Why Truncate / Shrink Log Files Work The Way They Do???
Nov 13, 2007
I've been having some trouble keeping my log file size under control due to some off-hours data loads. Currently, while updating some certain tables, the data base is still in "Full" mode, which of course makes the log file grow accordingly.
Today I figured out that, given the current scenario, in order to shrink the log file back down (after the table update), I have to (1) backup the log file, (2) shrink the log file, (3) backup the log file again, and (4) shrink the log file again. My question is: why do I have to do two iterations of backup / shrink? Why does it not work with one iteration? I just want to better understand the architecture and functionality.
Also, would there be a better way for keeping the log file size under control? If I switched the database to "Simple" mode to load the data, would that work any better?
If so, what might be the best methodology?
Thanks in advance for any responses.
Kent Rothrock
Highland Mapping, Inc.
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Apr 17, 2002
A customer on SQL7 has a 40GB tempdb (which is usually 2-5GB) which has filled the drive. ShrinkDb/ShrinkFile do nothing as the db has only 2GB of free space. How can I truncate the data or blitz tempdb and create a new (2-5GB) one (Stopping the server, deleteing the .mdf, starting the server creates a new tempdb with the same size as the old one!)
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Aug 28, 2007
Is it possible to truncate Transaction Log and Shrink DATABASE while the database is being used by users or the database becomes unuvailable during this operations?
Thank you.
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Aug 18, 2015
We have a SQL server 2012 database with size 200mb and Transaction Log has gone up to 34GB.
We have SQL server Mirror is enabled and principal database is running with Full Recovery Model.
How can I truncate/Shrink Log files? Will it impact on existing mirroring setup? I am very much new to SQL server.
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Apr 30, 2015
I would like to know what happens if i shrink the database with truncate only option and do a full backup or transaction log backup ? are the full backup or transaction log backup valid? I know that the performance of the database is bad if i shrink the database. What happens to full backup or transaction log backups?
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May 15, 2006
We are using SQL Server 2005 (SP1). I have created a maintenance plan that backs up up the datebase every night. The problem is that the transaction log is continuing to grow. I have been told that a full backup will automatically truncate and shrink the transaction log. However, this is not happening. How can I truncate and shrink the transaction log after a full backup as part of our maintenance plan. Thank you.
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Aug 8, 2000
I have been unsuccessful in getting the Backup Log with
No Truncate option to work.
Any tips, tricks, suggestions, etc., would be appreciated.
Thanks!!!
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Feb 25, 2008
Hello all, I have a very simple script which I use to truncate and reclaim space on all the transaction logs in a SQL Server 2005 database. However, I have some Sharepoint db names I can't change that have dashes ('-') in the names, e.g., SharePoint_AdminContent_dc27334f-fb2d-4453-9764-5d8b730fb9e1. The script won't back up those databases because it has a problem with the dashes in the names. Does anyone have any thoughts on how I could modify the script to get it to work? Here is the script:
ALTER PROCEDURE [dbo].[SP_GlobalTruncate_transaction_logs]
AS
Set quoted_identifier off
DECLARE @dataname varchar(300)
DECLARE @dataname_header varchar(75)
DECLARE datanames_cursor CURSOR FOR SELECT name FROM sysdatabases
WHERE name not in ('master', 'pubs', 'tempdb', 'model', 'northwind')
OPEN datanames_cursor
FETCH NEXT FROM datanames_cursor INTO @dataname
WHILE (@@fetch_status <> -1)
BEGIN
IF (@@fetch_status = -2)
BEGIN
FETCH NEXT FROM datanames_cursor INTO @dataname
CONTINUE
END
SELECT @dataname_header = 'Database ' + RTRIM(UPPER(@dataname))
PRINT ' '
PRINT @dataname_header
EXEC('BACKUP LOG ' + @dataname + ' WITH TRUNCATE_ONLY')
EXEC('DBCC SHRINKDATABASE (' + @dataname + ',TRUNCATEONLY)')
FETCH NEXT FROM datanames_cursor INTO @dataname
END
DEALLOCATE datanames_cursor
PRINT ''
PRINT ' '
PRINT 'Free space removed and transaction log truncated for each user database'
GO
And here is the error I get:
Database SHAREPOINT_ADMINCONTENT_DC27334F-FB2D-4453-9764-5D8B730FB9E1
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near '-'.
Msg 319, Level 15, State 1, Line 1
Incorrect syntax near the keyword 'with'. If this statement is a common table expression or an xmlnamespaces clause, the previous statement must be terminated with a semicolon.
