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SQL Query causing CPU Spikes on SQL Server...
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SQL Query causing CPU Spikes on SQL Server 2008 r2
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APA0876
APA0876
Posted Thursday, January 10, 2013 2:17 PM
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Group: General Forum Members
Last Login: Tuesday, February 19, 2013 1:46 PM
Points: 112,
Visits: 255
Hi,
I have a curious case here: there is a SQL Query that is causing 90% of CPU on one of the SQL servers also it run in 14 seconds, on other server with similar specs the query executes in less than a second and no cpu spikes also the server configurations are the same:
What can be happening here?
select distinct
spid = cast(p.spid as int),
program = p.program_name,
host = p.hostname,
login = p.loginame,
databasename = replace(db_name(ISNULL(convert(int,l.rsc_dbid),-1)),char(39),char(39)+char(39)),
object = ISNULL(l.rsc_objid,-1),
request_mode = substring (v.name, 1, 8),
blockedwait = b.waittime,
inputbuffer = case when isnull(p.net_address, '') = '' then null else (select case when dmv.objectid is null then left(max(text),4000) else null end from sys.dm_exec_sql_text(p.sql_handle) dmv group by dmv.objectid) end,
starttime = dateadd(ss,cast(b.waittime as float)/1000 * -1,getutcdate())
from
master..sysprocesses p (nolock)
left join master..sysprocesses b (nolock)
on p.spid = b.blocked
left outer join master..syslockinfo l (nolock)
on b.spid = l.req_spid
and l.req_status in (2,3)
left join master.dbo.spt_values v
on convert(int,l.[req_mode]) + 1 = v.number
where
p.blocked = 0
and p.program_name not like 'SQLAgent%'
and p.program_name not in ('SQL PerfMon')
and b.blocked <> 0
and b.waittime > 166000
and v.type = 'L'
Thanks for your help
Post #1405643
Vedran Kesegic
Vedran Kesegic
Posted Thursday, January 10, 2013 7:05 PM
Old Hand
Group: General Forum Members
Last Login: Thursday, May 16, 2013 8:08 AM
Points: 342,
Visits: 1,072
Check if actual execution plans are different. Are those virtual machines?
_____________________________________________________
XDetails Addin
- for SQL Developers and DBA
blog.sqlxdetails.com
- Transaction log myths - debunked!
Post #1405722
SQLRNNR
SQLRNNR
Posted Thursday, January 10, 2013 8:12 PM
SSCoach
Group: General Forum Members
Last Login: Yesterday @ 1:07 PM
Points: 18,733,
Visits: 12,332
Please provide the actual execution plan for both servers for the query.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
Posting Data Etiquette - Jeff Moden
Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp
Post #1405734
APA0876
APA0876
Posted Thursday, January 10, 2013 9:06 PM
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Group: General Forum Members
Last Login: Tuesday, February 19, 2013 1:46 PM
Points: 112,
Visits: 255
How can I send the execution plan on an xml format?
Thanks
Post #1405746
SQLRNNR
SQLRNNR
Posted Thursday, January 10, 2013 9:13 PM
SSCoach
Group: General Forum Members
Last Login: Yesterday @ 1:07 PM
Points: 18,733,
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See the first link in my signature. The instructions for posting the exec plan are there.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
Posting Data Etiquette - Jeff Moden
Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp
Post #1405748
Bhuvnesh
Bhuvnesh
Posted Thursday, January 10, 2013 11:54 PM
SSCrazy
Group: General Forum Members
Last Login: Tuesday, March 26, 2013 8:41 AM
Points: 2,562,
Visits: 3,451
APA0876 (1/10/2013)
there is a SQL Query that is causing 90% of CPU on one of the SQL servers also it run in 14 seconds, on other server with similar specs the query executes in less than a second and no cpu spikes also the server configurations are the same:
did you run the query at the same time?
are both(or other servers ) returning same records for this query ?
do both servers have same load (like job or background prcosses)
do they have same equal no of connections (at the time of query) ?
-------Bhuvnesh----------
While 1 = 1 (Learning SQL....)
Click to get fast response of your post
Post #1405782
APA0876
APA0876
Posted Friday, January 11, 2013 8:10 AM
SSC-Enthusiastic
Group: General Forum Members
Last Login: Tuesday, February 19, 2013 1:46 PM
Points: 112,
Visits: 255
Bhuvnesh (1/10/2013)
APA0876 (1/10/2013)
there is a SQL Query that is causing 90% of CPU on one of the SQL servers also it run in 14 seconds, on other server with similar specs the query executes in less than a second and no cpu spikes also the server configurations are the same:
did you run the query at the same time?
are both(or other servers ) returning same records for this query ?
do both servers have same load (like job or background prcosses)
do they have same equal no of connections (at the time of query) ?
Yes I run the query at the same time
Yes 0 records
different Load the server with the spikes is 20 % avg CPU and the other 5% Avg CPU
On the server having the CPU spike there are 1700 connections and the other 10 connections.
But what should I do, this query is exected every 6 minutes because is part of a diagnostic Tool.
Thanks
Ailyn
Post #1406055
anthony.green
anthony.green
Posted Friday, January 11, 2013 8:18 AM
SSCertifiable
Group: General Forum Members
Last Login: Friday, April 12, 2013 3:51 AM
Points: 5,075,
Visits: 4,831
I would completly re-write it all, for one all the tables used are depreciated and are in the product for SQL 2000 compatability only, you really should be using the DMV's.
Want an answer fast? Try here
How to post data/code for the best help - Jeff Moden
Need a string splitter, try this - Jeff Moden
How to post performance problems - Gail Shaw
CrossTabs-Part1
&
Part2 - Jeff Moden
SQL Server Backup, Integrity Check, and Index and Statistics Maintenance - Ola Hallengren
Managing Transaction Logs - Gail Shaw
Troubleshooting SQL Server: A Guide for the Accidental DBA - Jonathan Kehayias and Ted Krueger
Post #1406063
SQLRNNR
SQLRNNR
Posted Friday, January 11, 2013 8:18 AM
SSCoach
Group: General Forum Members
Last Login: Yesterday @ 1:07 PM
Points: 18,733,
Visits: 12,332
APA0876 (1/11/2013)
Bhuvnesh (1/10/2013)
APA0876 (1/10/2013)
there is a SQL Query that is causing 90% of CPU on one of the SQL servers also it run in 14 seconds, on other server with similar specs the query executes in less than a second and no cpu spikes also the server configurations are the same:
did you run the query at the same time?
are both(or other servers ) returning same records for this query ?
do both servers have same load (like job or background prcosses)
do they have same equal no of connections (at the time of query) ?
Yes I run the query at the same time
Yes 0 records
different Load the server with the spikes is 20 % avg CPU and the other 5% Avg CPU
On the server having the CPU spike there are 1700 connections and the other 10 connections.
But what should I do,
this query is exected every 6 minutes because is part of a diagnostic Tool.
Thanks
Ailyn
Post the execution plans so we can better see what is happening and provide better answers.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
Posting Data Etiquette - Jeff Moden
Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp
Post #1406064
APA0876
APA0876
Posted Friday, January 11, 2013 8:40 AM
SSC-Enthusiastic
Group: General Forum Members
Last Login: Tuesday, February 19, 2013 1:46 PM
Points: 112,
Visits: 255
APA0876 (1/10/2013)
How can I send the execution plan on an xml format?
Thanks
I posted two SQLPlans one for the server with the spike and the other sql for server that is OK
Post Attachments
ServerWSpike.sqlplan
(
10 views,
75.46 KB
)
ServerOK.sqlplan
(
2 views,
72.49 KB
)
Post #1406090
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