Before you begin an external backup, block the database server or one or more coservers. Blocking forces a checkpoint, flushes buffers to disk, and blocks user transactions that involve temporary tables. During the blocking operation, users can access that database server or coserver in read-only mode. Then you can physically back up or copy the data to another set of disks or storage media using operating-system or third-party tools. When you complete the external backup, unblock the database server so that transactions can resume. You should include all the chunk files in each storage space, administrative files, such as ONCONFIG, and the emergency boot file, in an external backup.
ON–Bar treats an external backup as equivalent to a level-0 backup. You cannot perform an external backup and then use ON–Bar to perform a level-1 backup, or vice versa because ON–Bar does not have any record of the external backup. For more information, see Performing an External Backup.
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