Transaction Log Files/Virtual Log Files
Oct 1, 2004
I am wanting to reduce the amount of Virtual Log Files I have. In reading through the Online Book Documentation, I realize that I have forgotten to move the Transaction Log Files to a different drive. Now that the server is in production, I wanted to get some input about the best way of making this change.
Can I just change the directory the log files are being written to in the DB properties without having any adverse problems occurring?
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Nov 8, 2012
We are using sql server 2008 r2 standard with sp2. I have a 12 GB database in production server, log file was set to 150MB with increment of 10 percent, in last 4 years database size has gone from 2gb to 12 gb. I ran following command
DBCC LOGINFO
And found I have 150 plus rows(which means 150 plus virtual log files)
I increased the size of log file to 25 percent of data file which comes to be approx 3gb and also set auto growth to 20 percent ...
Additional info: we have a log shipping environment in production, i am taking log backups every 15 mins.. still number of virtual log files is same , why is that , how to bring them between number of 25-50 as thats the recommended.
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May 20, 2015
Is there a better way to deal with the virtual log files?...I see several approaches in dealing/decreasing the virtual log files for a database..want to know what's the best n safest approach, from the masters here?
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Jun 8, 2015
I am getting this massage in error log .
"Database XYZ has more than 1000 virtual log files which is excessive. Too many virtual log files can cause long startup and backup times. Consider shrinking the log and using a different growth increment to reduce the number of virtual log files."
I am using  sql server 2008r2.
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Oct 14, 2015
Any good starting point to understand for a specific db, how many max VLFs are good to have so that it does not cause long startup or backup times?
Also, I need some calculation so that I can identify a best growth parameter I will setup for each database ?
I'm seeing the below msg in errorlog and curious to know the changes (right sizing/growth) to be done? As of now 100 MB of log file growth value is set (refer: [URL] ....)
Database BizTalkMsgBoxDb has more than 1000 virtual log files which is excessive. Too many virtual log files can cause long startup and backup times. Consider shrinking the log and using a different growth increment to reduce the number of virtual log files.
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Aug 28, 2000
How can I check if database transaction log file is full.
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Dec 5, 2001
Hello,
I have a database with two data files as x.mdf, y.ndf and two transaction log files as l1.ldf, l2.ldf. I wanted to have only one log file for this database. What are possible options for me to make these two transaction log files into one transaction log file leaving data files as it is?
Thanks in Advance!
Kumar.
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Oct 24, 2006
Hi All,
I am trying to understand the difference between the physical, logical and virtual logs. I found some info in BOL, but I am still a little bit confused.
What is the physical file? Is each transaction considered a physical file?
Each physical log file consists of a number of virtual log files.
Then what about the logical log? When does it come into play?
Thanks.
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Jan 10, 2005
Hi,
I'm wondering if when adding another transaction log file, if the DB needs to be detached in order to remove that file. Or rather, what do you have to do in order to reduce the number of transaction log files..?
Cheers,
-Kilka
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Sep 13, 2001
Hi,
I think we dont have option to read Transaction file in SQLserver Other than using Logexplorer. IS this Logexplorer working file to audit the sql server. We are planning to buy Logexplorer. Is it good product to buy.
Plese give some suggestions.
Thanks
keerthi
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Aug 7, 2007
Hi,
In one of our DR Servers we have configured Custom Logshipping. In the folder where the .TRN files are getting copied there is a script to purge the files which are older than one day. Following is the code for the same.
@Echo Off
if exist filelist del filelist
date /t > rundate
for /f "tokens=2* delims= " %%i in (rundate) do set rundate=%%i
for %%i IN (*.trn) do echo >> filelist %%i %%~ti
for /f "tokens=1,2* delims= " %%i in (filelist) do if not %rundate% equ %%j del %%i
:pause
:Exit
Instead of removing the files older than 1 day, I need to keep 3 days transaction logs.
Being a novice I don't have much idea how to accomlish it. Can anybody help me with this?
