Skip to main content

Growing Log file issues - How to shrink a SQL server Log and data file.


Sometimes it is necessary to do this via a script as the UI does not work for reasons such as the DB is being in used. This method sets the recover mode and then shrinks the log and data file.

Before doing this backup your databases using Management studio
Open up a query window associated with the database with the large transaction log. (Right-click on the DB and choose new query.)

Get the logical name of the transaction log file. (Right-click on the DB, select Properties, then in the Files screen, grab the Logical Name… probably ends in something like _Log.)

Execute the following, substituting with the appropriate logical name of the database log file, no quotes needed:

 Use [Mydatabase]

 ALTER DATABASE [mydatabase] SET RECOVERY SIMPLE

 DBCC SHRINKFILE(<log_file_name_Log>)

ALTER DATABASE [mydatabase] SET RECOVERY FULL


 The following screen shows the log file before the shrink.
Log file after shrink
Points of interest
  • Transaction logs have to be backed up in order for them to ‘truncate’. If they are not backed up regularly, they will eventually fill the disk
  • a full backup alone will not do the trick – that does not touch the transaction log
  • transaction logs must be backed up via ‘BACKUP LOG’
  • if the dba does not require transaction log backups, it is advisable to move to Simple Recovery
A little more info here:
http://technet.microsoft.com/en-us/library/ms189085.aspx



Comments

Post a Comment

Popular posts from this blog

Removing HTML Tags from Text Using SQL Server User-Defined Function

  Introduction: In this blog post, we'll explore how to create and use a SQL Server User-Defined Function (UDF) to remove HTML tags from a text string. This function can be handy when you need to extract plain text from HTML content stored in your database. Creating the Function: First, let's create the SQL Server UDF named udf_StripHTML . This function takes a VARCHAR(MAX) parameter @HTMLText , which represents the HTML content from which we want to remove the tags. It returns a VARCHAR(MAX) value, representing the text stripped of HTML tags. sql SET QUOTED_IDENTIFIER ON GO  CREATE FUNCTION [dbo].[udf_StripHTML] ( @HTMLText VARCHAR (MAX)) RETURNS VARCHAR (MAX) AS BEGIN DECLARE @Start INT   DECLARE @End INT   DECLARE @Length INT   SET @Start = CHARINDEX( '<' , @HTMLText )  SET @End = CHARINDEX( '>' , @HTMLText , CHARINDEX( '<' , @HTMLText ))  SET @Length = ( @End - @Start ) + 1   WHILE @Start > 0 AND @...
Post a Comment
Read more

Using SSRS web services to render a report as a PDF

I have been looking around the net for some decent code which would explain how I could render a report, using SSRS 2008 web services as a PDF.   The need was to extract reports sitting on a SSRS 2008 server sitting on a NT domain on a trusted network, whereas my web server was sitting in a DMZ. Where the only communication allowed by the network admin was port 80. To do this you will need to use the SSRS2008   ReportExecution2005.asmx web service. This could be accesses using the following URL assuming your SSRS server was installed using the default settings. http://YourServerIP/reportserver/reportexecution2005.asmx?wsdl 1.        Create a user on your AD domain with the least amount of privileges (say ReportUser) 2.        Give this account browse access on the reporting server for the desired reports. 3.        To get this working in visual studio 2010 (I am using t...
1 comment
Read more

How to Automatically Create SQL Server Views from MySQL Tables Using OPENQUERY (An alternative to ETL)

If you have a linked server from SQL Server to MySQL, you can automate importing data and creating views using dynamic SQL. This is useful when integrating external MySQL data into a Microsoft SQL Server reporting or analytics environment. 🔗 Setup: Linked Server to MySQL Make sure you have already set up your MySQL linked server in SQL Server (for example, named SB ), and that you can run queries like the following: SELECT * FROM OPENQUERY(SB, 'SELECT * FROM your_table'); ⚙️ Goal We want to dynamically create SQL Server views for all base tables in a MySQL database, using a format like: CREATE VIEW [dbo].[lnk_table_name] AS SELECT * FROM OPENQUERY(SB, 'SELECT * FROM table_name WHERE deleted_at IS NULL'); But not all MySQL tables have a deleted_at column. So, we will check whether the column exists before appending the WHERE clause. 🧠 Full SQL Script This SQL Server script loops through all MySQL tables and generates the appropriate view creation stat...
Post a Comment
Read more