Rightclick the database, go to properties, click options. Execute sql server dbcc shrinkfile without causing index. We had some problems overnight and my tempdb data file went up to 22gb. Mar 25, 2014 to shrink the log in ssms, right click the database, choose tasks, shrink, files. Now were going to delete some of our data and therefore leave us with free space to reclaim. The page also details the service account requirements for redgates own sql monitoring software, but the sql user permissions part should be similar for sql server monitor. No, actually it is notoriously bad for fragmenting the data. Ms sql server dbcc shrinkfile not shrinking data file. In this instance my tempdev file is 10mb 1280 8 10240 kb how to shrink tempdb using dbcc shrinkfile.
Over time, with the use of sql server, the database transaction log file can grow quite large. To shrink the log in ssms, right click the database, choose tasks, shrink, files. The sql server database detach and attach method to move a database. See the permissions section of dbcc inputbuffer on msdn this requires sysadmin. Are there any in particular that youre looking to use. This is another reason not to repeatedly shrink the database. If you have worked with trace flags before, you probably know that you can apply them as a startup parameter for the sql server service. I have written in a display of the size of the log file before and after the shrink, and the process works wonderfully so there is actually a use.
A shrink operation does not preserve the fragmentation state of indexes in the database, and generally increases fragmentation to a degree. Sep 08, 2007 to fix the fragmentation, rebuild both indexes. You may find the below script to only generate the shrinkfile dbcc commands for all databases except system databases. He has authored 12 sql server database books, 33 pluralsight courses and has written over 5100 articles on the database technology on his blog at a s. How to auto shrink log file on sql 2016 always on availability groups. You run the dbcc checkdbmaster command on a computer that is running sql server 2005, sql server 2008, or sql server 2008 r2. Dbcc shrinkdatabase transactsql sql server microsoft docs. Use dbcc shrinkfile truncate to remove any easy excess space for all. The data file is still 22gb but the shrink dialogue reckons it has 495% free space. Shrinking your database usingdbcc shrinkfile sqlshack. The fun part being that in production you likely have no real idea whether the space you want to reclaim is at the start, middle, or end of the data file. Soon after the clean up i use a dbcc shrinkfile to release the freed up space. That fixes the fragmentation, but now the data file is using almost twice the space necessary.
Dbcc shrinkfile, as the name implies, shrinks files not databases. Then, use the dbcc shrinkfile statement to shrink the transaction log file. February 15, 2016 sql server, sqlbak omelchenko alexander the dbcc shrinkdatabase is used when it is necessary to shrink the size of the log and data files in a particular database. Used pages in the files area to be freed are moved to free space in the files kept areas. Go truncate the log by changing the database recovery model to simple. Dbcc shrinkfile, as the name implies, shrinks files not databases, and in this.
It is telling me i dont have permissions on these databases, but i am the administrator using. The following steps are confirmed to work on sql server 2005. Sql server shrinkdatabase for every database in the sql. Used pages in the file s area to be freed are moved to free space in the file s kept areas. If you are assigned a task to reduce the log file size of sql server which is causing some space issues or because of this some other program may be. Nov 08, 2016 use dbcc shrinkfile and set a specific, targeted size for the file youre shrinking. On the shrink file window, change the file type to log. Shrinking the database causes heavy fragmentation of the tables and reduces the performance.
Recently, i read somewhere that a shrinkfile shouldnt be. Dbcc shrinkdatabase transactsql sql server microsoft. Below query can be used to check the index fragmentation on the given database and given file group. Shrinking sql server data files best practices, and why. The user account that you use to run the command is not assigned to the sysadmin fixed server role or is not mapped to the dbo user role. Dbcc shrinkdatabase your surveillance database name go.
Use dbcc shrinkfile and set a specific, targeted size for the file youre shrinking. The following example shrinks the log file in the adventureworks database to 1 mb. Gerald britton is a senior sql server solution designer, author, software developer. Shrinking your database using dbcc shrinkfile sqlshack. Shrinking an ms sql database mdf file after a truncate or. This worked fine for shrinking the log, but of the 4 datafiles that were created 2 shrank successfully and 2 remain unchanged.
