I need to empty an LDF file before sending to a colleague. How do I force SQL Server to truncate the log?
In management studio:
Don't do this on a live environment, but to ensure you shrink your dev db as much as you can:
Right-click the database, choose Properties, then Options.
Make sure "Recovery model" is set to "Simple", not "Full"
Click OK
Right-click the database again, choose Tasks -> Shrink -> Files
Change file type to "Log"
Click OK.
Alternatively, the SQL to do it:
ALTER DATABASE mydatabase SET RECOVERY SIMPLE
DBCC SHRINKFILE (mydatabase_Log, 1)
Ref: http://msdn.microsoft.com/en-us/library/ms189493.aspx
if I remember well... in query analyzer or equivalent:
BACKUP LOG databasename WITH TRUNCATE_ONLY
DBCC SHRINKFILE ( databasename_Log, 1)
For SQL Server 2008, the command is:
ALTER DATABASE ExampleDB SET RECOVERY SIMPLE
DBCC SHRINKFILE('ExampleDB_log', 0, TRUNCATEONLY)
ALTER DATABASE ExampleDB SET RECOVERY FULL
This reduced my 14GB log file down to 1MB.
For SQL 2008 you can backup log to nul device:
BACKUP LOG [databaseName]
TO DISK = 'nul:' WITH STATS = 10
And then use DBCC SHRINKFILE to truncate the log file.
backup log logname with truncate_only followed by a dbcc shrinkfile command
Since the answer for me was buried in the comments. For SQL Server 2012 and beyond, you can use the following:
BACKUP LOG Database TO DISK='NUL:'
DBCC SHRINKFILE (Database_Log, 1)
Another option altogether is to detach the database via Management Studio. Then simply delete the log file, or rename it and delete later.
Back in Management Studio attach the database again. In the attach window remove the log file from list of files.
The DB attaches and creates a new empty log file. After you check everything is all right, you can delete the renamed log file.
You probably ought not use this for production databases.
Related
I am having a huge database on one of my drives, Now the size of the database is increased, Even now its completely full, I got the back up of the database and then i tried to delete the records to free the space, As i was deleting records i got error regarding transaction log is full, I am having only mdf and ldf file in this drive, that is why i am unable to free more space and now i can not even perform simple queries due to the space issue. What should i do now, Where from i can clear the ldf file? and how can make my db to run smoothly again.
if I remember well... in query analyzer or equivalent:
BACKUP LOG databasename WITH TRUNCATE_ONLY
DBCC SHRINKFILE ( databasename_Log, 1)
If it's not a production database:
Set the recovery model to simple.
ALTER DATABASE DatabaseName SET RECOVERY SIMPLE
For all databases you can shrink them:
USE [Databasename]
DBCC SHRINKDATABASE(N'Databasename' ) --shrink the database
DBCC SHRINKFILE (N'Databasename' , 0, TRUNCATEONLY) --shrink the mdf file
DBCC SHRINKFILE (N'Databasename_Log' , 0, TRUNCATEONLY) --shrink the ldf file
Also make sure the database autogrowth is not set in % .
Right click on the database in SSMS => Properties => Files => Autogrowth
I have been created new database and the log file groth very past, and I get error mesaage that the log is full due to 'BACKUP'.
I looked in the differences between this Database and other databases in the SERVER, and I seen that in all databases log_reuse_wait is 0 and log_reuse_wait_desc is NOTHING and in my database log_reuse_wait is 0 and log_reuse_wait_desc is LOG_BACKUP.
I want to change this property in my database to 0 and NOTHING.
How can I do that?
This is a read-only status variable. It tells you why the log cannot be truncated at this point.
You have to remove the cause of that condition instead of just changing the value (which isn't even possible).
Either backup the database log or switch to SIMPLE recovery mode. You should probably read a little on both just to understand the implications.
David W.'s script did not quite work for me. (SQL Server 2008 r2)
I needed to modify it slightly. Using the script as is I got the message that there was no such file for database [master]. Alter the DATABASE as David W. recommends and then switch to the target database and run the DBCC SHRINKFILE() command.
