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DB File Space (rollup)

Microsoft.SQLServer.2008.DBFileGroup.DBFileSpaceMonitorRollUp (DependencyMonitor)

Monitors the space available in a filegroup.

Knowledge Base article:

Summary

Monitors the space available in a file group and on the media hosting the file group. The space available on the media hosting the files is only included as part of the space available if auto grow is enabled for one of the file.

Causes

An unhealthy state is caused by having low available for this file group. Low available space can be caused by:

Use the following link to view the performance data: DB File Group Free Space Performance Data

No Auto Grow

For a file that has no auto grow, available space would be the difference between the initial size for a file and the used space.

Auto Grow Enabled

With auto grow enabled, the available disk space is included as part of the over available space. In addition to the difference between the file size and the used space, the available space for files with auto grow enabled would be the minimum of either the difference between the max size and the file size and the free space left on disk.

Low available space for database files that have auto grow could mean that the file is approaching the limits of the hosting logical drive. For files with auto grow enabled with a max size, low available space could also mean that the file is approaching the max size specified for a file.

The available space calculations also take into account that the file can also fail to grow if the growth amount of the file is greater than the amount left on disk and that the file cannot grow if the difference between the max size and the current file size is less than the growth amount. In these situations, available free space left on disk is not included as part of the available space because we cannot grow any longer.

Resolutions

This issue may be resolved by either:

See SQL Server Books Online: Files and File Groups Architecture

Element properties:

TargetMicrosoft.SQLServer.2008.DBFileGroup
Parent MonitorMicrosoft.SQLServer.2008.Database.DBFileGroupSpaceMonitor
AlgorithmBestOf
Source MonitorMicrosoft.SQLServer.2008.Monitoring.DBFileSpaceMonitor
RelationshipMicrosoft.SQLServer.2008.DBFileGroupHostsDBFile
CategoryPerformanceHealth
EnabledTrue
Alert GenerateTrue
Alert SeverityMatchMonitorHealth
Alert PriorityNormal
Alert Auto ResolveTrue
RemotableTrue
AccessibilityPublic
Alert Message
File group is running out of space
The file group "{0}" for the database "{1}" in SQL instance "{2}" on computer "{3}" is running out of space. See knowledge section for more details.

Source Code:

<DependencyMonitor ID="Microsoft.SQLServer.2008.DBFileGroup.DBFileSpaceMonitorRollUp" Accessibility="Public" Enabled="true" Target="SQL2008Core!Microsoft.SQLServer.2008.DBFileGroup" ParentMonitorID="Microsoft.SQLServer.2008.Database.DBFileGroupSpaceMonitor" Remotable="true" Priority="Normal" RelationshipType="SQL2008Core!Microsoft.SQLServer.2008.DBFileGroupHostsDBFile" MemberMonitor="Microsoft.SQLServer.2008.Monitoring.DBFileSpaceMonitor">

  <Category>PerformanceHealth</Category>

  <AlertSettings AlertMessage="Microsoft.SQLServer.2008.DBFileGroup.DBFileSpaceMonitorRollUp.AlertMessageResourceID">

    <AlertOnState>Warning</AlertOnState>

    <AutoResolve>true</AutoResolve>

    <AlertPriority>Normal</AlertPriority>

    <AlertSeverity>MatchMonitorHealth</AlertSeverity>

    <AlertParameters>

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

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

      <AlertParameter3>$Target/Host/Host/Property[Type="SQL!Microsoft.SQLServer.ServerRole"]/InstanceName$</AlertParameter3>

      <AlertParameter4>$Target/Host/Host/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</AlertParameter4>

    </AlertParameters>

  </AlertSettings>

  <Algorithm>BestOf</Algorithm>

  <MemberUnAvailable>Error</MemberUnAvailable>

</DependencyMonitor>