You cannot shrink filestream files like data file or log file. Apr 10, 2015 this is the one time that we find it very important to clean up after ourselves and not leave a 15gb log file hanging around, so we do a dbcc to shrink the log file at the end of the job. Mar 29, 2017 in sql server 2005, a shrink operation dbcc shrinkfile tries to shrink the specified transaction log file to the requested size immediately. Mostly there are permission issues when you are having error while. Error while running dbcc shrinkdatabase tempdb with no. You will notice that just changing the recovery model to simple will not release the space back to the os. The following code shrink the log for databases in full recovery mode. You needed to know where the dbcc shrink operation is currently at or if its even doing anything so that you can cancel if it doesnt look like it will finish in time. According to a page i found on redgates site, these should be the requirements for a sql user to monitor a sql instance. If so, run dbcc shrinkfile 2 and examine the free space again. Dbcc showfilestats 3363 extents total, 1697 used 215 mb total, 106 mb free so, shrink the database to release the wasted space back to the os. Jul 25, 2008 pinal dave is a sql server performance tuning expert and an independent consultant.
Dbcc shrinkfile transactsql sql server microsoft docs. How can i reduce the size my databases sql log file andor reduce the size of. It will take a long time to complete, but management. Dbcc shrinkfile not shrinking data file jan 31, 2002. The version of sql used for the tutorial is sql server 2008 r2. If you see no change, try backing up the log first and try the shrink again.
In sql server query analyzer run the following query make sure to. You should do a reorg after the shrink is complete. But before you start off with running the dbcc shrinkfile commands. Dec 23, 2010 you run the dbcc checkdbmaster command on a computer that is running sql server 2005, sql server 2008, or sql server 2008 r2. Watch your backup jobs, and make sure theyre succeeding and not taking way longer than normal. Prevent shrink for specific data files sqlservercentral. This worked fine for shrinking the log, but of the 4 datafiles that were created. Sometimes you may not able to shrink a log file till, after the truncation of the next log. To answer the question, yes, we can very well modify the script in the post to shrink the log files. Plan to leave empty space in your data files to allow for growth over the next year, and to allow index rebuilds to work if needed after the shrink is done. The first parameter in the dbcc shrinkfile command denotes the file which you want to shrink and the log file is defined by the numeric. Dbcc shrinkfile does not retain the index fragmentation and could possible make it worse.
To shrink the transaction log file manually under the full recovery model, first back up the transaction log file. Dbcc shrink is not a good practice, it leads index fragmentation. To shrink one data or log file at a time for a specific database, execute the dbcc shrinkfile command. Ive run it after backup log truncate only, and it has shrunk the ldf file from 10gb to 900mb fine.
If you really want to run this because you know better, then use a stored proc with execute as. How to shrink the transaction log file in sql server 2005. A common mistake when reclaiming database data file space is using dbcc shrinkfile without specifying the truncateoly argument. I used to own the shrink code, so i know what im talking about. Sql server will by default perform a notruncate which will move data pages from the end of the file to any free space at the beginning of the database data file. All databases need some free space to execute the necessary operations. It was only using about 170mb so i used the gui to shrink it back to 250mb. So if given file is restricted then dynamic sql of shrink will not be executed in the flow. Dbcc shrinkfile doesnt shrink a file past the needed stored data size. To reduce the size of physical log files, log shrinking process is used as log truncation does not reduce the physical log storage size. Permissions for both dbcc shrinkdatabase and dbcc shrinkfile are. Consider the following information when you plan to shrink a file. Dbcc shrinkfile shrinkdatabase a severe error occurred.
However, shrinkfile file is not advisable in all situations, i would suggest to take that option with extreme case. How to clear sql server transaction log file with dbcc shrinkfile. A shrink operation is most effective after an operation that creates lots of unused space, such as a truncate table or a drop table operation. Shrinking an ms sql database mdf file after a truncate or big delete i am not a dba and we dont have a dedicated one at our company therefore when i had a database file with a huge table containing 80 million rows of data taking up 35 gb i needed to remove it. Mar 24, 2014 tutorial demonstrating how to shrink a sql server database log file using sql server management studiossms. Dbcc shrinkfile nmyfiletablefs, emptyfile conclusion. To truncate only the data file, use dbcc shrinkfile. This should be reserved for highly privileged users to run in a few rare circumstances.