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near '-'.
Thanks so much for the help.
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Aug 2, 2000
hi,
I have a stored procedure to calculate the balance for a group of people. Inside the sp,
I created a temp table at the beginning of the procedure, then use it to calculate the opening
balance first, then I truncated the table in the middle, reuse it to calculate the closing balance.
The sp will take the from date and the through date to do the calculation. Somehow,
when I passed a different from date and the same through date to the sp, it returned a different
closing balance. It took me a while to figure out that the temp table I was using didn't get
truncated in the middle. I did a 'select count(*) ' directly after the truncate statement.
Sometimes it returned a non-zero number, and sometimes it returned 0.
We are using SQL 7.0 Service pack 1. Does anyone know the reason?
Heidi Zhang
hZhangcti@use.net
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Jul 31, 2006
Hi All,
I have a question that keeps my mind buys and I wasn't able to find answer on that.
I have a full backup recovery plan and I am backing up my Log files in every 15 minutes. At the same time My log files are shrunk in every 3 hours so Are shrinking the log files correct approach?
If somebody enlighten me on this issue I appreciate it.
Thanks
LS
:confused:
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May 24, 2004
after backup the log with truncate_only,
dbcc shrinkdatabase('ABC', 10)
failed with following error:
Cannot shrink log file 2 (ABC_Log) because all logical log files are in use.
I have put above statements with a job running every night, just got the same error on shrinkdatabase.
Is there a way to shrink the log without stop-restart the sql server?
-D
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Nov 6, 2015
I re-started the SQL Service.
I did numerous commands with no luck.
Shrink DB, Shrink files and shrink DB.
I tried the GUI but it bombs out.
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Jul 20, 2005
Hello,I am hoping you can help me with the following problem; I need to process the following steps every couple of hours in order to keep our Sql 2000 database a small as possible (the transaction log is 5x bigger than the db).1.back-up the entire database2.truncate the log3.shrink the log4.back-up once again.As you may have determined, I am relatively new to managing a sql server database and while I have found multiple articles online about the topics I need to accomplish, I cannot find any actual examples that explain where I input the coded used to accomplish the above-mentioned steps. I do understand the theory behind the steps I just do not know how to accomplish them!If you know of a well-documented tutorial, please point me in the right direction.Regards.
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Nov 6, 2003
A small database ABC with data only 5 mb but its log is growing everyday around 20 mb. I want to shrink its size like for other databases on daily bases.
1. backup log ABC with truncate_only
2. DBCC SHRINKDATABASE (ABC, 10)
got following error:
<<Cannot shrink log file 2 (ABC_Log) because all logical log files are in use.>>
with no_log also tried but have the same error when dbcc shrinkdatabase..
any idea?
thanks
-D
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Oct 12, 2015
how to shrink log files in SQL 2014 alwaysOn ?
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Mar 30, 2007
I am looking for a way to truncate raw files without losing the metadata. The metadata of the raw file should be automatically detected at run-time. The result will be a raw file with the same metadata as the original file, but no data in it.
There are two reasons I would like such a tool. First, I want to erase the potentially sensitive data stored in the raw files. Second, I want to keep Validation enabled so that development is simpler.
Is anyone aware of such a tool?
Thanks,
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Jan 10, 2012
I am trying to reorganise the log files on a server, (long story short they are fragmented so I want to shrink and reset the initial size and growth) and I am unable to shrink them. When I run the following:
use test
DBCC SHRINKFILE(test_log, TRUNCATEONLY)
--or
use
DBCC SHRINKFILE(test_log,2, TRUNCATEONLY)
I get the following message:
Msg 8985, Level 16, State 1, Line 1
Could not locate file 'test_log' for database 'test' in sys.database_files. The file either does not exist, or was dropped.
I get this message for every database on the server. I got the logical name of the file using sp_helpfile and have checked it against sys.masterfiles, sys.database_files and sys.sysaltfiles, all match up and confirm the name 'test_log'.
I rebooted the server last night and was able to shrink the first couple of .ldf's I tried so I presumed it was fixed. This morning when I try again i get the sanme error, I don't see anything in the SQL server or system logs that indicates a change.
I am able to add new log files and remove log files, however if I add a new log file (test_log2) and then try and truncate that file I get the same error.
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Apr 13, 2004
Hello everybody,
I have run into some problems with logfiles and backup logfiles (MS SQL server). I have read much about them but uptil now I dont seem to grasp how it works. Specially the part of working with backup log files.
