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Backing Up, Restoring, and Synchronizing Databases (XMLA)

  • Άρθρο

In XML for Analysis, there are three commands that back up, restore, and synchronize databases:

  • The Backup command backs up a Microsoft SQL Server SQL Server Analysis Services database using an SQL Server Analysis Services backup file (.abf), as described in the section, Backing Up Databases.

  • The Restore command restores an SQL Server Analysis Services database from an .abf file, as described in the section, Restoring Databases.

  • The Synchronize command synchronizes one SQL Server Analysis Services database with the data and metadata of another database, as described in the section, Synchronizing Databases.

Backing Up Databases

As mentioned earlier, the Backup command backs up a specified SQL Server Analysis Services database to a backup file. The Backup command has various properties that let you specify the database to be backed up, the backup file to use, how to back up security definitions, and the remote partitions to be backed up.

Important

The Analysis Services service account must have permission to write to the backup location specified for each file. Also, the user must have one of the following roles: administrator role on the SQL Server Analysis Services instance, or a member of a database role with Full Control (Administrator) permissions on the database to be backed up.

Specifying the Database and Backup File

To specify the database to be backed up, you set the Object property of the Backup command. The Object property must contain an object identifier for a database, or an error occurs.

To specify the file that is to be created and used by the backup process, you set the File property of the Backup command. The File property should be set to a UNC path and file name for the backup file to be created.

Besides specifying which file to use for backup, you can set the following options for the specified backup file:

  • If you set the AllowOverwrite property to true, the Backup command overwrites the backup file if the specified file already exists. If you set the AllowOverwrite property to false, an error occurs if the specified backup file already exists.

  • If you set the ApplyCompression property to true, the backup file is compressed after the file is created.

  • If you set the Password property to any non-blank value, the backup file is encrypted by using the specified password.

    Important

    If ApplyCompression and Password properties are not specified, the backup file stores user names and passwords that are contained in connection strings in clear text. Data that is stored in clear text may be retrieved. For increased security, use the ApplyCompression and Password settings to both compress and encrypt the backup file.

Backing Up Security Settings

The Security property determines whether the Backup command backs up the security definitions, such as roles and permissions, defined on an SQL Server Analysis Services database. The Security property also determines whether the backup file includes the Windows user accounts and groups defined as members of the security definitions.

The value of the Security property is limited to one of the strings listed in the following table.

Value Description
SkipMembership Include security definitions, but exclude membership information, in the backup file.
CopyAll Include security definitions and membership information in the backup file.
IgnoreSecurity Exclude security definitions from the backup file.

Backing Up Remote Partitions

To back up remote partitions in the SQL Server Analysis Services database, you set the BackupRemotePartitions property of the Backup command to true. This setting causes the Backup command to create a remote backup file for each remote data source that is used to store remote partitions for the database.

For each remote data source to be backed up, you can specify its corresponding backup file by including a Location element in the Locations property of the Backup command. The Location element should have its File property set to the UNC path and file name of the remote backup file, and its DataSourceID property set to the identifier of the remote data source defined in the database.

Restoring Databases

The Restore command restores a specified SQL Server Analysis Services database from a backup file. The Restore command has various properties that let you specify the database to restore, the backup file to use, how to restore security definitions, the remote partitions to be stored, and the relocation relational OLAP (ROLAP) objects.

Important

For each backup file, the user who runs the restore command must have permission to read from the backup location specified for each file. To restore an SQL Server Analysis Services database that is not installed on the server, the user must also be a member of the server role for that SQL Server Analysis Services instance. To overwrite an SQL Server Analysis Services database, the user must have one of the following roles: a member of the server role for the SQL Server Analysis Services instance or a member of a database role with Full Control (Administrator) permissions on the database to be restored.

Note

After restoring an existing database, the user who restored the database might lose access to the restored database. This loss of access can occur if, at the time that the backup was performed, the user was not a member of the server role or was not a member of the database role with Full Control (Administrator) permissions.

Specifying the Database and Backup File

The DatabaseName property of the Restore command must contain an object identifier for a database, or an error occurs. If the specified database already exists, the AllowOverwrite property determines whether the existing database is overwritten. If the AllowOverwrite property is set to false and the specified database already exists, an error occurs.

You should set the File property of the Restore command to a UNC path and file name for the backup file to be restored to the specified database. You can also set the Password property for the specified backup file. If the Password property is set to any non-blank value, the backup file is decrypted by using the specified password. If the backup file was not encrypted, or if the specified password does not match the password used to encrypt the backup file, an error occurs.

Restoring Security Settings

The Security property determines whether the Restore command restores the security definitions, such as roles and permissions, defined on an SQL Server Analysis Services database. The Security property also determines whether the Restore command includes the Windows user accounts and groups defined as members of the security definitions as part of the restore process.

The value of this element is limited to one of the strings listed in the following table.

Value Description
SkipMembership Include security definitions, but exclude membership information, in the database.
CopyAll Include security definitions and membership information in the database.
IgnoreSecurity Exclude security definitions from the database.