Many thanks in advance,
Sandhya
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Apr 4, 2007
i have a few tables using Sql Server 2005 Express. currently they are holding roughly 30-40k records in them. i have my log files set at restricted growth to 90 megs. while im not close to reaching that, i would like my tables to be able to scale up to possibly millions of records. based on that, i figure the transaction log file will prolly need to have a higher threshold (unrestricted growth). for those with experience, for tables that have millions of records, what are the average size log files i could expect.
is it a bad idea to just shrink the log file every night during off peak hours so that regardless of the amount of records i have, ill always start the day with a minimal log file?
do large log files have any effect on SQL performance?
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Sep 14, 2006
I already did the following but still it wont delete the log file because it is not empty- DBCC SHRINKFILE('logfilename',EMPTYFILE) - DBCC SHRINKFILE('logfilename',TRUNCATEONLY)- ALTER DATABASE databasename REMOVE FILE logfilename
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Apr 17, 2007
Hello guys and girls. I have installed SQL Server 2005 Standard Edition and I have specified that the databases should be created on the K: drive. This is okay but now I need to move all the transaction log files (.ldf) to the L: drive. I have already changed the default location for the log files to point to the L: drive and the new databases that were created after the installation have their transaction log file correctly in the L: drive but now I need to move transaction log files for the master, model, temp ... databases. How can this be done? And are there any gotchas?
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Apr 19, 2004
Hello -
I have a database server with over 300 databases. I want that MS-SQL Server should daily report me the sizes of SQL databases along with Transaction log files by sending me an email on my address.
How can I do that. Does someone have any script which can help me to do that.
Any help will be appreciated.
Kind Regards,
Rubal Jain
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Jul 20, 2005
We have two db's. One live and one test.When I right click on the live one in SQL Enterprise Manager andselect properties -> Data Files ->File Name is LIVE.MDFLocation is F:DataLIVE.MDFWhen I right click on the test one in SQL Enterprise Manager andselect properties -> Data Files ->File Name is LIVE.MDFLocation is F:DataTEST.MDFSame thing applies to Transaction log files too.My concern is File Name is same in both the above cases even thoughthe location is different. What are the consequences of this.Thanks for your helpGVV
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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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Mar 13, 2008
In the For Loop, How to Iterate from Older flat files to Newer flat files based on File's Timestamp. If there are some older files in that folder, it should be processed first and then continue with the newer one.
Any Suggestions?
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Apr 24, 2008
In the first step of my SSIS package I need to get files from FTP and dump it/them in a local directory, but it's more than that, the logic is like this:
1. If no file(s) found, stop executing and send email saying no file(s) found;
2. If file(s) found, then compare it/them with existing files in our archive folder; if file(s) already exist in archive folder, stop executing and send email saying file(s) already existed, if file(s) not in archive folder yet, then transfer it/them to the local directory for processing.
I know i have to use a script task to do this and i did some research and found examples for each of the above 2 steps and not both combined, so that's why I need some help here to get the logic incorporated right.
Thanks for the help in advance and i apologize for the long lines of code!
example for step 1:
----------------------------------------------------------------------------------------------------------
' Microsoft SQL Server Integration Services Script Task
' Write scripts using Microsoft Visual Basic
' The ScriptMain class is the entry point of the Script Task.
Imports System
Imports System.Data
Imports System.Math
Imports Microsoft.SqlServer.Dts.Runtime
Imports Microsoft.SqlServer.Dts.Pipeline.Wrapper
Imports Microsoft.SqlServer.Dts.Runtime.Wrapper
Imports Microsoft.VisualBasic.FileIO.FileSystem
Imports System.IO.FileSystemInfo
Public Class ScriptMain
' The execution engine calls this method when the task executes.
' To access the object model, use the Dts object. Connections, variables, events,
' and logging features are available as static members of the Dts class.
' Before returning from this method, set the value of Dts.TaskResult to indicate success or failure.
'
' To open Code and Text Editor Help, press F1.
' To open Object Browser, press Ctrl+Alt+J.