Can someone please help me with this?
What I want todo is to create backup log files, so I can restore the database to any point in time before a failure occured. But using this method create's a problem with the backup log files. They get very big.
So how can I use backup log files without getting to large backup log files?
How can I shrink on a regular basis the backup log files and still be able to restore the database?
Please help.
Best regards,
Marc Janssen,
:)
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Oct 18, 2006
I have created an Integration Services package on my development machine. The package contains a configuration file witch let's say is stored in c:projectsMyIntegrationServicesProjectmyConfigfile.dtsConfig (on my dev machine).
Then I have another "Production" machine where I import the SSIS package into an SQL database. I then create an sql-job with only one step, to run my SSIS package. This works fine if I configure the step to be an "SQL Integration services package" and configure it to use my configurationfile.
However I would like to configure this package as a CmdExec step. In the commandline, I specify /CONFIGFILE "d:....myConfigfile.dtsConfig" (the correct path on the prod machine). But it seems to be ignored, because when I execute the package I get an error telling me that the configuretion file c:projectsMyIntegrationServicesProjectmyConfigfile.dtsConfig cannot be found.
What I try to say is, it seems like it ignors the config-file I specify on the command-line and tries to reach the config-file on a location that's probably stored somewhere in the SSIS package from the time it was created on my development machine.
Is there a way around this?
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Oct 26, 2007
I have SQL 2005 on 64 bit cluster OS is Windows server 2003 SP2.
We have full-text enabled on one table of the database. It has doc,xls,pdf and swf type of documents. Now full text works for word and excel docs but not for pdf files.
I searched online and found two commands to execute after installing Adobe 6.0 ifilter. I did it last week and then server was rebooted last weekend so it restarted all the services
exec sp_fulltext_service 'load_os_resources', 1
exec sp_fulltext_service 'verify_signature', 0
still pdf full text search is not working. Does this ifilter from Adobe works for 64 bit?
many errors as below are loged into the log file
Informational: Full-text Full population initialized for table or indexed view '[dbname].[dbo].[tablename]' (table or indexed view ID '862626116', database ID '10'). Population sub-tasks: 4.
2007-10-21 06:00:50.59 spid30s Warning: No appropriate filter was found during full-text index population for table or indexed view '[dbaname].[dbo].[tablename]' (table or indexed view ID '10', database ID '862626116'), full-text key value 0x000015E1. Some columns of the row were not indexed.
2007-10-22 06:01:34.07 spid28s The component 'offfilt.dll' reported error while indexing. Component path 'C:WINDOWSsystem32offfilt.dll'.
2007-10-22 06:01:34.07 spid28s Error '0x80030109' occurred during full-text index population for table or indexed view '[dbname].[dbo].[tablename]' (table or indexed view ID '862626116', database ID '10'), full-text key value 0x000013A1. Attempt will be made to reindex it.
Mintu
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Nov 21, 2007
I am able to perform full text searches if I inform SQL Server the file is a text file but when I set the correct type as a csv the file does not get indexed.
Also nocticed that I have two IFilters one that comes with SQL and the other with Office they have the same name and just the one that is on system32 handles CSV files, office files are processed correctly.
This are the IFilter locations:
C:WINDOWSsystem32offfilt.dll
C:Program FilesMicrosoft SQL ServerMSSQL.4MSSQLBinnofffilt.dll
I have a valid CSV but when I run the FiltDump.exe command I get:
C:Temp>FiltDump 1075555.csv
FILE: 1075555.csv
Error 0x80030050 loading IFilter
This is the type of error log I get from SQL Server:
2007-11-20 15:30:18.46 spid24s Warning: No appropriate filter was found during full-text index population for table or indexed view '[FileStorage].[dbo].[Document]' (table or indexed view ID '6', database ID '162099618'), full-text key value 0x00000002. Some columns of the row were not indexed.
I will appreciate any help provided.
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Mar 24, 2008
I used the toolbox to select maintenance cleanup task to create the job to do this. In reading similar notes regarding this problem, some people mentioned that there was a choice to include subfolders. I do not have this choice. When I execute select @@version I get Microsoft SQL Server 2005 - 9.00.3042.00 (X64) Feb 10 2007 00:59:02 Copyright (c) 1988-2005 Microsoft Corporation Enterprise Edition (64-bit) on Windows NT 5.2 (Build 3790: Service Pack 2) . This is running on a cluster. Any idea what is going on here? Thanks.
