database snapshot

A database snapshot records the current state of the data in a database as if all active transactions were rolled back.

To use DROP DATABASE, the database context of the connection cannot be the same as the database or database snapshot to be dropped.

Generally, a database snapshot does not expose metadata of its own, but it does expose metadata from its source database.

Is the name of the database or database snapshot to which the user context is switched.

Each database snapshot is transaction-consistent with the source database as it existed at the time of the snapshot's creation.

Explained that uncommitted transactions have been rolled back in a newly created database snapshot .

After each test run, the database can be quickly returned to its prior state by reverting the database snapshot.

Issue a DROP DATABASE statement, specifying the name of the database snapshot to be dropped.

Specifies the name of a database snapshot to be removed.

However , it is possible to use it indirectly for reporting purposes by creating a database snapshot on the mirror database .

A database snapshot inherits the security constraints of its source database at the time of snapshot creation.

A database snapshot is a read-only offline copy of a database, and is not related to a replication snapshot.

A database snapshot captures the point in time at which snapshot creation began , minus any uncommitted transactions .

A revert operation requires that the specified database snapshot is the only one on the database.

In a revert operation, the database snapshot takes the place of a full database backup.

Identify the database snapshot to which you want to revert the database.

DBCC CHECKFILEGROUP uses an internal database snapshot to provide the transactional consistency that it must have to perform these checks.

Revert a database to the point in time captured by a database snapshot.

DBCC CHECKTABLE uses an internal database snapshot to provide the transactional consistency that it must have to perform these checks.

Because a database snapshot is read-only, a log file cannot be specified.

For a database snapshot, size reflects the maximum space that the snapshot can ever use for the file.

If either the database or the database snapshot is corrupted, reverting from a snapshot is likely to be impossible.

A database snapshot must be created and remain on the same server instance as the source database.

Explains database snapshot concepts and provides specific guidelines for creating and administering database snapshots.

The database snapshot provides clients with read-only access to the data in the database as it existed when the snapshot was created.

However, if a user error occurs in an online database, you can revert the database to a database snapshot that predates the error.

Corrected technical error to clarify that you cannot bring a filegroup online when a database snapshot exists.

Unlike a regular backup set, the database snapshot is an incomplete copy of the database files.

Clients can query a database snapshot, which makes it useful for writing reports based on the data at the time of snapshot creation.

Specifies that the database being created is a database snapshot of the source database specified by.

A collation name cannot be specified on a database snapshot.

Is the name of a database snapshot.

DBCC CHECKCATALOG uses an internal database snapshot to provide the transactional consistency that it needs to perform these checks.

You cannot change any of the specifications of the database snapshot files.

If a database snapshot exists for the distribution database, it must be dropped before disabling distribution.

Because a database snapshot provides a static view of a database, a snapshot can extend access to data from a particular point in time.

In Enterprise Edition, you can now initialize subscriptions to snapshot and transactional publications by using a database snapshot.

An internal database snapshot uses sparse alternate data streams of the original database files.

Before reverting, you should familiarize yourself with the information in Reverting to a Database Snapshot.

This section contains examples of reverting a database to a database snapshot.

If a database snapshot exists for the publication database, it must be dropped before disabling publishing.

If creating a database snapshot fails, the snapshot becomes suspect and must be deleted.

Except for file space, a database snapshot consumes roughly as many resources as a database.

A database snapshot cannot be detached or attached.

If the database owner changed since creation of the database snapshot, you may want to update the database owner of the reverted database.

If your application happens to have a high update workload, the database snapshot monitoring may reveal a large number of log pages read.

LOG ON cannot be specified on a database snapshot.

When you drop a database snapshot, all user connections to it are terminated.

RESTORE DATABASE supports reverting a database to a database snapshot and supports the STOPAT option.

If a database snapshot runs out of disk space, it is marked as suspect and must be dropped.

Is the name of the new database snapshot.

Filegroup cannot be specified on a database snapshot.

DBCC CHECKDB uses an internal database snapshot for the transactional consistency needed to perform these checks.

Added information about clearing the plan cache to the "Dropping a Database Snapshot" section.

Reverting from a database snapshot is not intended for media recovery.

Select the size column from either sys. Database_files in the database snapshot or from sys. Master_files.

Before running the first round, an application developer or tester can create a database snapshot on the test database.

A database snapshot is a read-only, static view of a database, the source database.

Changes the database context to the specified database or database snapshot.

When you create a database snapshot, the source database will typically have open transactions.

Database and database snapshot names must comply with the rules for identifiers.

Clarified the database snapshot restriction for offline files.

Documented that an use database snapshot can be dropped.

If either the database or the database snapshot is corrupted, reverting from a snapshot is unlikely to correct the problem.

The following example reverts a database to a database snapshot.

Before the snapshot becomes available, the open transactions are rolled back to make the database snapshot transactionally consistent.

In this case, a database snapshot cannot be created because of internal restrictions.

Identify the database snapshot that you want to drop.

Produces character-mode bulk copy program output of all tables from a database snapshot.

Added managing a test database as another reason to use a database snapshot.

The reverted database retains the permissions and configuration (such as database owner and recovery model) of the database snapshot.

For creating a database snapshot, specifies a list of files in the source database.

Users can manually connect to a database snapshot by means of SQL Server Management Studio.

Each database snapshot requires a unique database name.

Any database snapshot that exists on the database must first be dropped.

Produces native-mode bulk copy program output of all tables from a database snapshot.

During database snapshot creation, sparse files are created by using the file names in the CREATE DATABASE statement.

From the database snapshot, note the counters in Listing 3 and monitor the ratio among these counters.

Any user who can create a database can create a database snapshot.

Causes DBCC CHECKTABLE to obtain a shared table lock instead of using an internal database snapshot.

You cannot drop files from a database snapshot.

A database snapshot exists on the database.

For an example of how to create this database snapshot, see How to: Create a Database Snapshot (Transact-SQL).

Causes DBCC CHECKDB to obtain locks instead of using an internal database snapshot.

Users can read from one database snapshot while another is being created or deleted.

Database snapshot names must be unique within an instance of SQL Server and comply with the rules for identifiers.

Dropping a database snapshot deletes the database snapshot from SQL Server and deletes the sparse files that are used by the snapshot.

This is because bringing a file back online involves restoring it, which is not possible if a database snapshot exists on the database.

A database snapshot that is created by a user stores its data in one or more sparse files.

Dropping a database snapshot clears the plan cache for the instance of SQL Server.

In Microsoft SQL Server 2005, you use SQL Server 2005 statements for creating, reverting to, and deleting a database snapshot.

The database snapshot monitor can be used to determine the number of transactions performed per second, as follows

An internal database snapshot is not created when a DBCC command is executed

You can then leverage the database snapshot to identify the sort activities at the database level

The following DBCC commands operate on an internal read-only database snapshot that SQL Server Database Engine creates.

How to: Revert a Database to a Database Snapshot (Transact-SQL)

when you create a database snapshot , the other

To create a database snapshot

For an example of how to create this database snapshot, see