Public Sub Main()
Dim cDataFileName As String
Dim cFileType As String
Dim cFileFlgVar As String
WriteVariable("SCFileFlg", False)
WriteVariable("OOFileFlg", False)
WriteVariable("INFileFlg", False)
WriteVariable("IAFileFlg", False)
WriteVariable("RCFileFlg", False)
cDataFileName = ReadVariable("DataFileName").ToString
cFileType = Left(Right(cDataFileName, 4), 2)
cFileFlgVar = cFileType.ToUpper + "FileFlg"
WriteVariable(cFileFlgVar, True)
Dts.TaskResult = Dts.Results.Success
End Sub
Private Sub WriteVariable(ByVal varName As String, ByVal varValue As Object)
Try
Dim vars As Variables
Dts.VariableDispenser.LockForWrite(varName)
Dts.VariableDispenser.GetVariables(vars)
Try
vars(varName).Value = varValue
Catch ex As Exception
Throw ex
Finally
vars.Unlock()
End Try
Catch ex As Exception
Throw ex
End Try
End Sub
Private Function ReadVariable(ByVal varName As String) As Object
Dim result As Object
Try
Dim vars As Variables
Dts.VariableDispenser.LockForRead(varName)
Dts.VariableDispenser.GetVariables(vars)
Try
result = vars(varName).Value
Catch ex As Exception
Throw ex
Finally
vars.Unlock()
End Try
Catch ex As Exception
Throw ex
End Try
Return result
End Function
End Class
example for step 2:
-------------------------------------------------------------------------------------------------------
' Microsoft SQL Server Integration Services Script Task
' Write scripts using Microsoft Visual Basic
' The ScriptMain class is the entry point of the Script Task.
Imports System
Imports System.Data
Imports System.Math
Imports Microsoft.SqlServer.Dts.Runtime
Public Class ScriptMain
' The execution engine calls this method when the task executes.
' To access the object model, use the Dts object. Connections, variables, events,
' and logging features are available as static members of the Dts class.
' Before returning from this method, set the value of Dts.TaskResult to indicate success or failure.
'
' To open Code and Text Editor Help, press F1.
' To open Object Browser, press Ctrl+Alt+J.
Public Sub Main()
Try
'Create the connection to the ftp server
Dim cm As ConnectionManager = Dts.Connections.Add("FTP")
'Set the properties like username & password
cm.Properties("ServerName").SetValue(cm, "ftp.name.com")
cm.Properties("ServerUserName").SetValue(cm, "username")
cm.Properties("ServerPassword").SetValue(cm, "password")
cm.Properties("ServerPort").SetValue(cm, "21")
cm.Properties("Timeout").SetValue(cm, "0") 'The 0 setting will make it not timeout
cm.Properties("ChunkSize").SetValue(cm, "1000") '1000 kb
cm.Properties("Retries").SetValue(cm, "1")
'create the FTP object that sends the files and pass it the connection created above.
Dim ftp As FtpClientConnection = New FtpClientConnection(cm.AcquireConnection(Nothing))
'Connects to the ftp server
ftp.Connect()
'ftp.SetWorkingDirectory("..")
ftp.SetWorkingDirectory("directoryname")
Dim folderNames() As String
Dim fileNames() As String
ftp.GetListing(folderNames, fileNames)
Dim maxname As String = ""
For Each filename As String In fileNames
' whatever operation you need to do to find the correct file...
Next
Dim files(0) As String
files(0) = maxname
ftp.ReceiveFiles(files, "C: emp", True, True)
' Close the ftp connection
ftp.Close()
'Set the filename you retreive for use in data flow
Dts.Variables.Item("FILENAME").Value = maxname
Catch ex As Exception
Dts.TaskResult = Dts.Results.Failure
End Try
Dts.TaskResult = Dts.Results.Success
End Sub
End Class
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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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Jun 23, 2007
I'm experiencing a weird problem with log shipping in SQL 2005.
I've setup Log Shipping for a production database between two sites. The standby database is being updated correctly and everything seems to be working as expected but for one detail: the name of the transaction log backups are generated with an UTC timestamp instead of my local timezone.
The the data below extracted from the backup history:
2007-06-23 17:30:00.000 D:BackupDatabasesmydbmydb_20070623073000.trn
2007-06-23 17:15:00.000 D:BackupDatabasesmydbmydb_20070623071500.trn
2007-06-23 17:00:00.000 D:BackupDatabasesmydbmydb_20070623070000.trn
2007-06-23 16:45:00.000 D:BackupDatabasesmydbmydb_20070623064500.trn
My timezone here is GMT+10.
