After server move a query doesn't work anymore - sql

Question

I need some help for a problem that's driving me crazy!
I've moved an ASP + SQL Server application from an old server to a new one.
The old one was a Windows 2000 server with MSDE, and the new one is a Windows 2008 with SQL Server 2008 Express.
Everything is ok, even a little faster, except just one damned function whose asp page gives a time out.
I've tried the query within that page in a management query windows and it never ends, while in the old server it took about 1 minute to be completed.
The query is this one:
SELECT DISTINCT
TBL1.TBL1_ID,
REPLACE(TBL1_TITOLO, CHAR(13) + CHAR(10), ’ ’),
COALESCE(TBL1_DURATA, 0), TBL1_NUMERO,
FLAG_AUDIO
FROM
SPOT AS TBL1
INNER JOIN
CROSS_SPOT AS CRS ON CRS.TBL1_ID = TBL1.TBL1_ID
INNER JOIN
DESTINATARI_SPOT AS DSP ON DSP.TBL1_ID = TBL1.TBL1_ID
WHERE
DSP.PTD_ID_PUNTO = 1044
AND DSP.DSP_FLAG_OK = 1
AND TBL1.FLAG_AUDIO_TESTO = 1
AND TBL1.FLAG_AUDIO_GRAFICO = ’A’
AND CRS.CRS_STATO > 2
OR TBL1.TBL1_ID IN (SELECT ID
FROM V_VIEW1
WHERE ID IS NOT NULL AND V_VIEW1.ID_MODULO = 403721)
OR TBL1.TBL1_ID IN (SELECT TBL1_ID
FROM V_VIEW2
WHERE V_VIEW2.ID_PUNTO = 1044)
ORDER BY
TBL1_NUMERO
I've tried to transform the 2 views in last lines into tables and the query works, even if a little slower than before.
I've migrated the db with it's backup/restore function. Could it be and index problem?
Any suggestions?
Thanks in advance!
Alessandro

Answer 1

Run:
--Defrag all indexes
sp_msForEachTable 'DBCC DBREINDEX (''?'')'
--Update all statistics
sp_msForEachTable 'UPDATE STATISTICS ? WITH FULLSCAN'
If that doesn't "just fix it", it's going to some subtle "improvement" in the SQL Server optimizer that made things worse.
Try the index tuning wizard (or whatever its SSMS2008 equivalent).
After that, you'll have to start picking the query apart, removing things until it runs fast. Since you have 2 OR clauses, you basically have 3 separate queries:
SELECT ... FROM ...
WHERE DSP.PTD_ID_PUNTO = 1044
AND DSP.DSP_FLAG_OK = 1
AND TBL1.FLAG_AUDIO_TESTO=1
AND TBL1.FLAG_AUDIO_GRAFICO=’A’
AND CRS.CRS_STATO>2
--UNION
SELECT ... FROM ...
WHERE TBL1.TBL1_ID IN (
SELECT ID
FROM V_VIEW1
WHERE ID IS NOT NULL
AND V_VIEW1.ID_MODULO = 403721
)
--UNION
SELECT ... FROM ...
WHERE TBL1.TBL1_ID IN (
SELECT TBL1_ID
FROM V_VIEW2
WHERE V_VIEW2.ID_PUNTO = 1044
)
See which one of those is the slowest.
p.s. A query taking a minute is pretty bad. My opinion is that queries should return instantly (within the limits of human observation)