Snapshot
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-->A database snapshot is a read-only, static view of a SQL Server database (the source database). The database snapshot is transactionally consistent with the source database as of the moment of the snapshot's creation. A database snapshot always resides on the same server instance as its source database. While database snapshots provide a read-only view of the data in the same state as when the snapshot was created, the size of the snapshot file grows as changes are made to the source database. For details, see the Feature Overview section below.
Multiple snapshots can exist on a given source database. Each database snapshot persists until it is explicitly dropped by the database owner.
Note
Database snapshots are unrelated to snapshot backups, snapshot isolation of transactions, or snapshot replication.
In this Topic:
Feature Overview
Database snapshots operate at the later in this topic.
If a source database becomes RECOVERY_PENDING, its database snapshots may become inaccessible. After the issue on the source database is resolved, however, its snapshots should become available again.
Reverting is unsupported for any NTFS read-only or NTFS compressed files in the database. Attempts to revert a database containing either of these types of filegroups will fail.
In a log shipping configuration, database snapshots can be created only on the primary database, not on a secondary database. If you switch roles between the primary server instance and a secondary server instance, you must drop all the database snapshots before you can set the primary database up as a secondary database.
A database snapshot cannot be configured as a scalable shared database.
FILESTREAM filegroups are not supported by database snapshots. If FILESTREAM filegroups exist in a source database, they are marked as offline in its database snapshots, and the database snapshots cannot be used for reverting the database.
Note
A SELECT statement that is executed on a database snapshot must not specify a FILESTREAM column; otherwise, the following error message will be returned: Could not continue scan with NOLOCK due to data movement.
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When statistics on a read-only snapshot are missing or stale, the Database Engine creates and maintains temporary statistics in tempdb. For more information, see Statistics.
Disk Space Requirements
Database snapshots consume disk space. If a database snapshot runs out of disk space, it is marked as suspect and must be dropped. (The source database, however, is not affected; actions on it continue normally.) Compared to a full copy of a database, however, snapshots are highly space efficient. A snapshot requires only enough storage for the pages that change during its lifetime. Generally, snapshots are kept for a limited time, so their size is not a major concern.
The longer you keep a snapshot, however, the more likely it is to use up available space. The maximum size to which a sparse file can grow is the size of the corresponding source database file at the time of the snapshot creation. If a database snapshot runs out of disk space, it must be deleted (dropped).
Note
Except for file space, a database snapshot consumes roughly as many resources as a database.
Database Snapshots with Offline Filegroups
Offline filegroups in the source database affect database snapshots when you try to do any of the following:
Create a snapshot
When a source database has one or more offline filegroups, snapshot creation succeeds with the filegroups offline. Sparse files are not created for the offline filegroups.
Take a filegroup offline
You can take a file offline in the source database. However, the filegroup remains online in database snapshots if it was online when the snapshot was created. If the queried data has changed since snapshot creation, the original data page will be accessible in the snapshot. However, queries that use the snapshot to access unmodified data in the filegroup are likely to fail with input/output (I/O) errors.
Bring a filegroup online
You cannot bring a filegroup online in a database that has any database snapshots. If a filegroup is offline at the time of snapshot creation or is taken offline while a database snapshot exists, the filegroup remains offline. This is because bringing a file back online involves restoring it, which is not possible if a database snapshot exists on the database.
Revert the source database to the snapshot
Reverting a source database to a database snapshot requires that all of the filegroups are online except for filegroups that were offline when the snapshot was created.
Related Tasks
See Also
Snapshot ( plural ). A, especially one taken quickly or in a moment of opportunity.He carried a snapshot of his daughter. A of something; a portrayal of something at a moment in time.The article offered a snapshot of life in that region.
( ) A or set of files captured at a particular time, often capable of being reloaded to restore the earlier state.This game is so hard that I find myself taking a snapshot every few seconds in case I get killed. ( ) A quick, unplanned or unexpected.