Persistence (computer science): Difference between revisions

Revision as of 05:36, 20 July 2010

Revision as of 18:24, 28 July 2010

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On startup, the journal is read and each event is reapplied to the system, avoiding data loss in the case of system failure or shutdown.

The entire "Undo/Redo" history of user commands in ana picture editing program, for example, when written to a file, constitutes a journal capable of recovering the state of an edited picture at any point in time.

Journals are used by [[journaling file system]]s and [[database management system]]s where they are also called "transaction logs" or "redo logs".