DB Engine :: How To Identify If TempDB Contention On Page Is PFS / GAM Or SGAM
Jun 23, 2015
 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_IDÂ =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 ?
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May 6, 2015
we run 2008 std edition (I believe r2 on this server, will double check) and I need to find a needle in a haystack.
I am looking at two tables and would like to learn which, if any objects on same db updates these tables.  I'd even live with any references to these tables. I already know sql agent is out of the picture. I'm looking for a static approach, not a monitoring one because its possible updates don't occur till month end.
Is there a way in sql server to query the answer to such a question using dmvs or something like dmvs?  What if I get bold and want to search all db's on this server for objects that update my two tables even across dbs?
In the mean time, i'll look at scripting all triggers and procs , and doing a search on these table names in the scripts.Â
I don't know that I've ever seen a way to script all triggers before. Procs I can easily script from the object explorer details. But I'm not sure if in explorer details--> server objects --> triggers does what I hope it does.
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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.
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Oct 23, 2015
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: Â 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.
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Sep 9, 2015
Application is throwing errors.Is there anyway to fix this with out restarting the server on a newly migrated system?
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Nov 17, 2015
I am considering turning on RCSI to prevent blocking, how do I estimate the size of tempdb?
I am monitoring current tempdb usage of space for
UserObjectsUsageKB,
InternalObjectsKB,
VersionStoreKB,
FreeSpaceKB. Â
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Jul 9, 2015
Is it available by default or it has to be Configured.Â
If yes then how to configure Tempdb in Memory for SQL 2012 SP2 CU1?Â
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Aug 18, 2015
I have a query that is using up the whole TempDB (50GB) and still failing because the disk runs out of space.
The script has SELECT FROM SELECT FROM SELECT etc. and in each select it also seems to have joins.
I can also see a few UNION and UNION ALLs.
Is this normal for one query to use up that much space?
If I wanted to make this better where would I start?
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May 19, 2015
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. Â 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.
I have also tried using the command:
ALTER DATABASE tempdb MODIFY FILE (NAME = tempdev#, FILENAME = '<new location');
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.
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May 20, 2015
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.
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Aug 3, 2015
Could a simple update statement on a user database ever caused space usage in tempdb? Â 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.
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Jun 15, 2015
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.
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Apr 22, 2015
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?
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Jul 15, 2015
We have SQL Server 2012 EE SP2 server that is getting hit by reports that time-to-time use up to 300GB of tempdb.
It's happening because our clients can use 'bad' parameters for some reports.
Is there a way to autokill sessions that overuse tempdb (for example, if a session uses more than 15Gb in tempdb)?
Killing can happen immediately or after regular check (5 min for example).
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May 9, 2004
"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."
I get this error when running a query on another database. But why?
Both data and transaction files on TEMPDB are set to "automatically grow file" and "unrestricted file growth" and there is 70GB of free space on the disk drive. Shouldn't the files just grow? Why would this happen?
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May 22, 2004
I get the following error when doing a variety of basic queries on other databases:
"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."
This doesn't make any sense since they are set to auto grow and there is plenty of disk space to do so.
Both data and transaction files of tempdb are set to:
"Automatically grow file" is checked
"Maximum file size" is set to "Unrestricted file growth"
Growth rate of 10%
Both tempdb data file and transaction file are on D: but all drives have ample space:
c:25 GB free
D:69 GB free
E:175 GB free
sp_spaceused returns the following for tempdb:
namesizeunallocated space
tempdb4.00 MB1.45 MB
reserveddataindex_sizeunused
568 KB176 KB304 KB88 KB
sp_helpdb returned for tempdb:
tempdb
4.00 MBsa2Apr 23 2004Status=ONLINE, Updateability=READ_WRITE, UserAccess=MULTI_USER, Recovery=SIMPLE, Version=539, Collation=SQL_Latin1_General_CP1_CI_AS, SQLSortOrder=52, IsAutoCreateStatistics, IsAutoUpdateStatistics80
This is with SQL Server 2000 (Personal Edition)
Product Version: 8.00.760 (SP3)
Is this some strange limitation of Personal Edition? Is it worth upgrading to Standard Edition?
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Oct 18, 2007
Hello, I have an issue with a process that blows up because of the following error.
