How To Start SQL Server When Tempdb Files Were Relocated?

Nov 22, 2005

It's been a long time since I've tried this, but I have a SQL Server that needs to be restored (including master) to a server whose drives and corresponding folders match the source server, with the exception of tempdb. When SQL Server initially starts I believe it will fail since it cannot find tempdb. I just don't recall if it fails to startup or if it starts up reporting errors and recreates tempdb in the same location as master. Does anyone recall the steps needed to point SQL Server to the new location of tempdb?

Dave

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SQL Server Admin 2014 :: Separate Data Files / Log Files / TempDB / Backups

Jan 9, 2015

I proposed on a new server that we separate Data Files, Log Files, tempDB, Backups, etc. onto separate LUNS on a SAN with High Speed Solid State Drives.I was told that with the new technology with solid state SAN's that it would decrease performance and that it did not work the same way as it did when you had RAID 5's etc.I thought that if things were cared out correctly by a SAN Administrator they would know how to configure for optimal performance.

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TempDB Log Files Are Filling Up.

Dec 28, 2006

What is the best way to fix issues with your log files in TempDB when you start to see them causing error msgs?

Thansk for your time.

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TempDB Files Gone Missing

Nov 25, 2013

I was in the process of migrating a server from one physical box to another. They are identical drive setups, same OS (2003), same SQL install (2005). Our server team did a 'PlateSpin', which copies the drives from one server to another, as long as the files are not in use. I did not reinstall SQL on the new box, i let the 'PlateSpin' tool copy everything over for me. I then stopped the SQL services on the old server and new server and copied over all of the system database (.mdf & .ldf) files. As soon as i started up the services on the new server, it looked great with one exception. The TempDB was only showing one datafile. When i queried sys.master_files, it was showing me 8 TempDB files. I tried restarting the services, but i still saw the same, only 1 file. I then tried to re-add TempDB files with the same name, but it would error saying they already existed. In turn, i could add new files with different names and they showed up fine. However, on a restart, they would not show up in the properties of the TempDB.

When i queried, sys.master_files again, i now had 16 Temp db files listed in the results. I deleted all but the original single file that was recognized out of the sys.master_files table and re-added the additional 7 files with he original names, restarted the service and then they all appeared.

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How To Drop One Of The Tempdb Files

Nov 23, 2005

Hi all, I have a tempdb that consists of 8 datafiles, tempdb_data_1 totempdb_data_8, each is 8GB. Now how can I drop 7 of them and leaveonly tempdb_data_1? Can this be done? Thanks a lot.

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SQL 2012 :: TempDB Data And Log Files On One SSD?

Mar 3, 2015

I'm having an argument with our infrastructure architect who has just gone and bought lots of SSD drives to use for our tempdb data and log files, sounds great doesn't it? There is a catch though, his plan is to add the disks to the two available slots in each blade in a RAID0+1 configuration, effectively giving you one usable drive, and adding both data and log files on to one disk.

I then pointed out that SQL Server best practice is to host tempdb data and log files on two separate drive to reduce contention. The architect then basically said that because this isn't spinning disk the issue of drive, r/w contention isn't an issue I don't agree with this and wanted to get some opinions from the community, I'm still advising that two separate disks should be used but someone just went and spent £80k ($150k) on SSDs and doesn't want to back down...

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TempDB Files On Root Of Drive

Sep 15, 2015

Documentation that supports the placement of Tempdb files on the root of a drive, i.e T: instead of T: empdb. I am positive this is not a best practice, but when challenged could not find any documentation that would support that view.

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SQL 2012 :: Splitting TempDB With Multiple Files?

May 21, 2015

So we have new servers that are going to be installed with SQL 2012 and I'm debating the wisdom of splitting tempdb with multiple files.

I know it's a myth that performance automatically improves if you split it into a number of files based on processors, but I'm debating the wisdom of putting a file on each of my data / log file drives.

For instance, I have a server with a C: drive (OS), D: drive (Data for system DBs and install of programs - 458 GB), an F: drive for user DB data files (767 GB), and a J: drive for log files (255 GB).

Obviously no files are going on C:. I'm debating on whether or not we should even leave system DBs on the D: drive given in our current 2k8 servers, we end up with Memory.dmp files over flowing the D: drives as well as .cabs and other install / update files that tend to collect on that drive over the years.

But if we leave the system DBs on D:, I'm wondering if adding a second tempdb file to F: and a third to J: will improve query performance or not.

