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How to Increase Number of SQL Server Error Log Files


Sept 15, 2014


Introduction

SQL Server Error Log is the best place for a Database Administrators to look for informational messages, warnings, critical events, database recover information, auditing information, user generated messages etc. By default, there are six archive error log files along with the current file named ERRORLOG. This article explains how to increase the number of SQL Server Error Logs from the default value of six.

Whenever SQL Server is restated, a new ERRORLOG file is created and the previous file is renamed as ERRORLOG.1, and the second most recent error log will be renamed as ERRORLOG.2 and the last error log will have a name similar to ERRORLOG.n. See the follow article to learn How to Recycle SQL Server Error Log file without restarting SQL Server Service.

If you are looking for option to limit the size of ErrorLog file then see the following article for more information How to Limit SQL Server Error Log File Size in SQL Server 2008 R2 and Later Versions.

Best Practice:: It is highly recommended to increase the number of SQL Server Error Log files from the default value of six to a minimum of 30.

How to Increase Number of SQL Server Error Log Files Using SSMS

Follow the below mentioned steps to increase the number of SQL Server Error Log files in SQL Server 2005 and later versions.

1. Open SQL Server Management Studio and then connect to SQL Server Instance

2. In Object Explorer, Expand Management Node and then right click SQL Server Logs and click Configure as shown in the snippet below.

Configure SQL Server Error Logs.png

3. In Configure SQL Server Error Logs window you can enter the value between 6 and 99 for the number of error logs and click OK to save the changes.

How to Increase Number of SQL Server Error Log Files

How to Increase Number of SQL Server Error Log Files Using TSQL Query

Execute the below mentioned TSQL query in SQL Server to increase the number of SQL Server Error Log file.

USE [master]
GO

EXEC xp_instance_regwrite N'HKEY_LOCAL_MACHINE'
    ,N'Software\Microsoft\MSSQLServer\MSSQLServer'
    ,N'NumErrorLogs'
    ,REG_DWORD
    ,99
GO

In the below screenshot you could see a new entry added in registry with the name NumErrorLogs and has a value as 99.

NumErrorLogs Registry Entry for Number of SQL Server Error Logs

Conclusion

This article explains how to increase the number of SQL Server Error Log files in SQL Server 2005 and later versions.


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