Auto Update Statistics Async Configuration

Microsoft.SQLServer.2008.Database.Configuration.AutoUpdateStatAsync (UnitMonitor)

Monitors the auto update statistics async setting for the database

Knowledge Base article:

Summary

This monitor checks the Auto Update Statistics Asynchronous setting for this database. Since this monitor is a part of an overall standards requirement, an alert would be generated if the setting does not meet the specified standard.

Configuration

When the Auto Update Statistics Asynchronous setting is ON, statistics updates for the AUTO_UPDATE_STATISTICS option are asynchronous. The query optimizer does not wait for statistics updates to complete before it compiles queries. Setting this option to ON has no effect unless AUTO_UPDATE_STATISTICS is set to ON.

AUTO_UPDATE_STATISTICS_ASYNC {ON | OFF}

Causes

A warning alert will be raised if the option does not match the required setting. Out of the box, the monitor is configured to alert when this setting is set to “ON”.

The reason this database option is OFF by default is for backwards compatibility with existing applications. Since queries do not wait or block for statistics updates, there is a chance for temporary changes in performance if a query compiles and runs with old statistics. After the statistics are done updating, the same query would recompile against the updated statistics before the next run. But while the stats are updating, the query might have momentary performance problems since it was compiled against old statistics.

ASYNC update is probably the best choice for most applications since it minimizes blocking and waiting overall. Consider turning it ON, and if it works for your application, then disable this unit monitor.

Resolutions

This issue may be resolved by:

Changing the configuration setting for this database to match the expected value.
Overriding the expected value for this unit monitor for this specific database or all databases.

Alternatively, if this monitor is not of concern for this database:

Disabling the monitor using overrides for this specific database or all databases.
Disabling the top-level aggregate configuration monitor using overrides for this specific database or all databases.

External

See more detailed information about this setting: ALTER DATABASE SET Options (Transact-SQL)

Overrideable Parameters

Name	Description	Default Value
Alert Priority	Defines Alert Priority.	Normal
Alert Severity	Defines Alert Severity.	Warning
Disable Check for SQL Express	Enables or disables check for SQL Express version.	No
Enabled	Enables or disables the workflow.	No
Expected Value	To view the set of possible values, see "Configuration" section in the knowledge of this monitor.	OFF
Generates Alerts	Defines whether the workflow generates an Alert.	Yes
Interval (seconds)	The recurring interval of time in seconds in which to run the workflow.	43200
Timeout (seconds)	Specifies the time the workflow is allowed to run before being closed and marked as failed.	300

Element properties:

Target

Microsoft.SQLServer.2008.Database

Parent Monitor

Microsoft.SQLServer.2008.Database.AutomaticConfiguration

Category

ConfigurationHealth

Enabled

False

Alert Generate

True

Alert Severity

Warning

Alert Priority

Normal

Alert Auto Resolve

True

Monitor Type

Microsoft.SQLServer.2008.DBConfigurationStatus

Remotable

True

Accessibility

Public

Alert Message

Auto Update Statistics Async Configuration Error

The auto update statistics async setting for database "{0}" in SQL instance "{1}" on computer "{2}" is not set according to best practice.

RunAs

Default

Source Code:

<UnitMonitor ID="Microsoft.SQLServer.2008.Database.Configuration.AutoUpdateStatAsync" Accessibility="Public" Enabled="false" Target="SQL2008Core!Microsoft.SQLServer.2008.Database" ParentMonitorID="Microsoft.SQLServer.2008.Database.AutomaticConfiguration" Remotable="true" Priority="Normal" TypeID="Microsoft.SQLServer.2008.DBConfigurationStatus" ConfirmDelivery="false">

  <Category>ConfigurationHealth</Category>

  <AlertSettings AlertMessage="Microsoft.SQLServer.2008.Database.Configuration.AutoUpdateStatAsync.AlertMessage">

    <AlertOnState>Warning</AlertOnState>

    <AutoResolve>true</AutoResolve>

    <AlertPriority>Normal</AlertPriority>

    <AlertSeverity>Warning</AlertSeverity>

    <AlertParameters>

      <AlertParameter1>$Target/Property[Type="SQL!Microsoft.SQLServer.Database"]/DatabaseName$</AlertParameter1>

      <AlertParameter2>$Target/Host/Property[Type="SQL!Microsoft.SQLServer.ServerRole"]/InstanceName$</AlertParameter2>

      <AlertParameter3>$Target/Host/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</AlertParameter3>

    </AlertParameters>

  </AlertSettings>

  <OperationalStates>

    <OperationalState ID="ConfigurationValueOK" MonitorTypeStateID="ConfigurationValueOK" HealthState="Success"/>

    <OperationalState ID="ConfigurationValueNotOK" MonitorTypeStateID="ConfigurationValueNotOK" HealthState="Warning"/>

  </OperationalStates>

  <Configuration>

    <ConnectionString>$Target/Host/Property[Type="SQL!Microsoft.SQLServer.DBEngine"]/ConnectionString$</ConnectionString>

    <DatabaseName>$Target/Property[Type="SQL!Microsoft.SQLServer.Database"]/DatabaseName$</DatabaseName>

    <IntervalSeconds>43200</IntervalSeconds>

    <SyncTime/>

    <ConfigValue>AutoUpdateAsyncStat</ConfigValue>

    <ExpectedValue>OFF</ExpectedValue>

    <ExcludeOnExpress>false</ExcludeOnExpress>

    <SQLSKU>$Target/Host/Property[Type="SQL!Microsoft.SQLServer.DBEngine"]/Edition$</SQLSKU>

    <TimeoutSeconds>300</TimeoutSeconds>

  </Configuration>

</UnitMonitor>