Also the first argument to DBCC SHRINKFILE() must be the logical name of the database log file, which is represented in the following script as logical_file_name_for_LOG
USE [master]
GO
ALTER DATABASE <db name> SET RECOVERY full
GO
ALTER DATABASE <db name> SET RECOVERY SIMPLE WITH NO_WAIT;
GO
USE [db name]
GO
DBCC SHRINKFILE('<logical_file_name_for_LOG>', 0, TRUNCATEONLY)
i found the solution.
even the database is in SIMPLE mode is wait to BACKUP_LOG, so you need to change the recovery mode to FULL and then back to SIMPLE with no wait
USE [master]
GO
ALTER DATABASE <db name> SET RECOVERY full
GO
ALTER DATABASE <db name> SET RECOVERY SIMPLE WITH NO_WAIT;
GO
USE [db name]
GO
DBCC SHRINKFILE('<log file name>', 0, TRUNCATEONLY)
I know this is old, but the answers are wrong.
If the database has recovery mode FULL and that is intended, then do not change it to simple.
The log_reuse_wait_desc says what the state is before the log can be reused or shrinked. In this case it is LOG_BACKUP, meaning that, to shrink the transaction log, you need to backup the transaction log first and shrink it or backup the log and let the SQLServer reuse the log space.
A description of the log_reuse_wait_desc states can be found here
In my local C: drive I have a ldf file for a database that is hosted on one of our servers. I have a local copy of one of the databases that is 1 gb and a ldf (log file) of that database that is 16gb. It is eating up a lot of my local space on my hard drive. I would like to truncate that file. A lot of what I read online is don't, but it seems that they are talking about files on the server that the database is on. That isn't the case here, it is on my local machine.
The location of the file on my machine is:
C:\Program Files\Microsoft SQL Server\MSSQL10_50.MSSQLSERVER\MSSQL\DATA
How come I have a copy of that log file locally and also that database locally?
How would I go about truncating this file?
Thanks!
Go to the Object Explorer pane in SSMS and right click on the database in question. Choose tasks -> shrink -> files. Change the file type option to Log, click the "Reorganize pages before releasing unused space" option, and set the value to 1 MB. Hit OK.
If this doesn't work, check to see if your database is set up with a Full database recover model. Right click the database and go to properties. Choose Options, and check the Recover model option. Set to simple (if you can!!!), then shrink the logs.
The another option you can try is to use WITH TRUNCATE_ONLY:
BACKUP LOG databasename WITH TRUNCATE_ONLY
DBCC SHRINKFILE ( adventureworks_Log, 1)
but don't try this option in live environment, the far better option is to set database in simple recovery. see the below command to do this:
ALTER DATABASE mydatabase SET RECOVERY SIMPLE
DBCC SHRINKFILE (adventureworks_Log, 1)
work on SQL Server 2000.i have CustomerDetails_Data.MDF file .from this file i want to take all information on my database .How to do?
You will need to attach the .mdf data file to a database in SQL Server. Then you can simply query the information.
If you just have an .mdf file (and no log file .ldf), follow these steps to create a Database from your lone .mdf file:
Create a new database with the same name and same MDF and LDF files
Stop sql server and rename the existing MDF to a new one and copy the
original MDF to this location and
delete the LDF files.
Start SQL Server
Now your database will be marked suspect 5. Update the sysdatabases to
update to Emergency mode. This will
not use LOG files in start up
Sp_configure "allow updates", 1
go
Reconfigure with override
GO
Update sysdatabases set status = 32768 where name = "BadDbName"
go
Sp_configure "allow updates", 0
go
Reconfigure with override
GO
Restart sql server. now the database will be in emergency mode
Now execute the undocumented DBCC to create a log file
DBCC REBUILD_LOG(dbname,'c:\dbname.ldf') --
Undocumented step to create a new log
file.
(replace the dbname and log file name
based on your requirement)
Execute sp_resetstatus <dbname>
Restart SQL server and see the database is online.
You need to attach the .mdf data file to SQL Server, and SQL server will automatically generate a new LOG file, after that you can pass any query to the database...
What format do you want to extract the information to? You could write sql scripts against it, or use bulk copy.
I have an MDF file and no LDF files for a database created in MS SQL Server 2005. When I try to attach the MDF file to a different SQL Server, I get the following error message.