Although it's not affecting Log Shipping, it's very confusing as the full backups have a timestamp in the local timezone!
Has anyone seen experienced something similar to this? Please see below my SQL details:
1 ProductName NULL Microsoft SQL Server
2 ProductVersion 589824 9.00.3042.00
3 Language 1033 English (United States)
4 Platform NULL NT AMD64
5 Comments NULL NT AMD64
6 CompanyName NULL Microsoft Corporation
7 FileDescription NULL SQL Server Windows NT - 64 Bit
8 FileVersion NULL 2005.090.3042.00
9 InternalName NULL SQLSERVR
10 LegalCopyright NULL © Microsoft Corp. All rights reserved.
11 LegalTrademarks NULL Microsoft® is a registered trademark of Microsoft Corporation. Windows(TM) is a trademark of Microsoft Corporation
12 OriginalFilename NULL SQLSERVR.EXE
13 PrivateBuild NULL NULL
14 SpecialBuild 199360512 NULL
15 WindowsVersion 248381957 5.2 (3790)
16 ProcessorCount 4 4
17 ProcessorActiveMask 4 f
18 ProcessorType 8664 NULL
19 PhysicalMemory 4095 4095 (4294037504)
20 Product ID NULL NULL
Thanks,
André
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Oct 26, 2015
The MDF and LDF files are placed in SSD drive and tempdb files are placed in HDD drive. Snapshot isolation is enabled on the database. When a script is executed to insert data with NULL value to a table which has NOT NULL column, the transaction fails and then a log undo happens which fails and takes the database to suspect mode.
But when the MDF and LDF files are placed in HDD drive all this do not happen. The transaction just fails.
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Oct 8, 2007
Brief overview...Running SQL Server 2003 Server Enterprise 64 bit - All Service Packs and patches current
SQL Server 2005 Enterprise Edition 64 bit Build Microsoft SQL Server 2005 - 9.00.3054.00 (X64) Mar 23 2007 18:41:50 Copyright (c) 1988-2005 Microsoft Corporation Enterprise Edition (64-bit) on Windows NT 5.2 (Build 3790: Service Pack 2)
I cannot import any SSIS packages nor crete any new folders under stored packages. I hve googled the news groups and looked at BOL to no avail. HELP!!!!
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Sep 27, 2006
First of all i do not know whether this is the right form to ask the question Let me describe the scenario iam using Iam generating xml files at a particular place and sending them to a server xml1|--------------------->dataset1------------------------------>adapter1.update(dataset1)xml2|----------------------->dataset2----------------------------->adapter2.update(dataset2)xml3|----------------------->dataset3------------------------------>adapter3.update(dataset3) all the three updates should happen in only one transaction if any one of the update fails then the transaction should rollbackcan anyone tell me a way to do iti am desperately in search of any ways to do it can anybody help please
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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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May 15, 2015
We have multiple databases on a single instance in an OLTP environment. I have my data files on a separate SAN LUN from my transaction log files (and a few NDFs split out onto additional LUNs). I was wondering if there is a performance benefit to putting each LDF file on its own LUN? Or at least my few busiest LDFs?
We are currently on 2012, but I'm having to put together specs for a 2014 installation and need to answer this question without having an environment in which I can benchmark different setups. I just want to hear whether or not others have done this (why or why not?).
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Dec 8, 2007
Hi there - can anyone advise on the following issue. We have recently performed some server side tracing on a particular SQL instance over 24hr period. We are now attempting to load these into a database for analysis. Here lies the problem.
When we are loading the profiler trace files (one at a time) into the database the transaction log is growing at an excessive rate. Even though the database is in SIMPLE mode.
We are loading the traces using the command:
INSERT INTO sqlTableToLoad
SELECT * FROM ::fn_trace_gettable('MytraceFileName', DEFAULT)
Can anyone advise how we could possibly get round this issue as we're running out of space due to the transaction log.