Executed as user: batchloader. Updated 0 existing Company records [SQLSTATE 01000] (Message 0) Inserted 0 new Company records [SQLSTATE 01000] (Message 0) Inserted 0 new EntityIdXref records [SQLSTATE 01000] (Message 0) Updated 977 existing CompanyCustomerAttr records [SQLSTATE 01000] (Message 0) Inserted 0 new CompanyCustomerAttr records [SQLSTATE 01000] (Message 0) 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. [SQLSTATE 42000] (Error 1101). The step failed.
Ok I am going to be typeing some really bad practices(I just started here 3 weeks ago.)
There is 23.6 gig free on my log drive. The disk is not running out of space and there are no disk errors in event viewer. The process in question calles 2 procs. These 2 proces load files from the filesystem and bulk load them into #temp tables. Then select's from these tables are issued using criteria from a static table. There are around 700000 rows being inserted into the #temp tables and no indexes are being created so very large table scans going on. Also there are some cursors being called to row by row minipulate the records and in the cursor it calles fucntions using cursors. There are thousands of files being processes everyday by several different jobs. All of the processes are written the same way. We have the tempdb set to auto grow by 10 % and the initial size is 3.5 gig. There are 3 to 4000 tables in the database and 90 % of them are being created on the fly to be used by this process and yes once again there are no indexes created on the on the fly tables. We have only one Filegroup on the server default.
I believe that takeing some of the objects and moving them to there own filegroup will help this issue. Every month we take on up to 800000 new records to process on top of what we allready do. So we use cursors cursors cursors temp objects with no indexes and massive recordsets and doing sorts on massive records sets. I am working with development to show them how and where to index but this will take time. I need a quick solution. Any thoughts any questions? The box has 4 gig of ram.
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Mar 19, 1999
Has anyone come across the problem of transactions not being able to write to the transaction log while a 'dump transaction' operation is in progress and therefore causing the transaction to timeout??
Is there any way of eliminating the timeouts/contention??
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Jan 22, 2015
What is the impact of fragmentation when my tables fragmentation is 99% but page count is 300 only?
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May 27, 2015
I have few servers that are VM and different version of SQL Severs (2008 Express/Standard, 2012, or 2014 Enterprise) and seems all of them have same issue that when I am querying "sys.dm_os_performance_counters" for "[object_name] LIKE '%Buffer Manager%' AND [counter_name] = 'Page life expectancy'" I am getting very big number (Ex, above 100K or some servers 1M).Is this number seems fine or acceptable?Â
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Apr 29, 2008
All,
We are experiencing some problems when running the same package on multiple threads of a C# application concurrently. The package instances seem to share a Dts.Variables collection.
I have created a test application and package to reproduce the issue. The package is very simple. It has two variables - Instance (Int32) and Content (string). The test application runs two concurrent threads that run through 25 iterations running the package. Each thread loads the package, sets the instance, and then runs the package. The package then takes the instance, sticks it in the Content variable and then writes it to a file called "FileX" where X is the Instance. Thread 1 sets the instance from 1 to 25, thread 2 sets it from 26 to 50. The test execution results in about 15% of the files containing the incorrect "instance content". That is, I'll see "42" in the file named "File14", or something along those lines. This tells me that the variables are being overwritten.
I ran another test where I created a copy of the package, so the code is identical, but the VersionGUID is different. Running the thread test application always succeeds. There is no file name/content mismatch. I then ran another test where I manually edit the XML of the package to change the VersionGUID before the package is loaded (by calling LoadFromXml). Again this never fails.
Changing the VersionGUID may work for us, but it is a total hack. Has anyone else experienced this or have any other solutions? Any thoughts on manually updating the VersionGUID to get around this problem? I hate doing this, but we are getting desperate.
Thanks in advance,
Rob
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Feb 28, 2008
Hi - have 150,000,000 row table receiving BULK INSERTS all day - I have also found out my client likes to performan READ opertions simultaniously against this table with of course chronic contention issues.
Need to provide a quick-fix, will index views enable me to abstact the reporting data away from the BULK INSERT table and is there any connection issues between the base table and the Index View?
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May 22, 2015
I measure PLE on my server and insert them every minute into a table. Now, when I look into the table I just dont know how to interpret the following data. I dont understand how is that possible. It's an sql server bug? or? How to interpret that data?Â
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Sep 12, 2014
Our server administrator forwarded some messages from SCOM that indicate:
SQL DB Engine 2012 Page Life Expectancy and Buffer Cache Hit Ratio is too low
When I logged into the offending server, I could not find anything in the SQL Log File that indicates this.