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Deleting Extra Tempdb Log And Data Files

Jul 20, 2005

We had someone create an extra data file and log file for tempdb. Sowe currently have two data files and two log files. Is it possible todelete the newly created data and log files? If I just delete thephysical files, I assume they'll get created as soon as SQL Servergets started back up. Any help would be great, since a single dataand log file for tempdb is my goal.Thanks much.sean

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TempDb - Moving / Adding Files And Resizing

Oct 23, 2015

Have a SQL2008R2 instance on a VM where the single .mdf for the tempDb database is located on a high contention disk.  I've managed to get another 60GB disk and thought it would be a good time to move the .mdf and also increase it's size and number of files. 

The server has 12 cores and after a bit of reading I've decided that it would be best just to have four files for this database as the 1 file per core (-1) seems to be disputed.  

-- Move the existing file to the new disk and rename it.
ALTER DATABASE tempdb MODIFY FILE (NAME='tempdev', FILENAME='E:SQLData empdb0.mdf');

-- Change the size to 1GB
ALTER DATABASE tempdb MODIFY FILE (NAME='tempdev', SIZE= 1048576KB, FILEGROWTH=5%);

-- Add three new files, all with the same size & growth
ALTER DATABASE [tempdb] ADD FILE ( NAME = N'tempdev1', FILENAME = N'E:SQLData empdb1.mdf' , SIZE = 1048576KB , FILEGROWTH = 5%)
ALTER DATABASE [tempdb] ADD FILE ( NAME = N'tempdev2', FILENAME = N'E:SQLData empdb2.mdf' , SIZE = 1048576KB , FILEGROWTH = 5%)
ALTER DATABASE [tempdb] ADD FILE ( NAME = N'tempdev3', FILENAME = N'E:SQLData empdb3.mdf' , SIZE = 1048576KB , FILEGROWTH = 5%)

-- Now restart the instance.
 
Also, what are peoples thoughts on percentage growth for tempDb?  I've read that it's not recommend and yet it seems to be the norm.

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Setup And Upgrade :: Number Of TempDB Files

Aug 24, 2015

My server has two 8 core processor. Should I use 8 or 16 data files for Tempdb?

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SQL 2012 :: Alerting When Tempdb Files Have X% Free Space?

Aug 13, 2014

I have a tempdb split into 4 files (5 if you include the log).

Autogrowth is disabled on the mdf/ndf files so that they can be used round robin (1 file per logical CPU).

Is there a way to be alerted when there is x% of free space left?

I know hwo to check the free space via t-sql but want to be able to be alerted. I could run a sql job that reports the free space and send a database mail message if under x% but wondered if there was a built in (or better) method?

I also have SQL Sentry.

SQL 2012 Standard

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SQL 2012 :: Cannot Create Extra Tempdb Files Because They Already Exits

Feb 23, 2015

I was in the process of creating additional TempDB.ndf files, and received an error saying they already exist. I checked the location and it was empty, nothing to see here. So I looked in sys.master_files and there are several tempdb files listed in various locations, all of which come up empty.

So the files are listed as online in sys.master_files, but they do not exist on the server. I restarted SQL services but it did not change anything.

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Waht Is Tempdb Database Used For? And How Can We Determine What Files Can Be Deleted From It?

Jun 25, 2007

Hi, all experts here,



Thank you very much for your kind attention.



Just found that my tempdb is always full whenever I run a query against a large database. Could please any experts here give me any advices on what is tempdb database used for and how to determine what files can be deleted from it?



I am looking forward to hearing from you and thanks a lot in advance.



With best regards,



Yours sincerely,



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How Do I Prevent An Insert Into Statement To Increase Tempdb Data Files So Much

May 6, 2008

I'm running this procedure which insert into table_name(id, name.....) select id, name.... from table_name. For some reason the tempdb data file grow up to 200GB. The tempdb is set to expand unrestricted by 10%. How can I prevent that from hapening? Thanks.

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SQL 2012 :: TEMPDB High Avg Write Wait Time On Data Files

Apr 15, 2014

I am currently investigating aa high avg write time ms issue (145ms) which seems to be only occuring on the tempdb data files.I have followed the recommended setup of TEMPDB in that

1. Data files = number of physical cores
2. Data files and logfiles are on separate partitions away from the other databases.
3. Tempdb is presized and no incremental file increases look like they are happening with frequency.

We have sharepoint 2012 setup on other sql servers and with TEMPDB setup following the same guidelines, with far more Sharepoint activity on a similary specified hardware which is why its confusing.FileIO auditing on the partitions themselves shows that the FileIO is very fast on the partitions that the tempdb data file which leads me to beleive that Sharepoint may be the culprit perhaps due to excess use of tempdb with operations taking a long time to resolve.

