before image journal

English

Noun

before image journal (plural before image journals)

1. (computing, databases) A transaction log acting as a version of a database entry before an update is recorded.
   • 1990, Sayyed M. Deen (editor), Practical Database Techniques, page 58:

     The before image journal is used for undoing the effects of aborted transactions, and for recovery from system crashes.

   • 1990, Kirby McCoy, VMS file system internals, page 49:

     The location of the before image journal. An AI journal records changes to a file so that the journal can be used to roll a backup copy of the file forward.

   • 1991, Lilian Hobbs, Ken England, Comprehensive Guide to RDB-VMS, page 334:

     The process of recording all operations applied to a database. The type of information recorded depends on whether an after-image or a before-image journal file is created.

   • 2006, David L. Cannon, Timothy S. Bergmann, Brady Pamplin, CISA Certified Information Systems Auditor Study Guide, page 236:

     This capability is based on a transaction log used with a before-image journal and after-image journal.

   Coordinate term: after image journal