I was wondering how did SCOM identify this issue - where in SQL Server would this have been reported to SCOM?
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Nov 11, 2015
I have created one reports but all the records are displaying on one page.find a solution to display the records page by page. I created the same report without group so the records are displaying in page by page.
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Jul 14, 2004
Has anyone seen the SQL Server error:
"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
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Nov 28, 2006
Hello I have a project that uses a large number of MS Data access pages created in Access 2003 and runs on MS SQL2005.
When I am on lets say my client, (first page in a series) data access page and I have completed the fields in the (DAP), I am directing my users to the next step of the registration process by means of a hyperlink to another Data access page in the same web but in a linked or sometimes different table.
I need to pass data entered /created on the first page to the next page and populate the next page with some data from the first page / table. (like staying on the client name and ID when i go to the next page)
I also need the first data access page to open and display a blank or new record. Not an existing record. I will also be looking to creata a drop down box as a record selector.
Any pointers in the right direction would be appreciated.
I am some what new to data access pages so a walk through would be nice but anything you got is welcome. Thanks Peter€¦
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Oct 16, 2006
The following objects are placed on the Report body of the Report pane of SQL Server 2005 Reporting Services :
<textbox: expression1>
<textbox: expression2>
<table:table1 with at least 30 columns and 30 expressions>
<textbox: string1> - considered as the Title in the Footer section of the report
<texbox:string2> <textbox:expression3>
<textbox:string3> <textbox:expression4>
<textbox:string4> <textbox:expression5>
<textbox:expression6>
I can't find any explanation why is it string1 and string 2 of the footer section of my report displayed separately from the expression3 which is aligned on it and the rest of the object on the second page.
The expected design is that all Footer items should be displayed together of whether it is placed on the first page or on the last page.
As a workaround of this, I converted string 1 into an expression (Added = and enclosed the string with double quote).. As a result, all of the items in the Footer section are now placed together on the last page of the report.
I also remember one of the issue I encountered before where the Footer items where placed together on the first page and still have space at the bottom of the page, but then expression 6 is forced to display (alone) on the last page of my report.
I can't find any discussion related to this, I wish somebody could give me an idea why RS behaved like this.
Thanks in advance
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Feb 14, 2008
Fit an intere table in same page without page break for save the excel export.
My table has a Group for order my dates.
I need to have the intere table in the same page, i don't care about blank space at the end of the page.
I can't use the page break beacuse i need an excel export in a unique sheet..
I have tested.. every page break..you'll have a different sheet in your excel export
I need something like this
page 1
Zone
1
2
3
4
5
6
7
7
8
9
..
page 2
Zone
1
2
3
4
5
6
7
7
8
9
..
but an unique sheet in the excel export
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Jul 17, 2007
Hello,
If I have a report that includes a page header, the report viewer will render the report at the full width, but if I hide the page header and show only the body it will use the absolute width of the report.
I have a 7" wide report, with .75" borders set on each side.
Interactive & Print size are set to 8.5x11
Changing these sizes has no effect on the behavior of the viewer, which appears to ignore them.
When I view this report in the local viewer the contents fill the window if there is no page header.
If I enable the page header then the report is drawn at 8.5" wide, leaving a _big_ white border on the right side.
Any comments or workarounds that anyone knows? I know the local viewer is not a standard configuration (at least it seems) but it is what we need to use.Thanks,//Andrew
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Sep 21, 2006
Hi, I wanted to know that can we access a webpagefrom a store procedure in sql server 2000 like we run a exe file from sql server. Bye.
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Jul 20, 2007
Hi,
I issued this command on Tempdb but it doesnot shrink the file.
dbcc shrinkfile (tempdev_3,1)
go
Messages:
-----------------------------------------------------------------------------------------------------------
DBCC SHRINKFILE: Page 4:11283400 could not be moved because it is a work table page.
-----------------------------------------------------------------------------------------------------------------------------------------------
I have checked that there are no tables associated with any user in tempdb. Any help is appreciated.
Regards,
Razi
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Apr 16, 2007
How can I print a field that is in the dataset on each page? I added a textbox in the Page Header and use =Fields!ProjectName.value in the value property. I got an error "Fields cannot used in page header and footer."
How can I have the table header shows on each page? Currently if the data goes to the second page, there is no table header.
Thanks.
DanYeung
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