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Linked Server To Text Files: Is Possible To Detect Changes Made To Those Files? (SQL Server 2005)

Sep 3, 2007

Hi gurus,

I've created a linked server (and set up the corresponding schema.ini file) in order to perform bulk-inserts from some CSV text files into SQL tables (from my standpoint the text files are just for reading purposes). The linked server works fine (I can select the data in the files without a problem).

Now the question: is possible to automatically detect when one or more of those files change in order to start the import process automatically? Something like having a trigger created on the CSV files Or there's no easy way to do that so I have, to say something, to create a Job that periodically checks if the files have changed programatically (say, recording each file's timestamp everytime is imported and comparing the recorded value with the current one, or whatever)?


Thanks a lot in advance!

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Tempdb Is Skipped. You Cannot Run A Query That Requires Tempdb

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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SQL 2012 :: FOR FILES Command To Delete Old Backup Files On Remote Server?

Feb 24, 2015

I have the need to delete old backup files via TSQL job. Found this solution online:

PushD "
emoteservershareDIFF" &&(
forfiles -m *DIFF*.sqb -d -1 -c "cmd /c del /q @path"
) & PopD

It works remotely if I run it via command prompt. But when I add this to a TSQL job on my remote SQL instance, it runs without deleting anything. What I'm missing?

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IS Same? (RS Start In Window Severvices V RS Start In Configration)

Mar 30, 2007



1) RS Start in Window Severvices
2) RS Start in Configration

1) and 2) Is Same?

I think that It looks like same Operation.

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Urgent, How Much The TempDB Should Be In The New Server

Dec 28, 1999

Hi,
I am installing the SQL server 7.0 as a production server and as soon as the server is started, within a week the date will be around 10 millinon rows, so I want to know how much space should I allocate for the tempdb and what should be the incremental percentage of the the tempdb(New server).

thanks in advance,
Madhu.

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SQL Server 2000 - TempDB Problem?

Jan 29, 2006

Hi,

I believe our problem is related to tempDB on the specific server but I would like to know if anybody has come across a similar issue.

We have an SQL statement similar to the following.

BEGIN TRANSACTION

CREATE #tableA

INSERT #tableA SELECT (expression A)

INSERT #tableA SELECT (expression B) WHERE (condition)

COMMIT TRANSACTION

First, let me briefly expand on the second INSERT as this may help when reading the points below.

INSERT #tableA
SELECT ...
FROM ... INNER JOIN tableB
WHERE NOT EXISTS (SELECT ... FROM #tableA WHERE #tableA.columnA = tableB.columnB)

This script works fine on all of our servers except one, which is why I believe tempDB may be involved. After an analysis of the problem, we have the following results,

- If we remove the Transaction, the script succeeds.
- If we leave the Transaction and remove either the first or second INSERT, the script succeeds.

- If we leave the Transaction and both Insert statements and remove the WHERE (condition) from the second Insert, the script succeeds.

- If we reduce the row counts from all source tables concerned by 90%, the script still does not succeed.
- The script had succeeded the week before on the server in question.

Finally, if we replace #tableA with tableA, the script succeeds.

Any help on this would be greatly appreciated.

Thanks.

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Tempdb Maintenance - SQL Server 2000

Dec 14, 2006

Can someone please explain what the tempdb database is responsible for in SQL Server 2000. The database and log file has grown extremely large and I cannot backup this table for some reason. Thanks.

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DB Engine :: Server TempDB Set On RAM Disk

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:  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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SQL Server 2008 :: TempDB Size Hovering Around 45%

Jul 27, 2015

My prod server (only default instance) is configured TempDB 1024 MB data and Log 200MB. when I run 'sqlperf logspace' it shows most of time around 45% 'log space used'. There nothing going on the instance when I ran 'whoisactive' and select * from sys.sysprocesses where dbid = 2!!!

So my questions are is this normal to see log space around 45%, how to find what what CAUSED the tempdb log space to grow 45%? Is there something to do about it?

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SQL Server 2014 :: How To Overcome From The Tempdb Spill Over

Aug 19, 2015

Here with i have attached the execution plan, In that i have tempdb spill over in sort operation. i have created index to sort even it needs temp db spill over. [URL]....

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SQL 2012 :: Blocking In Report Server TempDB

Sep 21, 2015

I am seeing select * from sys.sysprocess where blocked<>0 is always the report server

ReportServer.dbo.GetSessionData;1 is blocked by ReportServer.dbo.WriteLockSession;1

We have different reporting servers using same database.

Is it require to rebuild indexes on report server and report server temp db on daily basis?

