Rules for an external restore

Before you begin an external restore, know what you can and cannot restore from an external backup and be aware of the rules for an external restore.

These requirements and rules are:
  • You must externally restore from an external backup. Although the external backup is treated as a level-0 backup, it might actually be an incremental backup that was created by another source than Informix®.
  • You cannot externally restore temporary dbspaces.
  • You cannot externally restore from regular ontape backups.
  • You cannot verify that you are restoring from the correct backup and that the storage media is readable with ontape.
  • If the external backups are from different times, the external restore uses the beginning logical log from the oldest backup.
  • Salvage the logical logs (ontape -l) before you switch the disks that contain the critical storage spaces.
  • If you are restoring critical dbspaces, the database server must be offline.
  • If you are restoring the rootdbs, disable mirroring during the restore.
  • The external backups of all critical dbspaces of the database server instance must have been simultaneous. All critical dbspaces must have been backed up within the same onmode -c block … onmode -c unblock command bracket.
Parent topic: Data that is restored in an external restore