MSSQL on Windows: DB Transaction Log Free Space (\%) Performance

Microsoft.SQLServer.Windows.MonitorType.Database.TransactionLogSpaceFreePercent (UnitMonitorType)

Transaction Log Free Space (\%) monitor type for MSSQL DBs

Element properties:

Show References:
- Unit Monitors (1)

RunAs	Microsoft.SQLServer.Core.RunAs.Monitoring
Accessibility	Internal
Support Monitor Recalculate	False

Member Modules:

ID	Module Type	TypeId	RunAs
DS	DataSource	Microsoft.SQLServer.Windows.DataSource.DBSize	Default
ErrorCondition	ConditionDetection	System.ExpressionFilter	Default
HC	ConditionDetection	Microsoft.SQLServer.Windows.ConditionDetection.MultiValueSpaceHealthCalculator	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.
TimeoutSeconds	int	$Config/TimeoutSeconds$	Timeout (seconds)	Specifies the time the workflow is allowed to run before being closed and marked as failed.
HealthCalcMode	int	$Config/HealthCalcMode$	Health Calculation Mode	Defines how to track the health state. The following values are possible: "1" - prioritizes the health state based on the Threshold parameter expressed as a percentage term (\%), "2" - prioritizes the health state based on the Threshold parameter expressed as a capacity metric (MB), "3" - prioritizes the health state based on both the percentage term (\%) and the capacity metric (MB) thresholds, and uses the worst one to report the state.
Threshold	int	$Config/Threshold$	Threshold (\%)	The collected value will be compared against this parameter.
Value2Threshold	double	$Config/Value2Threshold$	Threshold (MB)	The collected value will be compared against this parameter.
AzureMaxFileSizeMB	int	$Config/AzureMaxFileSizeMB$	Azure Maximum File Size (MB)	The maximum size of data file stored in Azure BLOB Storage. The workflow will consider this value as a maximum storage capacity for each file.
NumSamples	int	$Config/NumSamples$	Number of samples	Indicates how many times a measured value should breach a threshold before the state is changed.
SqlExecTimeoutSeconds	int	$Config/SqlExecTimeoutSeconds$	Timeout for query execution (seconds)	The workflow will fail and register an event, if the query execution takes longer than the specified period.
SqlTimeoutSeconds	int	$Config/SqlTimeoutSeconds$	Timeout for database connection (seconds)	The workflow will fail and register an event, if it cannot access the database during the specified period.

Source Code:

<UnitMonitorType ID="Microsoft.SQLServer.Windows.MonitorType.Database.TransactionLogSpaceFreePercent" Accessibility="Internal" RunAs="SqlCoreLib!Microsoft.SQLServer.Core.RunAs.Monitoring">

  <MonitorTypeStates>

    <MonitorTypeState ID="Normal"/>

    <MonitorTypeState ID="Error"/>

  </MonitorTypeStates>

  <Configuration>

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

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

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

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

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

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

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

    <xsd:element xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="Value2PropertyName" type="xsd:string"/>

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

    <xsd:element xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="Value2Threshold" type="xsd:double"/>

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

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

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

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

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

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

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

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

    <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="SyncTime" type="xsd:string"/>

  </Configuration>

  <OverrideableParameters>

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

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

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

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

    <OverrideableParameter ID="Value2Threshold" Selector="$Config/Value2Threshold$" ParameterType="double"/>

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

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

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

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

  </OverrideableParameters>

  <MonitorImplementation>

    <MemberModules>

      <DataSource ID="DS" TypeID="Microsoft.SQLServer.Windows.DataSource.DBSize">

        <MachineName>$Config/MachineName$</MachineName>

        <NetbiosComputerName>$Config/NetbiosComputerName$</NetbiosComputerName>

        <InstanceName>$Config/InstanceName$</InstanceName>

        <DatabaseName>$Config/DatabaseName$</DatabaseName>

        <AzureMaxFileSizeMB>$Config/AzureMaxFileSizeMB$</AzureMaxFileSizeMB>

        <ConnectionString>$Config/ConnectionString$</ConnectionString>

        <InstanceVersion>$Config/InstanceVersion$</InstanceVersion>

        <InstanceEdition>$Config/InstanceEdition$</InstanceEdition>

        <MonitoringType>$Config/MonitoringType$</MonitoringType>

        <SqlExecTimeoutSeconds>$Config/SqlExecTimeoutSeconds$</SqlExecTimeoutSeconds>

        <SqlTimeoutSeconds>$Config/SqlTimeoutSeconds$</SqlTimeoutSeconds>

        <TimeoutSeconds>$Config/TimeoutSeconds$</TimeoutSeconds>

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

        <SyncTime>$Config/SyncTime$</SyncTime>

      </DataSource>

      <ConditionDetection ID="HC" TypeID="Microsoft.SQLServer.Windows.ConditionDetection.MultiValueSpaceHealthCalculator">

        <HealthCalcMode>$Config/HealthCalcMode$</HealthCalcMode>

        <StateType>TwoState</StateType>

        <Value1Name>$Config/ValuePropertyName$</Value1Name>

        <Value1StateDirection>BadLessT1</Value1StateDirection>

        <Threshold11>$Config/Threshold$</Threshold11>

        <Value2Name>$Config/Value2PropertyName$</Value2Name>

        <Value2StateDirection>BadLessT1</Value2StateDirection>

        <Threshold21>$Config/Value2Threshold$</Threshold21>

        <Publisher>SQLMonitoringWindows</Publisher>

        <ManagementGroupName>$Target/ManagementGroup/Name$</ManagementGroupName>

      </ConditionDetection>

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

        <Expression>

          <SimpleExpression>

            <ValueExpression>

              <XPathQuery Type="Integer">Property[@Name='__workflowState']</XPathQuery>

            </ValueExpression>

            <Operator>Equal</Operator>

            <ValueExpression>

              <Value Type="Integer">0</Value>

            </ValueExpression>

          </SimpleExpression>

        </Expression>

      </ConditionDetection>

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

        <Expression>

          <SimpleExpression>

            <ValueExpression>

              <XPathQuery Type="Integer">Property[@Name='__workflowState']</XPathQuery>

            </ValueExpression>

            <Operator>Greater</Operator>

            <ValueExpression>

              <Value Type="Integer">0</Value>

            </ValueExpression>

          </SimpleExpression>

        </Expression>

        <SuppressionSettings>

          <MatchCount>$Config/NumSamples$</MatchCount>

          <SampleCount>$Config/NumSamples$</SampleCount>

        </SuppressionSettings>

      </ConditionDetection>

    </MemberModules>

    <RegularDetections>

      <RegularDetection MonitorTypeStateID="Normal">

        <Node ID="NormalCondition">

          <Node ID="HC">

            <Node ID="DS"/>

          </Node>

        </Node>

      </RegularDetection>

      <RegularDetection MonitorTypeStateID="Error">

        <Node ID="ErrorCondition">

          <Node ID="HC">

            <Node ID="DS"/>

          </Node>

        </Node>

      </RegularDetection>

    </RegularDetections>

  </MonitorImplementation>

</UnitMonitorType>