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Purpose and Benefits
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Some of the primary purposes and benefits of using database snapshots are:
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Protecting data from user error Safeguarding data against administrative error
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Maintaining historical data for report generation Using a mirror database that you are maintaining for availability purposes TIP One of the great benefits of database snapshots is the ability to overcome user errors By creating database snapshots on a regular basis, you can mitigate the impact of user errors such as inadvertently deleting data, or an administrative error such as what might occur during a manual bulk-load process
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Creating and Using a Database Snapshot
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If users have permission to create a database, they have permission to create a snapshot If you re comfortable with T-SQL, snapshots are quite easy to create Unfortunately, SQL Server Management Studio does not have the tools available for the creation of database snapshots It must be done through T-SQL statements Before creating the snapshot, consider the size of the source database If you allow the snapshot to continue to grow, it can get as large as the source database, but no larger Make sure you have enough disk space to support it Once a snapshot is created, it can be queried as easily as a regular database We simply invoke the USE command to set the context of the snapshot The command to create the snapshot is a CREATE DATABASE command In the following exercise, we ll create a snapshot of the AdventureWorks database, modify the original database, and then query the snapshot to show the original data is still available Exercise 109: Create a Database Snapshot 1 Open an instance of SSMS, and create a new query window 2 Enter the following command to create a database snapshot of AdventureWorks:
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CREATE DATABASE AdventureWorks_Snapshot_0900 ON ( NAME = AdventureWorks_Data, FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL1\MSSQL\Data\AdventureWorks_Snapshot_0900ss' ) AS SNAPSHOT OF AdventureWorks;
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NOTE Note that we have included the name Snapshot and the time 0900 in the snapshot name and in the name of the file This is a common convention and especially useful if we have several snapshots and need to easily differentiate between them 3 Select the Databases container Right-click and select Refresh 4 Open the Database Snapshots container You should see the AdventureWorks_ Snapshot_0900 snapshot 5 Use the following query to read data from the snapshot:
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USE AdventureWorks_Snapshot_0900 GO SELECT * FROM PersonContact WHERE FirstName = 'Billy-Joe-Bob'
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10: Disaster Recovery
6 Use the following query to modify the AdventureWorks database by changing any persons with the first name of Billy-Joe-Bob to Mary-Joe-Marina In the next exercise, we ll use the database snapshot to revert to the original names
USE AdventureWorks; UPDATE PersonContact SET FirstName = 'Mary-Joe-Marina' WHERE FirstName = 'Billy-Joe-Bob' GO SELECT * FROM PersonContact WHERE FirstName = 'Billy-Joe-Bob'
7 Use the following query to read data from the snapshot and show that the original data is still available in the snapshot:
USE AdventureWorks_Snapshot_0900 GO SELECT * FROM PersonContact WHERE FirstName = 'Billy-Joe-Bob'
Managing Snapshots
When creating snapshots, it s best to include the name of the original database, an indication that this is a snapshot, and some type of sequence number such as time of day For example, in our exercise, we named the snapshot AdventureWorks_Snapshot_0900 Just by looking at the name, even a casual observer would know that this is a snapshot of the AdventureWorks database taken at 9 AM (0900) Sure, we could name it awss9 For the next five minutes, I would probably be able to remember what this is, but there are no guarantees I d have a clue what awss9 meant by next week Because one of the primary reasons to use database snapshots is to safeguard against user or administrative errors, it makes sense to create several snapshots a day Consider a travel agency where travel agents have accidentally deleted existing reservations in the past By creating several snapshots throughout the day, a DBA could retrieve data that was created after the first snapshot but deleted in the original database If we were only concerned about protecting our database from risky operations such as a manual bulk-load process, we could choose to create a single snapshot immediately before the start of the bulk-load If something were to go wrong during the bulkload, we could use the database snapshot to quickly recover Since these database snapshots continue to grow, a strategy of managing snapshots must include dropping older snapshots For example, if we did backups of the database every night, we could choose to drop the snapshots as soon as the backups were completed This would free up the space for new snapshots throughout the day, and if data was lost, it could be retrieved from the backups
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