Backup systems

A backup is a copy of one or more dbspaces (also called storage spaces) and logical logs that the database server maintains. You can also back up blobspaces and sbspaces.

The backup copy is typically written to a secondary storage medium such as disk or magnetic tape. Store the media offline and keep a copy off site if possible.

The backup copy is typically written to a secondary storage medium such as disk, magnetic tape, or optical disk. Store the media offline and keep a copy off site if possible.

Important: Database backups do not replace ordinary operating-system backups, which back up files other than HCL® OneDB® database files.
The following figure illustrates the basic concept of a database backup.
Figure 1: A backup of database server data

This figure shows database server data moving to backup media.

You do not always have to back up all the storage spaces. If some tables change daily but others rarely change, it is inefficient to back up the storage spaces that contain the unchanged tables every time that you back up the database server. You need to plan your backup schedule carefully to avoid long delays for backing up or restoring data.