Thanks
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Jul 23, 2005
I am thinking about replacing the INSERT data scriptfiles that I have with XML files. This way I can open the XMLfile using an XML Editor and see the values in a GRID andmake changes easier.Do you see any problem with this approach?I managed to put together some code that is exportinga SQL table with its data to an XML file and also a codethat reads the XML file's data and inserts it into a table.Now I am researching on XSD, td:datatype, DTD...(I am new to XML) in order to figure out how I canuse a single xml file that will hold both the sql serverfields, the datatypes and their values.If you have links to some sample code that has anythingto do with the datatype export and import I am workingon, can you please share them with me?Most importantly what do you think about the idea of usingXML files vs sql scripts?Thank you
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Jun 25, 2015
I have a scenario where I need to convert RDF files to PDF files? may I know is this achievable in SSIS - writing C# code?
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Sep 17, 2004
Hi!
I'm using replication with two database on SQL 2000,when begin, the log files size is 50mb and the data files size is 150mb. But now the log files size is 2Gb and the data files size is 4Gb. I would like to decrease the log files and the data files ??? How do i do this???
(I using Truncate and shrink doesn't change )
Thanks!!!
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Dec 11, 2005
I need to write codes to access many image files and wave files and display them on the webpage. Both of these files are stored on the server (as many experts in this forum adviced) and their locations are in the SQL server database. About the wav files, I think I will have to convert them to MP3 first for fast delivery on internet. Since I am a newbie, any help would be appreciated.
Thanks,
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Jul 20, 2005
I have a problem with bcp and format files.We changed our databases from varchar to nvarchar to support unicode. Noproblems so fare with that. It is working fine.But now I need a format file for the customer table and and it is notworking. It is working fine with the old DB with varchar, but withnvarchar I'm not able to copy the data. The biggest problem is, that Igot no error message. BCP starts copying to table and finished withouterror message.This is my table:CREATE TABLE [dbo].[Customer] ([ID] [int] NOT NULL ,[CreationTime] [datetime] NULL ,[ModificationTime] [datetime] NULL ,[DiscoveryTime] [datetime] NULL ,[Name_] [nvarchar] (255) COLLATE SQL_Latin1_General_CP1_CI_AI NULL ,[Class] [int] NULL ,[Subclass] [int] NULL ,[Capabilities] [int] NULL ,[SnapshotID] [int] NOT NULL ,[CompanyName] [nvarchar] (255) COLLATE SQL_Latin1_General_CP1_CI_AI NOTNULL ,[TargetRCCountry] [nvarchar] (255) COLLATE SQL_Latin1_General_CP1_CI_AINOT NULL ,[LocationID] [int] NULL ,[MirrorID] [binary] (16) NULL ,[DeleteFlag] [bit] NULL ,[AdminStatus] [bit] NULL) ON [PRIMARY]GOand this is the format file:8.0131 SQLINT 1 12 "#~@~#" 1 ID ""2 SQLDATETIME 1 24 "#~@~#" 2 CreationTime ""3 SQLDATETIME 1 24 "#~@~#" 3 ModificationTime ""4 SQLDATETIME 1 24 "#~@~#" 4 DiscoveryTime ""5 SQLNCHAR 2 510 "#~@~#" 5 Name_SQL_Latin1_General_CP1_CI_AS6 SQLINT 1 12 "#~@~#" 6 Class ""7 SQLINT 1 12 "#~@~#" 7 Subclass ""8 SQLINT 1 12 "#~@~#" 8 Capabilities ""9 SQLINT 1 12 "#~@~#" 9 SnapshotID ""10 SQLNCHAR 2 510 "#~@~#" 10 CompanyNameSQL_Latin1_General_CP1_CI_AS11 SQLNCHAR 2 510 "#~@~#" 11 TargetRCCountrySQL_Latin1_General_CP1_CI_AS12 SQLINT 1 12 "#~@~#" 12 LocationID ""13 SQLBINARY 1 33 "#~@~#
"13 MirrorID """#~@~#" is the field terminator. We have a lot of text files with allkind of charachers in it. So we think this is a set that will neveroccur in our files.Thanks for your help!*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
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Jun 14, 2007
Hi All,
Are there any MDS Descriptor Files associated with Databases Files? Are these associated with transaction logs? As per my information there are .mdf , .ndf and .ldf files.Could anyone please guide me ASAP,as there is an urgent requirement from one of the clients?
Thanks in Advance
Gaurav Matkar
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