Most CPU intensive queries

Question

Most CPU intensive queries

ps.

One Orange Chip

Points: 29423
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October 28, 2010 at 6:31 am

#388115

Here is an attachment that lists top 9 queries consuming most CPU time. Line number 7 is most amusing to me as it shows that particular SP has been created 17163 times in the last 12 hours or so (server was rebooted 12 hours prior when this report was pulled).
Mirroring is setup on this server. I am not sure which process is creating this SP for so many times. Any thoughts?

Pradeep Singh

Viewing 7 posts - 1 through 6 (of 6 total)

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ps. One Orange Chip Points: 29423 More actions · Answer 1

I checked the code behind sp_dbmmonitorupdate system stored procedure which is called every minute by the mirror monitoring job. The SP has the following code within it:

exec @retcode = sys.sp_dbmmonitorMSgetthelatestlsn @database_name, @end_of_log_lsn output

I can see sp_dbmmonitorupdate is calling this SP. however i cannot see dbmmonitorMSgetthelatestlsn SP in any of the databases including master/msdb/mirrored databases.

Top 10 CPU intensive queries says this SP is created too frequently. How do i find which process is creating this SP?

sp_dbmmonitorupdate does not have the code to create the other sp. it's just invoking it(and i cannot find that SP).

Anyone has any ideas about it?

Pradeep Singh

Gail Shaw SSC Guru Points: 1004504 More actions · Answer 2

ps. (10/28/2010)
Line number 7 is most amusing to me as it shows that particular SP has been created 17163 times in the last 12 hours or so (server was rebooted 12 hours prior when this report was pulled).

How did you get that list?

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

ps. One Orange Chip Points: 29423 More actions · Answer 3

Hi Gail, I ran this query.

select

highest_cpu_queries.plan_handle,

highest_cpu_queries.total_worker_time,

q.dbid,

q.objectid,

q.number,

q.encrypted,

q.[text]

from

(select top 50

qs.plan_handle,

qs.total_worker_time

from

sys.dm_exec_query_stats qs

order by qs.total_worker_time desc) as highest_cpu_queries

cross apply sys.dm_exec_sql_text(plan_handle) as q

order by highest_cpu_queries.total_worker_time desc

as of now, it is occupying top slot instead of 7th position.

Pradeep Singh

ps. One Orange Chip Points: 29423 More actions · Answer 4

the DBID is 32767 which is resource db i think. is the SP created in memory as resource db is read only? i dont know if that happens.

Pradeep Singh

Gail Shaw SSC Guru Points: 1004504 More actions · Answer 5

It's not creating the proc, it's running it.

When you query sys.dm_exec_sql_text and the handle you pass is for a running stored proc, you get back the creation script for the proc. It does not mean that the proc is being created, it means that the proc is running.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

ps. One Orange Chip Points: 29423 More actions · Answer 6

Thanks a lot Gail. Got my answers 🙂

Pradeep Singh