Restoring Remote Partitions

For each remote backup file created during a previous Backup command, you can restore its associated remote partition by including a Location element in the Locations property of the Restore command. The DataSourceType property for each Location element must be excluded or explicitly set to Remote.

For each specified Location element, the SQL Server Analysis Services instance contacts the remote data source specified in the DataSourceID property to restore the partitions defined in the remote backup file specified in the File property. Besides the DataSourceID and File properties, the following properties are available for each Location element used to restore a remote partition:

  • To override the connection string for the remote data source specified in DataSourceID, you can set the ConnectionString property of the Location element to a different connection string. The Restore command will then use the connection string that is contained in the ConnectionString property. If ConnectionString is not specified, the Restore command uses the connection string stored in the backup file for the specified remote data source. You can use the ConnectionString setting to move a remote partition to a different remote instance. However, you cannot use the ConnectionString setting to restore a remote partition to the same instance that contains the restored database. In other words, you cannot use the ConnectionString property to make a remote partition into a local partition.

  • For each original folder used to store the remote partitions on the remote data source, you can specify a Folder element to indicate the new folder in which to restore all the remote partitions stored in the original folder. If a Folder element is not specified, the Restore command uses the original folders specified for the remote partitions that are contained in the remote backup file.

Relocating ROLAP Objects

The Restore command cannot restore aggregations or data for objects that use ROLAP storage because such information is stored in tables on an underlying relational data source. However, the metadata for ROLAP objects can be restored. To restore the metadata for ROLAP object, the Restore command re-creates the table structure on a relational data source.

You can use the Location element in a Restore command to relocate ROLAP objects. For each Location element used to relocate a data source, the DataSourceType property must be explicitly set to Local. You also have to set the ConnectionString property of the Location element to the connection string of the new location. During the restore, the Restore command will replace the connection string for the data source identified by the DataSourceID property of the Location element with the value of the ConnectionString property of the Location element.

Synchronizing Databases

The Synchronize command synchronizes the data and metadata of a specified SQL Server Analysis Services database with another database. The Synchronize command has various properties that let you specify the source database, how to synchronize security definitions, the remote partitions to be synchronized, and the synchronization of ROLAP objects.

Note

The Synchronize command can be executed only by server administrators and database administrators. Both the source and destination database must have the same database compatibility level.

Specifying the Source Database

The Source property of the Synchronize command contains two properties, ConnectionString and Object. The ConnectionString property contains the connection string of the instance that contains the source database, and the Object property contains the object identifier for the source database.

The destination database is the current database for the session in which the Synchronize command runs.

If the ApplyCompression property of the Synchronize command is set to true, the information sent from the source database to the destination database is compressed before being sent.

Synchronizing Security Settings

The SynchronizeSecurity property determines whether the Synchronize command synchronizes the security definitions, such as roles and permissions, defined on the source database. The SynchronizeSecurity property also determines whether the Sychronize command includes the Windows user accounts and groups defined as members of the security definitions.

The value of this element is limited to one of the strings listed in the following table.

Value Description
SkipMembership Include security definitions, but exclude membership information, in the destination database.
CopyAll Include security definitions and membership information in the destination database.
IgnoreSecurity Exclude security definitions from the destination database.

Synchronizing Remote Partitions

For each remote data source that exists on the source database, you can synchronize each associated remote partition by including a Location element in the Locations property of the Synchronize command. For each Location element, the DataSourceType property must be excluded or explicitly set to Remote.

To define and connect to a remote data source in the destination database, the Synchronize command uses the connection string defined in the ConnectionString property of the Location element. The Synchronize command then uses the DataSourceID property of the Location element to identify which remote partitions to synchronize. The Synchronizecommand synchronizes the remote partitions on the remote data source specified in the DataSourceID property on the source database with the remote data source specified in the DataSourceID property on the destination database.

For each original folder used to store the remote partitions on the remote data source on the source database, you can also specify a Folder element in the Location element. The Folder element indicates the new folder for the destination database in which to synchronize all the remote partitions stored in the original folder on the remote data source. If a Folder element is not specified, the Synchronize command uses the original folders specified for remote partitions that are contained in the source database.

Synchronizing ROLAP Objects

The Synchronize command cannot synchronize aggregations or data for objects that use ROLAP storage because such information is stored in tables on an underlying relational data source. However, the metadata for ROLAP objects can be synchronized. To synchronize the metadata, the Synchronize command recreates the table structure on a relational data source.

You can use the Location element in a Synchronize command to synchronize ROLAP objects. For each Location element used to relocate a data source, the DataSourceType property must be explicitly set to Local. . You also have to set the ConnectionString property of the Location element to the connection string of the new location. During synchronization, the Synchronize command will replace the connection string for the data source identified by the DataSourceID property of the Location element with the value of the ConnectionString property of the Location element.

See Also

Backup Element (XMLA)
Restore Element (XMLA)
Synchronize Element (XMLA)
Backup and Restore of Analysis Services Databases