The log cannot be rebuilt because there were open transactions/users when the database was shutdown, no checkpoint occurred to the database, or the database was read-only. This error could occur if the transaction log file was manually deleted or lost due to a hardware or environment failure.
I would like to accomplish any one of the following options:
Attach the database without data loss (unlikely but would save me some time).
Attach the database with data loss (whatever transactions were open are lost).
Recover the schema only (no data) from the MDF file.
What SQL commands can I try to get my database going again?
I found the following document on Experts Exchange.
patrikt:
You will have data loss but it can be done.
1. Detach database and move your mdf to save location.
2. Create new databse of same name, same files, same file location and same file size.
3. Stop SQL server.
4. Swap mdf file of just created DB to your save one.
5. Start SQL. DB will go suspect.
6. ALTER DATABASE yourdb SET EMERGENCY
7. ALTER DATABASE yourdb SET SINGLE_USER
8. DBCC CHECKDB (yourdb, REPAIR_ALLOW_DATA_LOSS)
9. ALTER DATABASE yourdb SET MULTI_USER
10. ALTER DATABASE yourdb SET ONLINE
Here are details that cover parts 2) and 3) in case re-creating log doesn’t work which can happen if MDF file is corrupted.
You can recover data and structure only by reading MDF file with some third party tool that can de-code what’s written as binary data but even with such tools you can’t always do the job completely.
In such cases you can try ApexSQL Recover. From what I know this is the only tool that can do this kind of job but it’s quite expensive.
Much better idea is to try to recover these from any old backups if you have any.
FROM a post at SQL Server Forums Attaching MDF without LDF:
If you want to attach a MDF without LDF you can follow the steps below
It is tested and working fine
Create a new database with the same name and same MDF and LDF files
Stop sql server and rename the existing MDF to a new one and copy the original MDF to this location and delete the LDF files.
Start SQL Server
Now your database will be marked suspect 5. Update the sysdatabases to update to Emergency mode. This will not use LOG files in start up
Sp_configure "allow updates", 1
go
Reconfigure with override
GO
Update sysdatabases set status = 32768 where name = "BadDbName"
go
Sp_configure "allow updates", 0
go
Reconfigure with override
GO
Restart sql server. now the database will be in emergency mode
Now execute the undocumented DBCC to create a log file
DBCC REBUILD_LOG(dbname,'c:\dbname.ldf') -- Undocumented step to
create a new log file.
(replace the dbname and log file name based on ur requirement)
Execute sp_resetstatus
Restart SQL server and see the database is online.
UPDATE: DBCC REBUILD_LOG does not existing SQL2005 and above. This should work:
USE [master]
GO
CREATE DATABASE [Test] ON
(FILENAME = N'C:\MSSQL\Data\Test.mdf')
FOR ATTACH_REBUILD_LOG
GO
have you tried to ignore the ldf and just attach the mdf:
sp_attach_single_file_db [ #dbname = ] 'dbname' , [ #physname = ] 'physical_name'
i don't know exactly what will happen to your open transactions (probably just lost), but it might get your data back online.
-don
See here : Rebuild master and restore system databases from complete disk failure which has a very nice explanation
Just had this problem myself, but none of the above answers worked for me.
But instead, I found this which worked a treat and so I thought I'd share this for everyone else:
http://www.kodyaz.com/articles/sql-server-attach-database-mdf-file.aspx
Found a another way that works completely:
Create new database with same name to default database location.
Stop SQL server.
Copy old mdf file to overwrite newly created mdf file and delete new ldf file
Start SQL Server, database will be in emergency mode
Detach the emergency mode database
Copy original ldf file to default database location (where new LDF file as created and deleted under step 3 above.
Attach the database MDF file.
I got a working database after trying all of the above that failed for me.
I hope it is easy to do so,
Open SQL Server
Click New Query
Execute the following query
sp_attach_single_file_db #dbname='dbname',#physname='C:\Database\dbname.MDF'
Where dbname is you want to show in Object Explorer, where #physname is the local filepath location of your mdf file.
Hope it will help someone, i done by above, got both structure and also data.
Tested in Sql Server 2000 and 2008. In Sql Server 2000 it is not working, but works perfectly in 2008.