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SQL Server Admin 2014 :: TempDB Is Full

Oct 6, 2015

Message: Executed as user: NT AUTHORITYSYSTEM. The transaction log for database 'tempdb' is full. To find out why space in the log cannot be reused, see the log_reuse_wait_desc column in sys.databases [SQLSTATE 42000] (Error 9002). The step failed in my sql server agent job i have the above error, this type of errors i got some of multiple jobs.

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Sql Server 2000 - Spid Using Most Tempdb Space ?

Jan 29, 2008

Hi There

In Sql Server 2005 sys.dm_db_task_space_usage is great for tracking down temdb space issues.

I have tempdb space issues in sql server 2000, how do i get the same info in SS2000 ? IE: What spid is using the most tempdb space ?

Thanx

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SQL Server 2005 SP2 -- Error With ASP.Net Session State Using TempDB

Mar 14, 2007

I have an ASP.Net (C# 2.0) application that has been using SQL Server 2005 Standard Edition with Service Pack 1 to hold the session state in a testing environment.  Currently, the session state is being stored in TempDB, rather than the ASPState database.  This has worked very well for us until yesterday.  We installed SQL Server 2005 Service Pack 2, as well as the Critical Update for Service Pack 2 (KB933508).  Once the SQL server was rebooted, I got the following error message when I tried to access the web application.
The SELECT permission was denied on the object 'ASPStateTempApplications', database 'tempdb', schema 'dbo'.The SELECT permission was denied on the object 'ASPStateTempApplications', database 'tempdb', schema 'dbo'.The INSERT permission was denied on the object 'ASPStateTempApplications', database 'tempdb', schema 'dbo'. 
In the web.config file for the application, I have a SQL username and password defined that can access the ASPState database.  To correct this issue, I had to give this user db_datareader and db_datawriter access to tempDB.
 
Has anyone else run across this problem, and is it related to SQL Server 2005 Service Pack 2?

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SQL Server Admin 2014 :: Transaction Log And TempDB Calculations

Mar 13, 2014

Is there a formula for calculating how expensive a transaction will be in terms of disk space used before its run. I dont want it accurate to the MB, but rough enough so I can determine how much additional space to assign to a transaction log or SAN volume.

Currently we're reindexing ~25billion rows, nothing too wide, say 12 columns consisting of 1 varchar(50) and the rest ints, bits and money.Roughly speaking if I reindex the clustered index on an int indetity, (with sort_in_tempdb) how would I calculate the the disk space used?

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SQL 2012 :: Where Does Server Store Information About TempDB Configurations

May 29, 2015

Whenever SQL Server get restarted, tempdb gets recreated with its last configuration.

let me know where SQL Server store tempdb configurations? How does it know how many Tempdb files it needs to create on restart?

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SQL Server 2014 :: Eliminate Used TempDB To Spill Data

Jul 10, 2015

I've been trying to make the following query more performant by breaking it up into smaller pieces.

SELECT MT.A3+MT.A4 AS A34,MT.A3
-- ,M.*
FROM
Master_TAB M
JOIN (SELECT M.A1,t3.A3,t3.A4,M.A6,M.A2,ROW_NUMBER() OVER (PARTITION BY A1,A6,A3,A4 ORDER BY A5 DESC) AS rownum

[Code] ....

I know that the Spill is caused by the Sort but I can't remove the sort (sort can't be done in front end). My master table had 1.7 million rows and almost 200 columns (bad design? I know but can't be changed as there's too much that would be affected) every row is little over 1KB

Here's my attempt...

-- MASTER_TAB has 1.7 million rows and 50 columns
CREATE TABLE [dbo].[tmp_ABC](
[A1] [varchar](13) NOT NULL,
[A2] [varchar](5) NOT NULL,
[A3] [varchar](4) NOT NULL,
[A4] [varchar](4) NOT NULL,
[A5] [int] NULL
) ON [PRIMARY]

[Code] ...

This is the Query that is causing the Spill (in reality I'm supposed to bring back all 200 columns fro the master table but for debug purposes I limited the columns)

Select c.A3+c.A4 as A34, c.A3, c.A1
-- M.*
from tmp_DEF c
join MASTER_TAB M on M.A1 = c.A1 and M.A2 = c.A2
order by c.A3, C.A4

if I just run the following I get no spill:

Select c.A3+c.A4 as A34, c.A3, c.A1
from tmp_DEF c
order by c.A3, C.A4

as soon as I add the Master table as a Join I get the Spill...

I read many articles, tried many suggested things (creating indexes... clustered, non-clustered) without success. Maybe I'm totally in Left Field and should enhance the performance going another route?

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