Rules for an External Restore

Before you begin an external restore, keep the following rules in mind:

• You must externally restore from an external backup. Although the external backup is treated as a level-0 backup, it might actually be a non-Informix incremental backup.
• A warm external restore restores only noncritical storage spaces.
• You cannot externally restore temporary dbspaces.
• You cannot externally restore from regular ON–Bar backups.
• You cannot verify that you are restoring from the correct backup and that the storage media is readable using ON–Bar.
• If the external backups are from different times, the external restore uses the beginning logical log from the oldest backup.

These rules apply to cold external restores only:

• Salvage the logical logs (onbar -b -l -s) before you switch the disks that contain the critical storage spaces.
• If you are restoring critical dbspaces, the database server must be offline (Dynamic Server) or in microkernel mode (Extended Parallel Server).
• Point-in-time external restores must be cold and restore all storage spaces.
• 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 (IDS) or onutil ebr block ...onutil ebr unblock commit (XPS) command bracket.