Truncate Ms Sql Database Log File

Truncate SQL Server transaction log file. (log file) of that database that is 16gb. I would like to truncate that file. How to Shrink Your MS SQL Database Log File / Truncate Transaction Log.

You can also delete the inactive transactions from a transaction log file by using the Truncate. the recovery model for a SQL Server database is set to. Introduction. SQL Server 2005 is quite different from SQL Server 2000. To truncate log file is one thing which is different from SQL Server 2000. Thanks for your code for SQL SERVER – Shrinking Truncate Log File. to truncate log file for a database in. (MS SQL Server 2000) as well where the. How do I truncate the transaction log in a. The safest and correct way to truncate a log file if the database is in. MS SQL Server 2008 Transaction log file. What is the command to truncate a SQL Server log file? better than setting the database recovery model. DBCC SHRINKFILE to truncate the log file. share. SHRINKFILE and TRUNCATE Log File in SQL Server 2008. -- Truncate the log by changing the database recovery model to SIMPLE. MS SQL Server 2005.

Difference between truncating and shrinking the transaction log file « Sql server Blog Forum. Difference between truncating and shrinking the transaction log file. I have noticed in many forum the frequently asked question is “Truncating and shrinking the log file both are same”The answer is obviously NO.

Truncating log file in SQL Server using T-SQL when log file is too large and database. How to Truncate Log File in. log file. Truncate is.

These both are totally different. Before going into discussion, let’s read the transaction log file architecture.

Truncating the transaction log: Truncating a log file will change one or more VLF file’s status from active to inactive and mark the space for reuse. SQL server will change the VLF from active to inactive and reuses it automatically (Just like a circular). When does it truncate and reuse it automatically? It depends upon your setting: recovery model and backup type.

SQL server runs a CHECKPOINT В an every time truncate/mark the inactive portion of the VLF files and reuse it automatically, When. В a database is in simple recovery model. SQL server runs the CHECKPOINT an every time truncate/mark the inactive portion of the VLF files and reuse it automatically, When you perform the log backup in under the FULL or BULK LOGGED Recovery model. You can truncate the log file (VLF) manually by using the TRUNCATE_ONLY or В NO_LOG commands. Here is the test: Now run the log backup.

BACKUP LOG test TODISK='e: \backup\test. Msg 4. 21. 4, Level 1. State 1, Line 1. BACKUP LOG cannot be performed because there is no current database backup. Msg 3. 01. 3, Level 1. State 1, Line 1. BACKUP LOG is terminating abnormally.

Check the error log by using below command. SP_READERRORLOG 0,1,'BACKUP LOG WITH TRUNCATE_ONLY'BACKUPLOGWITH TRUNCATE_ONLY or. WITH NO_LOG is deprecated. The simple recovery model should be used to automatically truncate the transactionlog.

Note: В  When you use this command you can’t do regular log backup and point in time recovery too. В This command will truncate the log files (VLF) and break the log chain. To maintain the log chain again you have to run full or differential backup. Microsoft has removed this command in SQL server 2. What to do in SQL server 2. You can use the вЂ3. Let’s check,BACKUP LOG test WITH TRUNCATE_ONLYHa…SQL server throwing the following error.

Msg 8. 30. 9, Level 1. State 1, Line 1. BACKUP LOG WITH TRUNCATE_ONLY or WITH NO_LOG is deprecated. The simple recovery model should be used to automatically truncate the transaction log. Shrinking the transaction log: Shrinking the log file will reduce the physical log file size.

Shrinking the log file is not best practice until you don’t have any other option. OK, How to avoid the shrinking? Frequently run the log backup and maintain the log size as small as possible. Alter the database and point the log file.  to another drive/Add new drive.

If your company ready to accept the data loss (minimum like 2 to 3 hours) then puts the database in simple recovery mode and run the differential backup every 2 to 3 hours. It will maintain the log file as much as but not for the continuous huge transaction database.

