SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


Finding tempdb contention


Finding tempdb contention

Author
Message
SQL_Surfer
SQL_Surfer
SSCommitted
SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)

Group: General Forum Members
Points: 1668 Visits: 1098
I am having tempdb issue on my server. Everytime it happens, I need to restart the service. Is there a DMV that shows the query causing contention on tempdb?

Thanks in advance.
GilaMonster
GilaMonster
SSC Guru
SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)

Group: General Forum Members
Points: 226365 Visits: 46325
Define 'TempDB issue'? Why do you think it's TempDB contention?

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


SQL_Surfer
SQL_Surfer
SSCommitted
SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)

Group: General Forum Members
Points: 1668 Visits: 1098
The tempdb grows. In other words the drive where my tempdb files are becomes full. When I right click on tempdb, it locks up and I am not able to view the properties.
GilaMonster
GilaMonster
SSC Guru
SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)

Group: General Forum Members
Points: 226365 Visits: 46325
That's not contention, that's just queries using a lot of TempDB.

Query the sys.dm_db_session_space_usage to identify sessions using lots of TempDB. You can join it back to sys.dm_exec_sessions to get the sQL hangle. Will need to poll it, it's just current sessions, not history.

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


SQL_Surfer
SQL_Surfer
SSCommitted
SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)

Group: General Forum Members
Points: 1668 Visits: 1098
Thanks Gail. So, in my situation if I had used this dmv and figured out which query was using most of tempdb and killed it, I wouldn't have to restart the service? Would adding another tempdb file help for future?
GilaMonster
GilaMonster
SSC Guru
SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)

Group: General Forum Members
Points: 226365 Visits: 46325
Kill the query so that the user gets annoyed and re-runs it?

If you're running out of space for TempDB you need to either change the queries so that they use less TempDB or you need to give TempDB more space.

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


SQL_Surfer
SQL_Surfer
SSCommitted
SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)SSCommitted (1.7K reputation)

Group: General Forum Members
Points: 1668 Visits: 1098
Thanks. Which field should I look for heavy usage of tempdb?

user_objects_alloc_page_count?

Is there any threshold to indicate heavy usage?
GilaMonster
GilaMonster
SSC Guru
SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)SSC Guru (226K reputation)

Group: General Forum Members
Points: 226365 Visits: 46325
As with most things, heavy is relative to your app, not an overall distinction.

Look in Books Online for the definitions of the fields, google for any articles or blog posts on the DMV.

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


Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search