MSSQL 2012: DB Engine Page Life Expectancy (s) monitor type

Microsoft.SQLServer.2012.DBEngine.PageLifeExpectancy.MonitorType (UnitMonitorType)

DB Engine Page Life Expectancy (s) monitor type for 2012 DBs

Element properties:

Show References:
- Unit Monitors (1)

RunAs	Microsoft.SQLServer.SQLProbeAccount
Accessibility	Internal
Support Monitor Recalculate	False

Member Modules:

ID	Module Type	TypeId	RunAs
DS	DataSource	Microsoft.SQLServer.2012.DBEngine.PageLifeExpectancy.DataSourceMapped	Default
CSC	ConditionDetection	System.Performance.ConsecutiveSamplesCondition	Default
ErrorCondition	ConditionDetection	System.ExpressionFilter	Default
NormalCondition	ConditionDetection	System.ExpressionFilter	Default

Overrideable Parameters:

ID	ParameterType	Selector	Display Name	Description
IntervalSeconds	int	$Config/IntervalSeconds$	Interval (seconds)	The recurring interval of time in seconds in which to run the workflow.
Threshold	int	$Config/Threshold$	Threshold	Threshold
NumSamples	int	$Config/NumSamples$	Number of samples	Indicates how many times a measured value should breach a threshold before the state is changed.

Source Code:

<UnitMonitorType ID="Microsoft.SQLServer.2012.DBEngine.PageLifeExpectancy.MonitorType" Accessibility="Internal" RunAs="SQL!Microsoft.SQLServer.SQLProbeAccount">

  <MonitorTypeStates>

    <MonitorTypeState ID="Normal"/>

    <MonitorTypeState ID="Error"/>

  </MonitorTypeStates>

  <Configuration>

    <xsd:element xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="IntervalSeconds" type="xsd:integer"/>

    <xsd:element xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="Threshold" type="xsd:integer"/>

    <xsd:element xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="NumSamples" type="xsd:integer"/>

  </Configuration>

  <OverrideableParameters>

    <OverrideableParameter ID="IntervalSeconds" Selector="$Config/IntervalSeconds$" ParameterType="int"/>

    <OverrideableParameter ID="Threshold" Selector="$Config/Threshold$" ParameterType="int"/>

    <OverrideableParameter ID="NumSamples" Selector="$Config/NumSamples$" ParameterType="int"/>

  </OverrideableParameters>

  <MonitorImplementation>

    <MemberModules>

      <DataSource ID="DS" TypeID="Microsoft.SQLServer.2012.DBEngine.PageLifeExpectancy.DataSourceMapped">

        <IntervalSeconds>$Config/IntervalSeconds$</IntervalSeconds>

      </DataSource>

      <ConditionDetection ID="CSC" TypeID="SystemPerf!System.Performance.ConsecutiveSamplesCondition">

        <Threshold>$Config/Threshold$</Threshold>

        <Direction>less</Direction>

      </ConditionDetection>

      <ConditionDetection ID="NormalCondition" TypeID="System!System.ExpressionFilter">

        <Expression>

          <SimpleExpression>

            <ValueExpression>

              <XPathQuery Type="Double">Value</XPathQuery>

            </ValueExpression>

            <Operator>Less</Operator>

            <ValueExpression>

              <Value Type="Double">$Config/NumSamples$</Value>

            </ValueExpression>

          </SimpleExpression>

        </Expression>

      </ConditionDetection>

      <ConditionDetection ID="ErrorCondition" TypeID="System!System.ExpressionFilter">

        <Expression>

          <SimpleExpression>

            <ValueExpression>

              <XPathQuery Type="Double">Value</XPathQuery>

            </ValueExpression>

            <Operator>GreaterEqual</Operator>

            <ValueExpression>

              <Value Type="Double">$Config/NumSamples$</Value>

            </ValueExpression>

          </SimpleExpression>

        </Expression>

      </ConditionDetection>

    </MemberModules>

    <RegularDetections>

      <RegularDetection MonitorTypeStateID="Normal">

        <Node ID="NormalCondition">

          <Node ID="CSC">

            <Node ID="DS"/>

          </Node>

        </Node>

      </RegularDetection>

      <RegularDetection MonitorTypeStateID="Error">

        <Node ID="ErrorCondition">

          <Node ID="CSC">

            <Node ID="DS"/>

          </Node>

        </Node>

      </RegularDetection>

    </RegularDetections>

  </MonitorImplementation>

</UnitMonitorType>