How to: Initialize a Transactional Subscriber from a Backup (Replication Transact-SQL Programming)
Although a subscription to a transactional publication is typically initialized with a snapshot, a subscription can be initialized from a backup using replication stored procedures. For more information, see Initializing a Transactional Subscription Without a Snapshot.
To initialize a transactional subscriber from a backup
For an existing publication, ensure that the publication supports the ability to initialize from backup by executing sp_helppublication (Transact-SQL) at the Publisher on the publication database. Note the value of allow_initialize_from_backup in the result set.
- If the value is 1, the publication supports this functionality.
- If the value is 0, execute sp_changepublication (Transact-SQL) at the Publisher on the publication database. Specify a value of allow_initialize_from_backup for **@property** and a value of true for **@value**.
For a new publication, execute sp_addpublication (Transact-SQL) at the Publisher on the publication database. Specify a value of true for allow_initialize_from_backup. For more information, see How to: Create a Publication (Replication Transact-SQL Programming).
Create a backup of the publication database using the BACKUP (Transact-SQL) statement.
Restore the backup on the Subscriber using the RESTORE (Transact-SQL) statement.
At the Publisher on the publication database, execute the stored procedure sp_addsubscription (Transact-SQL). Specify the following parameters:
- **@sync\_type** - a value of initialize with backup.
- **@backupdevicetype** - the type of backup device: logical (default), disk, or tape.
- **@backupdevicename** - the logical or physical backup device to use for the restore.
For a logical device, specify the name of the backup device specified when sp_addumpdevice was used to create the device.
For a physical device, specify a complete path and file name, such as
DISK = 'C:\Program Files\Microsoft SQL Server\MSSQL.1\BACKUP\Mybackup.dat'or
TAPE = '\\.\TAPE0'.
- (Optional) **@password** - a password that was provided when the backup set was created.
- (Optional) **@mediapassword** - a password that was provided when the media set was formatted.
- (Optional) **@fileidhint** - identifier for the backup set to be restored. For example, specifying 1 indicates the first backup set on the backup medium and 2 indicates the second backup set.
- (Optional for tape devices) **@unload** - specify a value of 1 (default) if the tape should be unloaded from the drive after the restore is complete and 0 if it should not be unloaded.
(Optional) For a pull subscription, execute sp_addpullsubscription (Transact-SQL) and sp_addpullsubscription_agent (Transact-SQL) at the Subscriber on the subscription database. For more information, see How to: Create a Pull Subscription (Replication Transact-SQL Programming).
(Optional) Start the Distribution Agent. For more information, see How to: Synchronize a Pull Subscription (Replication Programming) or How to: Synchronize a Push Subscription (Replication Programming).