28 August 2013

Large transaction log files

by David Heath

19,468 0 Storage

This metric measures the number of transaction log files that are greater than 10 GB. The associated alert is raised when the number of files exceeds the specified threshold.

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This metric measures the number of transaction log files that are greater than 10 GB. The associated alert is raised when the number of files exceeds a specified threshold.

If the transaction log autogrows rapidly, it can suggest that log backups are not being carried out frequently enough, or another resource may be preventing the log from truncating.

For more information about autogrow settings, including details on how to check what your current setting is, see Considerations for the “autogrow” and “autoshrink” settings in SQL Server (MSDN).

Metric definition

Name

Large transaction log files

Description

This metric measures the number of transaction log files that are greater than 10 GB. The associated alert is raised when the number of files exceeds the specified threshold. If the transaction log autogrows rapidly, it can suggest that log backups are not being carried out frequently enough, or another resource may be preventing the log from truncating. For more information about autogrow settings, including details on how to check what your current setting is, see Considerations for the "autogrow" and "autoshrink" settings in SQL Server (MSDN).

The T-SQL query that will collect data


		
			
			
Transact-SQL
			
			DECLARE @Max_log INT;
SET @Max_log =  10240; -- size of the transaction log in MB
SELECT  COUNT(*) AS Cnt
FROM    master.sys.master_files
WHERE   type_desc = 'LOG'
        AND ( ( [size] * 8 ) / 1024 ) > @Max_log
        AND database_id = DB_ID();
			
				
					
				
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						DECLARE @Max_log INT;
SET @Max_log =  10240; -- size of the transaction log in MB
SELECT  COUNT(*) AS Cnt
FROM    master.sys.master_files
WHERE   type_desc = 'LOG'
        AND ( ( [size] * 8 ) / 1024 ) > @Max_log
        AND database_id = DB_ID();

Instances to collect from

Select all

Databases to collect from

Collection frequency

1800

Use collected or calculated values

Leave the Use a calculated rate of change between collections check box unchecked

Metric collection

Enabled

Alert definition

Alert name

Number of transaction log files increased

Description

This alert is raised when the number of log files greater than 10 GB goes above the defined thresholds.

Raise an alert when the metric value goes

Above the defined threshholds

Default threshold values

High:	Disabled
Medium:	0
Low:	Disabled

Note: These thresholds are intended as guideline values. If they seem too high or too low, replace them with values more suited to your environment.

Raise an alert when the threshold is passed for

1 collection

Alert is

Enabled

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Large transaction log files

Metric definition

Name

Description

The T-SQL query that will collect data

Instances to collect from

Databases to collect from

Collection frequency

Use collected or calculated values

Metric collection

Alert definition

Alert name

Description

Raise an alert when the metric value goes

Default threshold values

Raise an alert when the threshold is passed for

Alert is

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