSforeachtable 'ALTER INDEX ALL ON ? REBUILD'


thx



DECLARE @TableName varchar(255)
DECLARE @SQL varchar(2000)

DECLARE TableCursor CURSOR FOR
SELECT table_name FROM information_schema.tables
WHERE table_type = 'base table'

OPEN TableCursor

FETCH NEXT FROM TableCursor INTO @TableName
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT 'Reindexing ' + @TableName
SET @SQL = 'DBCC DBREINDEX(' + @TableName + ','''',90)'
EXEC (@SQL)
FETCH NEXT FROM TableCursor INTO @TableName
END

CLOSE TableCursor

DEALLOCATE TableCursor

 

by: rrjegan17Posted on 2009-10-31 at 08:41:53ID: 25710170

Steps to change compatibility level:

http://msdn.microsoft.com/en-us/library/bb933794.aspx

 

by: aneeshattingalPosted on 2009-10-31 at 08:42:09ID: 25710173

right click on the db -> properties -> options -> compatability

 

by: rrjegan17Posted on 2009-10-31 at 08:42:37ID: 25710175

>> sp_MSforeachtable 'ALTER INDEX ALL ON ? REBUILD'

This wont work in SQL Server 2000 since ALTER INDEX is present in SQL Server 2005 and 2008 alone.

 

by: mcrmgPosted on 2009-10-31 at 08:54:38ID: 25710217

so in SQL2008, you would suggest that I use sp_MSforeachtable 'ALTER INDEX ALL ON ? REBUILD'

instead of the sp posted prviously?  thx

 

by: rrjegan17Posted on 2009-10-31 at 08:55:54ID: 25710223

Yes..Exactly

 

by: mcrmgPosted on 2009-10-31 at 09:27:46ID: 25710329

okay, so I assume that I can modify the sp to

SET @SQL =   'ALTER INDEX ALL ON ' + @TableName + '  REBUILD'

??

in the future, if I need to reindex weekly, do I still use the same query?  thx

 

by: rrjegan17Posted on 2009-10-31 at 10:13:42ID: 25710522

Along with

EXEC (@SQL)

to

exec sp_executesql @sql

eventhough both will work, exec () syntax might be removed in later versions.

20120131-EE-VQP-002

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