DB Engine :: How To Recycle TempDB Without Rebooting It
May 21, 2013
We have an App server where Microsoft reporting services (report Builder 2005) is hosted and the backend Database server which is used by the reporting services.
The clients create very complex reports (usually towards month end) and run against the database causing the tempdb grow expenentially, leading to perfromance degradation and worst case space issues.Our only solution is to reboot the server.
There should be many systems which sould be having similar scenarios like mine. How to handle the scenario.usually in my database tempdb should be below 15GB... but it had grown to 60GB in some instances.
I try to find some feedback regarding setting the TempDB files on a RAM disk.Specifically I am looking for "production results" that could show the difference/benefit of such an usage.The tests on physical server and VM I already made have shown a boost in overall SQL Server 2012 performance on SQL Server instances housing data for SharePoint 2013 and Dynamics AX 2012 R2.Graphic below show differences between 5 different configuration on the same physical server:
- Physical HD: Server with local HD - Physical SANEX1PRD: Server with TempDB files stored on a low-end SAN - Physical SAN1: Server with TempDB files stored on a high-end SAN (around 100000 IOps) - Physical SAN1 Jumbo: same setup with Jumbo Frame activated on NIC and DB engine - Physical RAMdrive: with TempDB files stored on a 16 GB soft RAM drive within OS memory
Results were really impressive for the DB engine housing Dynamics AX data. My colleagues from the SharePoint team told me it also boosted a bit overall SharePoint performances but they did not have any baseline comparison to show.If you have some feedback, results, links, whatever I am interested.Indeed before setting this to all our SQL Server 2012 instances I y rather collect some *real world* feedback.
In tweaking performance of tempdb by adding add'l data files I want to reset back to defaults and remove all add'l files I've created. I was not able to do it for most as they were in use, but by starting the server in single-user mode with all other sql services shut off, and using sqlcmd I was able to use the ALTER DATABASE tempdb REMOVE FILE <tempdev#> to remove the files... except for one.
Restarted SQL server, and tried the ALTER DATABASE ... REMOVE FILE again but am always denied with the message that the file can't be removed b/c it's still in use.
I also tried to shrink it with EMPTYFILE but that also fails with the message that a page is a work table page and can't be removed.
I really need to get tempdb back to just one data file but am unable to find a way to remove this last data file.
In on of the server tempdb is not releasing the reserved space after completion of data loads,as of now 99% of free space available in data file,we tried to shrink the datafile ,and space has not been released.
Could a simple update statement on a user database ever caused space usage in tempdb? Assuming the update statement fires no triggers and not using any temp tables?
IE:
User DatabaseA Update TableX Set col1 = X
Reason I ask is tempdb filled up and the only thing I could see running at that time was the update statement.
I have used Extented event to monitor the occurances of TempDB contention on Production server . I found there are several entried logged in in 30 mints .Now I am trying to determin if Tempdb contention on PFS, GAM or SGAM page then I will decide if I need to increase the number of TempDB data files on Production server . Currently , There are 8 TempDB Data files configured on its separate Disks .There are Page_IDs I found in the extented events for Tempdb files -
Page_ID =1 for PFS page Page_ID = 2 for GAM page Page_ID =3 for SGAM page
but I found the Below Page_IDs and I know there is a formula that you can use to identify if page is PFS,GAM or SGAM ? How should I use this formula and what should I look for to determine if page is PFS,GAM or SGAM ? Is there any threshold value for the duration of TempDB contention occured ?
today I've put in production a big database accessed by 200 concurrent users, this database has READ_COMMITTED_SNAPHOT set to ON.I know that RCSI set to ON is very aggressive on tempDB so I'm monitoring it.I've noticed that the Transaction log space usage (%) on TempDB is slowly but ever increasing, I mean in the last 24 hours I've started from a 99% space free, now we are 37% space free...is it normal? TempDB log is 35GB in size.
I have scenario where I have process that loades data into SQL server 2012 database by doing some manipulation on data like sorting , aggregation, etc. Once this process is completed it's not free up the Tempdb space. If I restart the database, then it does.
is there any way (apart from shirking) to release space for Tempdb, like writing some post SQL queries to delete/ truncate the data and logs from temp db?
Is there any way to recycle SQL Server memory, other than restarting the service? Should we restart the service on schedule? The memoy goes high and once high it stays there. SQL Server is not releasing it...
After lots of testing I have found that re-using dialogs improves performance significantly, however I cannot fathom out what is the cost of re-using them. Performance does not come for free hene why I feel there is a cost. Can anyone shed any light on the cost of re-using dialogs? Also why should you re-cycle them? What benefits does recycling dialogs have?
I have a customer who is having slow performance issues and he reboots his server once every week. I think that is too much pressure on the server on its own. To my knowlege, microsoft recommends rebooting server once every month. Can some body help me out here please. Thanks.
I am a 2 node active/passive 2003 cluster. I have some maintenace where I need to shut down both of the servers at the same time.
Has anyone experience any issue in this approach?
I am planning to take the cluster offline and then shutdown the servers and bring it online after the reboot. I am also running SQL so any concerns or tips as what would be the best scenario.
I've heard rumors of best practices to include manually stopping SQL instances before doing a reboot of the system. Is this true and if so, where is this documented. I've searched all over and come up empty. So I was wondering if this was just some old DBA saying but no longer relevant?
"tempdb is skipped. You cannot run a query that requires tempdb"?
We're running a .Net web application with a SQL Server 2000 backend, and we get the error intermittently. Restarting the SQL Server service seems to fix it, as it causes tempdb to be rebuilt, but this isn't a long term solution. Any direction or hints would be greatly appreciated. Thanks! - Mike
THis is sql server 6.5 question. I have tempdb data device size default 2 MB, which has completely filled up. I am trying to expand data device to it. I created new device tempdb_data_ext (250 MB) and tried to expand tempdb data device. But everytime I do it, it ends up adding space to tempdb log device. How can I expand tempdb data device?
Hi, How can I control the growth of tempdb in SQl server.It's growing like anything. CAn I create some alerts or jobs and what those alerts/job are supposed to do? All help appreciated. Jai
Hello! This is error message I discovered in NT even viewer: c:MSSQL7DATATEMPDB.MDF: Operating system error 112(There is not enough space on the disk.) encountered.
In SQL Server error log the errors are: Error: 1101, Severity: 17, State: 10
Could not allocate new page for database 'TEMPDB'. There are no more pages available in filegroup DEFAULT. Space can be created by dropping objects, adding additional files, or allowing file growth..
Currently tempdb rezides on C drive and it's almost out of space. What should I do? Detach tempdb and then move to different drive? What's the procedure?
TEMPDB in one of our production servers does not clear up so every three to four weeks I have to restart NT. Nothing like this happens on any of the other three servers. Does anybody know where I should look at to correct the problem. I sure would appreciate it. Thanks Shashu
I have never done this before and thought I would ask. Is it possible to detach the tempdb database, move it to another drive or partition, and then re-attach it? What would be the downside or side-affects to doing such a thing?
Error : 933, Severity: 22, State: 1 Logical page 258 of the log encountered while retrieving highest timestamp in database 'tempdb' is not the last page of the log and we are not currently recovering that database.
I use sqlserver -T4022 to start my SQL Server since it will not start with out it. When I start sqlserver without the option, it tells me that
Error : 615, Severity: 21, State: 1 Unable to find database table id = 2, name = 'tempdb'.
