Rules for an External Backup

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

• The database server must be online or in quiescent mode during an external backup.
• Use ON–Bar to back up all logical logs including the current log so that you can restore the logical logs at the end of the external restore.
• Suspend continuous logical-log backups before you block the database server for an external backup. After the external backup is complete, resume the continuous logical-log backup.
  Extended Parallel Server

  To suspend continuous logical-log backup, use the onbar off Log backup coserver_id command. To resume continuous logical-log backup, use the onbar on Log backup coserver_id command. For more information, see Starting and Stopping ON-Bar Sessions (XPS).

  End of Extended Parallel Server
  Dynamic Server

  To stop continuous logical-log backup, use the CTRL-C command. To resume continuous logical-log backup, use the onbar -b -l -C command.

  End of Dynamic Server
• Wait until all ON–Bar backup sessions have completed before you block the database server. If any backup sessions are active, the block command displays an error message.
• Any OLTP work or queries are suspended while the database server is blocked. They resume after the database server is unblocked.
• All critical dbspaces of the database server instance must be backed up together simultaneously within the same command bracket of onmode -c block ... onmode -c unblock. Backups of different critical dbspaces done at different times cannot be restored to a consistent system.