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Unusually High CPU on SQL Server the 2nd day after a reboot.

JL
To All,

I have a SQL2KSP3a database(<1GB) running on a 4x3GB physical CPU with
4GB of ram. It is Windows Server 2003 with hyper-threading turn on.
There are ~420 .Net users/cxns (fat client, no web/app servers) with
connection pooling and ~1 trx/sec. The database growth is neglegeable
and actually is not even relevent which I will explain in a minute.
99% of the trxs are from one SP that does a select. The resultsets are
relatively small as well 1~100 rows. Yes I have tuned it with index
tuning wizard as well, changed the SQL memory configurations, etc....

My problem is this...
The first day after a reboot, the server runs 6%CPU during peak hours.
During the non-peak hours until the next day something apparently
happens. The next day (2nd day after a reboot), it jumps to 40%CPU
during peak hours. The server will continue to run at 40%CPU during
peak hours until the next reboot. This phenomenon has been occurring
for 6 months or more and the traffic on the server is the same for day
1 as it is for day 2,3,4,... This database was on another server with
100+ dbs and exibited the same behavior, thus bringing that server to
its knees, and thus we had to move it to the server in question with no
other dbs.

I have googled my eyes out, Microsoft site, white papers, perfmon,
SQLDiag, PSSDiag, execution plans, index tuning wizard, and the list
goes on! I currently have a case open with Microsoft that has been
open for months now. I have been passed around to the 3rd "MS Tech
Specialist". I have ran PSSDiag a total of 6 times for them for hours
on end. I have changed MAXDOP. I could give more information, but I
would be here for days. I am running out of patience/ideas and
Microsoft is apparently blowing smoke.
Any ideas are greatly appreciated!
Thanks in advance!
JL

Jul 23 '05
10 7311
I have experienced a similar problem for months and finally have a
solution.

If you have non-unicode varchar columns in your database, and you use
prepared statements, and you are querying against indexes on these
columns, your queries are probably not using the indexes. By default
the jdbc driver passes string parameters as unicode, and the unicode
paramaters do not use non-unicode indexes.

Try adding the following to your connection string

SendStringParam etersAsUnicode= false

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Jul 23 '05 #11

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