You can manually shrink the log file by using the below command. Important note: Shrinking the data/log file will increase the fragmentation. Try to truncate the log file instead of shrinking. This means running the log backup more frequently. SELECT name FROM SYS. MASTER_FILES WHERE DB_NAME(database_id)='test' Test_log is the logical name of “test DB”.

DBCC SHRINKFILE (Test_Log) Sometimes your shrink command will not shrink the database. When there is. В an active portion of log is available OR the transaction is not closed (not yet committed).

Here is the code to find you can able to shrink your database files or not. It will give you a clear picture about your database files used and free space. Databasename. SELECT DB_NAME() AS DBNAME. NAME AS FILENAME. SIZE/1. 28. 0 AS CURRENTSIZE_MB. SIZE/1. 28. 0 - ((SIZE/1. CAST(FILEPROPERTY(NAME, 'SPACEUSED') AS INT)/1.

AS USEDSPACE_MB. SIZE/1. CAST(FILEPROPERTY(NAME, 'SPACEUSED') AS INT)/1.

AS FREESPACEMB. PHYSICAL_NAME,DATABASEPROPERTYEX (DB_NAME(),'RECOVERY') AS RECOVERY_MODEL,TYPE_DESC. CASE WHEN IS_PERCENT_GROWTH = 0. THEN LTRIM(STR(GROWTH * 8. MB, '. ELSE 'BY ' + CAST(GROWTH AS VARCHAR) + ' PERCENT, 'END +. CASE WHEN MAX_SIZE = - 1 THEN 'UNRESTRICTED GROWTH'. ELSE 'RESTRICTED GROWTH TO ' +LTRIM(STR(MAX_SIZE * 8. MB'. END AS AUTO_GROW.

FROM SYS. MASTER_FILES. WHERE DATABASE_ID = DB_ID()See the Shrink result : Db. Id. File. Id. Current. Size. Minimum. Size.

Used. Pages. Estimated. Pages. 52. 30. 57. Alright the shrinking doesn’t reduce the file size. Let’s check 1) open transaction by. В using DBCC OPENTRAN. Check the virtual log file status using DBCC loginfo().

Step: 1. Transaction information fordatabase‘test’. Oldest active transaction: В В В  SPID (server process ID): 5. В В В  UID (user ID): -1. В В В  Name. В В В В В В В В В  : INSERTВ В В  LSNВ В В В В В В В В В  : (1. В В В  Start time.

В В В  : Mar. В  7 2. В  4: 1. 8: 4. 4: 2. PMВ В В  SIDВ В В В В В В В В В  : 0×0. DBCC execution completed. If. DBCC printed error messages, contact your system administrator. Sys. master_files’ will return the size of each file. SELECT size/1. 28,type_desc FROM SYS.

MASTER_FILES WHERE DB_NAME(database_id)='test'Step: 2‘DBCC LOGINFO()’ will return the status of the log file. If the status is 2 VLF in use (Active)If the status is 0 VLF not in use (Inactive)Look the BOL for more about DBCC loginfo().

Then, How to shrink the. В  log file? Ok…Wait until the open transaction finished. Check the log_reuse_wait_descsys. If you want you can automate the script to your Non Prod servers. It will help to minimize the database running out of space. SELECT name, recovery_model_desc, log_reuse_wait_desc FROM sys. WHERE name='test'.

Look the BOL for more about log_reuse_wait_desc. ALTER DATABASE [Test] SET RECOVERY SIMPLE WITH rollback immediate. DBCC SHRINKFILE(Test_Log). ALTER DATABASE [Test] SET RECOVERY FULL WITH rollback immediate. Note:   When you use this command you can’t do regular log backup and point in time recovery too. This command will truncate the log files (VLF) and break the log chain. To maintain the log chain again you have to run full or differential backup.

Conclusion. Shrinking the log file will reduce the physical log file size and truncating the log file will change one or more VLF files from active to inactive and marked the space for reuse. Thanks to Paul Randal and Kalen Delaney.

My special thanks go to Gila. Monster (Gail Shaw).