When Macrium Reflect takes an image, it invokes Volume Shadow Copy Service (VSS). This is a Microsoft component which that takes a point-in-time snapshot of your file system. This then snapshot remains active until the imaging is completecompletes. For the majority of data this is enough to create creates a backup that results in a consistent system when restoredsystem upon restore.
However, database engines cache transactions for performance purposes. It is important to , therefore, to force the engine to ensure that everything is on the disk and coherent before the snapshot is taken.
MS SQL Server includes a VSS writer and automatically creates a coherent point-in-time snapshot. However, for databases that don't ship with a VSS writer, you need to make take an extra step steps when configuring the backup:
Note: The example below uses batch files. Create However, visual Basic (vbs) and executable (exe) files can also be invoked using the same naming convention.
- Use Notepad to create the following batch file (replace <XML File Name> with the name of your XML definition file):
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-
<XML File Name>_before_snapshot_wait.bat
- Save the file in the same folder as the backup XML file and make sure it contains the command(s) to stop the db service.
- Create the following batch file
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- :
<XML
...
File Name> _after_snapshot _wait.bat
- Save the file in the same folder as the backup XML file and make sure it contains the
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- commands to start the
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- database service.
This ensures that the db database service is stopped for the duration of the snapshot creation phase, usually less than a minute.
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