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May 13, 2008
I want to export file such as .csv, xml , word from ReportViewer in visual studio 2008 but when I run on ASP.NET .net framework 2.0, it can export only excel & pdf files. But in business intelligent project in Visual Studio 2005 I can export all files that I want.
How can I export file from reportviewer in visual studio 2008 run on web application?
Regards,
NPeng
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Dec 30, 2004
With a database size of almost 2 GB, I run the 'truncate table eventlog command' which completes successfully, but the database size only decreases by about 10 MB so stays too large - indeed the number of rows in the eventlog table is minimal, but the otehr tables in this database don't show such an amount of tables large enough to cause the size issue either. What could be the reason and how can I reduce it (possibly truncating another table but then which one, how could I determine which is too large and needs truncating?).
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Jan 5, 2007
If you have problems shrinking a transaction log no matter what commands you issue, here's a way to shrink the tranlog:
1. Right click on the properties of the database and go to the options tab.
2. Change the recovery mode to simple.
3. Right click again on the database - go to all tasks - shrink database.
4. Shrink the database.
5. Change the recovery mode back to what you had it as.
I found this out by trial and error as I could not find any documentation on it and no matter what I tried, I could not get the transaction log to shrink.
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Apr 17, 2008
Hi all...
Please forgive the elementary nature of my question, but could someone please explain the differences between these two database backup types:
1. Log backup
2. Log backup no truncate
From what I understand and have read, the "no truncate" backup method keeps the entire transaction log indefinitely. Using the truncation method, the transaction log is either 1) compressed or 2) cleaned up so that any completed transactions are removed from the log. Which one of these is true?
And, for the big question: is it better to run a backup of the transaction log with truncation or not? Our current backup scheme is similar to the following:
Full backup every 24 hours
transaction log backup every hour with no truncation
Should we insert a truncation backup somewhere in here? What is the danger of removing (or compressing) parts of the transaction log? Will this affect the restore process?
Thanks in advance!
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Jun 6, 2002
I have a SQL 7.0 sp3 server and I am trying to shrink a production database for use on other servers. The database/log sizes are 9601mb / 138mb with 772mb / 128mb free. I truncate a table that contains binary data. After this the database/log sizes are 9601mb / 138mb with 6634mb / 111mb free. The next step is to use EM to issue a shrink db. After this the database/log sizes are 6807mb / 378mb with 9.56mb / 365mb free.
After the use of truncate the the data in the datafile is about 2967mb.
After the shrink db the data in the datafile is about 6797mb.
The size of the data grew after the shrink db was issued. I looked at the tables and the space is largely associated with two tables that have a binary field, but the number or rows are still the same. I ran a checkdb just to make sure that there was not a problem and no problems were reported. I have used this process many times and this is the first time I have come up with these results. Any suggestions?
Thanks,
Glen
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Aug 17, 2001
if I shrink the db will it enable me to create another db with that space released by the first db?
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Jul 19, 2000
How can i shrink my log file? It is like 900 megs and i
was it to be more like 400 megs.
Please Help
Melissa Sener
Project Manager
Square Yard
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Sep 27, 2002
Hi, My name is Alexander and came´s to ask about Sql Server log.
Do you know why sometimes the log not truncate? All time
comes increasing!
I setup "Automatic Shrink" and it swims happens. If you can help me!
Thanks in advanced
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Jun 30, 1999
Hi everybody:
Actually I have a 8.5 Gb database but the correct size that I need
to due disk space is 5 Gb. When I make a backup, the size of the dump is
4Gb, so I wonder if I create a 4- 4.5Gb my dump db will fit in it, but
not. Other way is create antoher db with 4 - 4.5 Gb and transfer via
sql-transfer or sql-bcp but I got a message that my device is too
short.
So I ask : What are the correct ways to reduce the size of a
database ?
Thanks in advance.
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Jun 16, 2004
Hello,
We just migrated our DB from one SQL Server to Another. Both DB's used to be the same size at 11GB. The new SQL Server is a whopping 33GB, and I can't seem to find out why. The new DM has fewer tables (the data is identical).
Does anyone know how I can compact or shrink my DB, know why or how it grew so much and didn't go back down to normal size, and maybe where I can search properties or change settings to find out what is going on and prevent it from happening again.
I know MS Access has a shrink utility, but don't know where it is in SQL Server.
Thanks, in advance for your help.
Rodney
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Jul 26, 2004
Hello,
I have a 24go sqlserver 2000 database, but only 5go used, when i use the shrink command in em there is no change.
can i modify the property of the db (auto-shrink => on ) actually it's on OFF.
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