backupmediaset (Transact-SQL)

Artykuł
12/08/2014

Contains one row for each backup media set. This table is stored in the msdb database.

Column name	Data type	Description
media_set_id	int	Unique media set identification number. Identity, primary key.
media_uuid	uniqueidentifier	The UUID of the media set. All Microsoft SQL Server media sets have a UUID. For earlier versions of SQL Server, however, if a media set contains only one media family, the media_uuid column might be NULL (media_family_count is 1).
media_family_count	tinyint	Number of media families in the media set. Can be NULL.
name	nvarchar(128)	Name of the media set. Can be NULL. For more information, see MEDIANAME and MEDIADESCRIPTION in BACKUP (Transact-SQL).
description	nvarchar(255)	Textual description of the media set. Can be NULL. For more information, see MEDIANAME and MEDIADESCRIPTION in BACKUP (Transact-SQL).
software_name	nvarchar(128)	Name of the backup software that wrote the media label. Can be NULL.
software_vendor_id	int	Identification number of the software vendor that wrote the backup media label. Can be NULL. The value for Microsoft SQL Server is hexadecimal 0x1200.
MTF_major_version	tinyint	Major version number of Microsoft Tape Format used to generate this media set. Can be NULL.
mirror_count	tinyint	Number of mirrors in the media set.
is_password_protected	bit	Is the media set password protected: 0 = Not protected 1 = Protected
is_compressed	bit	Whether the backup is compressed: 0 = Not compressed 1 = Compressed During an msdb upgrade, this value is set to NULL. which indicates an uncompressed backup.

Uwagi

RESTORE VERIFYONLY FROM backup_device WITH LOADHISTORY populates the columns of the backupmediaset table with the appropriate values from the media-set header.

To reduce the number of rows in this table and in other backup and history tables, execute the sp_delete_backuphistory stored procedure.