For a backup session, ON–Bar requests the contents of storage spaces and logical logs from the database server and passes them to the storage manager. The storage manager stores the data on storage media. For a restore session, ON–Bar requests the backed-up data from the storage manager and restores it on the database server.
The onbar_d, onbar_w, and onbar_m processes write status and error messages to the ON–Bar activity log. The onbar_w and onbar_m processes write information to the emergency boot files that are used in a cold restore.
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