Select Page

Art of BI: SQL Server – Truncate and Shrink Log File

Christian Screen | | May 22, 2009

Often when building a database not all properties and settings are configured properly when initially created. One configuration property that we see left dangling the most is the default log file growth property of each database. The default allows a database log file to grow to a substantially large file size if not restricted. Often this file can leave your SQL Server box with low disk space errors and can crash SQL Server (prevent it from starting, etc.).

One quick and dirty way to alleviate a bloated log file’s size is to run a the command below in a new query window.

In the example below “GLReporting” is the name of the database in question and “GLReporting_log” is the alias name of the physical log file “GLReporting_Log.LDF”. Notice that the first parameter of the DBCC SHRINKFILE… command does not contain the “.LDF” file extension.

[sourcecode language=’sql’]
USE GLReporting
DBCC SHRINKFILE(GLReporting_log, 200)
DBCC SHRINKFILE(GLReporting_log, 200)

Further Important Information
As a side note to the above quick and dirty script, the best practice would be to prevent the database log file from growing out of control in the first place. To do this you must configure the log file growth restriction property. To accomplish this run the SQL Server Management Studio application, connect to your DB server, and open the Object Explorer.

Expand your database folder list. Right-click on the database in question and select “Properties”.

In the left hand menu of the new prompt select “Files”. In right-hand side of the the window prompt find the log file in question (sort by the File Type column if it helps you). Under the “Authgrowth” column click on the elipse for the log file row in question.

Under the “Maximum File Size” section ensure that “Restricted File Growth(MB)” is selected. The default setting for this property is 2,097,152 MB which is roughly 2 TeraBytes if my math is right.

So, let’s change that value to something more managable like 2,152 which gives us a max size of 2GB. If that is too low for you data then bump it up to something like 10,152 (10GB). Most basic databases shouldn’t need more that 10GB log space ever. Click “OK” at all of the prompts and you are finished.

12c Upgrade Bug with SQL Tuning Advisor

This blog post outlines steps to take on Oracle upgrade 11.2 to 12.1 if you’re having performance problems. Oracle offers a patch and work around to BUG 20540751.

Megan Elphingstone | March 22, 2017

Oracle EPM Cloud Vs. On-Premises: What’s the Difference?

EPM applications help measure the business performance. This post will help you choose the best EPM solutions for your organization’s needs and objectives.

Bobby Ellis | April 10, 2018
sharepoint ideas

9 Awesome Things You Can Do with SharePoint

This blog post discusses out-of-the-box uses for SharePoint that you can execute in just a few clicks without using any code.

Amol Gharat | May 23, 2017

Work with Us

Let’s have a conversation about what you need to succeed and how we can help get you there.


Work for Us

Where do you want to take your career? Explore exciting opportunities to join our team.