The syntax is as follows and the operation does not require a restart of the sql server service. This document contains official content from the bmc software knowledge base. Dbcc shrinkfile for filestream containers requires emptyfile option and does not allow any other options. After shrinking, it seems that rebuilding indexes is necessary. Howto shrink mssql db and transaction logs without admin. Tutorial demonstrating how to shrink a sql server database log file using sql server management studiossms. Dbcc shrinkdatabase operations can be stopped at any point in the process, and any completed work is kept. Run dbcc sqlperflogspace and see whether or not there is a lot of free space in your log file. Sradhanjali sahoo replied to sagar p on 18mar10 02. Browse other questions tagged sqlserver sqlserver2008 dbcc or ask your own question. You can also choose to either release unused space, reorganize pages before releasing unused space, or empty file by migrating the data to other files in the same filegroup. To meet up with the sla, we regularly either delete a lot of records from a table or drop the tables on the whole. Pinal dave is a sql server performance tuning expert and an independent consultant.
When i change targent size to 200, it says cannot shrink file 2 in database dbname to 25600 pages as it only contains 14048 pages. Well, this is another reason not to shrink the database. I replanned my usage of the table and decided that it would only keep a days worth of data instead of every day going back 3 years. Hi, i was wondering exactly what dbcc shrinkfile does.
How the stack overflow team uses stack overflow for teams. Dbcc shrink command will be executed as dynamic sql statement in the wrapper sp. So, there is a lot of free space available inside the database. If dbcc opentran indicates that your oldest active transaction is a replicated one and it has been open for a significant amount of time, this may be your problem. Shrink the size of the database data and log files. Well, that is all well and good until you realize that for them to take effect, you have to restart the service. Things to keep in mind while shrinking transaction log files. In sql server 2005, a shrink operation dbcc shrinkfile tries to shrink the specified transaction log file to the requested size immediately. Dec 27, 2011 in this instance my tempdev file is 10mb 1280 8 10240 kb how to shrink tempdb using dbcc shrinkfile. If my current log file is in use, how can i find who is using it and stop using then do the shrink operation. This is the one time that we find it very important to clean up after ourselves and not leave a 15gb log file hanging around, so we do a dbcc to shrink the log file at the end of the job. The last thing you want is allowing a normal user to run dbcc shrinkxxx.
The dbcc shrinkdatabase is used when it is necessary to shrink the size of the log and data files in a particular database. Shrink the size of the current database data log file or empty a file by moving the data. Mar 31, 2017 dbcc traceon, dbcc traceoff, and dbcc tracestatus. To allow the dbcc shrinkfile command to shrink the file, the file is first truncated by setting the database recovery model to simple. Feb, 2016 check progress of dbcc shrinkfile posted in uncategorized by sanz you needed to know where the dbcc shrink operation is currently at or if its even doing anything so that you can cancel if it doesnt look like it will finish in time. Dbcc shrinkdatabase testingshrink, 10 shrink to 10. The correct syntax to shrink file stream is given below. However some cases dbas needs to shrink data or log files. In the first database were going to remove all data pages at the end of the data file, but in the second database were going to remove the same number of data pages but at the beginning and middle of the data file leaving some at the end this will also generate some log records, which will be.
To shrink all data and log files for a specific database, execute the dbcc shrinkdatabase command. How to reduce the size of the sql database andor log file bmc. This also applies to dbcc checkdb on a big database. Options to move a big sql server database to a new drive with. If so, run dbcc shrinkfile2 and examine the free space again. Using dbcc queries through sql server tools, you can force a resize of the database transaction log. If you tempdb files have grown large do to some unusual activity, you can shrink those using dbcc shrinkfile or by restarting sql server. Before shrinking the log file, it better to backup your transaction logs, as shown below. The process of shrinking log files involves occupying unoccupied spaces in the front of file by moving pages located in the end of file, thus recovering space. Below query can be used to check the index fragmentation on the.