ON–Bar supports level-0, level-1, and level-2 backups.
Level-0 backups can be time-consuming because ON–Bar writes all the disk pages to backup media. Level-1 and level-2 backups might take almost as much time as a level-0 backup because the database server must scan all the data to determine what has changed since the last backup. It takes less time to restore data from level-0, level-1, and level-2 backups than from level-0 backups and a long series of logical-log backups.
A level-1 backup takes less space and might take less time than a level-0 backup because only data that changed since the last level-0 backup is copied to the storage manager.
If you request an incremental backup where no previous incremental backup exists, ON–Bar automatically performs the lower-level backup. For example, if you request a level-1 backup but no level-0 backup exists for one of the dbspaces, ON–Bar automatically performs a level-0 backup of that dbspace and a level-1 backup of the other storage spaces.
If you request a whole-system level-1 backup and no level-0 backup exists, ON–Bar performs a whole-system level-0 backup. If you request a whole-system level-2 backup but the level-1 backup does not exist, ON–Bar performs a whole-system level-1 backup.
A level-2 backup takes less space and might take less time than a level-1 backup because only data that changed since the last level-1 backup is copied to the storage manager.
Home | [ Top of Page | Previous Page | Next Page | Contents | Index ]