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MSSQL on Windows: DB Virtual Log File Count

Microsoft.SQLServer.Windows.CollectionRule.Database.VLFCount (Rule)

SQL on Windows DBs Virtual Log Files performance collection rule

Knowledge Base article:

Summary

The number of VLFs in all physical log files for this database. Each physical transaction log file is divided internally into numerous virtual log files, or VLFs.

Overridable Parameters

Name

Description

Default Value

Enabled

Enables or disables the workflow.

No

Interval (seconds)

The recurring interval of time in seconds in which to run the workflow.

900

Synchronization Time

The synchronization time specified by using a 24-hour format. May be omitted.

 

Timeout (seconds)

Specifies the time the workflow is allowed to run before being closed and marked as failed.

300

Timeout for query execution (seconds)

The workflow will fail and register an event, if the query execution takes longer than the specified period.

60

Timeout for database connection (seconds)

The workflow will fail and register an event, if it cannot access the database during the specified period.

15

Element properties:

TargetMicrosoft.SQLServer.Windows.Database
CategoryPerformanceCollection
EnabledFalse
Alert GenerateFalse
RemotableTrue

Member Modules:

ID Module Type TypeId RunAs 
DS DataSource Microsoft.SQLServer.Windows.DataSource.VLFCountPerfOptimized Default
WriteToDB WriteAction Microsoft.SystemCenter.CollectPerformanceData Default
WriteToDW WriteAction Microsoft.SystemCenter.DataWarehouse.PublishPerformanceData Default

Source Code:

<Rule ID="Microsoft.SQLServer.Windows.CollectionRule.Database.VLFCount" Enabled="false" Target="SqlDiscW!Microsoft.SQLServer.Windows.Database" ConfirmDelivery="false" Remotable="true" Priority="Normal" DiscardLevel="100">

  <Category>PerformanceCollection</Category>

  <DataSources>

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

      <MachineName>$Target/Host/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/MachineName$</MachineName>

      <NetbiosComputerName>$Target/Host/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/NetbiosComputerName$</NetbiosComputerName>

      <InstanceName>$Target/Host/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/InstanceName$</InstanceName>

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

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

      <InstanceVersion>$Target/Host/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/Version$</InstanceVersion>

      <InstanceEdition>$Target/Host/Property[Type="SqlCoreLib!Microsoft.SQLServer.Core.DBEngine"]/Edition$</InstanceEdition>

      <MonitoringType>$Target/Host/Property[Type="SqlDiscW!Microsoft.SQLServer.Windows.DBEngine"]/MonitoringType$</MonitoringType>

      <IntervalSeconds>900</IntervalSeconds>

      <SyncTime/>

      <TimeoutSeconds>300</TimeoutSeconds>

      <SqlExecTimeoutSeconds>60</SqlExecTimeoutSeconds>

      <SqlTimeoutSeconds>15</SqlTimeoutSeconds>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="WriteToDB" TypeID="SC!Microsoft.SystemCenter.CollectPerformanceData"/>

    <WriteAction ID="WriteToDW" TypeID="SCDW!Microsoft.SystemCenter.DataWarehouse.PublishPerformanceData"/>

  </WriteActions>

</Rule>