Sort warnings (last hour)

This example custom metric measures the number of sort warnings events per hour.

Install metric...

Metrics install automatically if you have SQL Monitor installed.

If you are using Redgate’s SQL Server monitoring tool, SQL Monitor, you can instantly install and run this metric on your servers.

This metric measures the number of sort warning events that occurred in the last hour. Sort warning operations that do not fit into memory can degrade query and server performance because multiple passes over the data are required to sort the data. It is important to optimize queries by removing them.

For more information, see http://www.simple-talk.com/sql/learn-sql-server/showplan-operator-of-the-week—sort/.

Note: This metric relies on SQL Server default trace. If this is not enabled, the metric will not work.

Metric definition

Name

Sort warnings (last hour)

Description

This metric measures the number of sort warnings events that occurred in the last hour. Sort warning operations that do not fit into memory can degrade query and server performance because multiple passes over the data are required to sort the data. It is important to optimize queries by removing them.

For more information, see http://www.simple-talk.com/sql/learn-sql-server/showplan-operator-of-the-week---sort/.

Note: This metric relies on SQL Server default trace. If this is not enabled, the metric will not work.

The T-SQL query that will collect data

Instances to collect from

Select all

Databases to collect from

master

Collection frequency

3600

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

Sort warnings

Description

This alert is raised when the number of sort warnings events that occurred in the last hour goes above a specified threshold. Sort warning operations that do not fit into memory can degrade query and server performance because multiple passes over the data are required to sort the data. It is important to optimize queries by removing them.

For more information, see http://www.simple-talk.com/sql/learn-sql-server/showplan-operator-of-the-week---sort/.

Raise an alert when the metric value goes

Above the defined threshholds

Default threshold values

High:50
Medium:10
Low:0

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

Raise an alert when the threshold is passed for

1 collection

Alert is

Enabled