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.
    Coordinate terms: after image journal, mirror server journal
    • 1983, Association for Computing Machinery. Special Interest Group on Management of Data (contributor), Proceedings, page 111:
      the server writes the original page on a before image journal maintained on disk (stable) storage.
    • 1985, ACM Special Interest Group in Operating Systems (contributor), Proceedings of the Tenth ACM Symposium on Operating Systems Principles, 1-4 December 1985, Orcas Island, Washington, Volume 19, page 55:
      In the course of the integration effort, and converting an existing relational database management system to use the Data Management (DM) system, some problems were encountered which motivated an extension of the "before image journal" concept.
    • 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.
    • 1995 April 7, Norman O. Morgan, “Pick database system and RDBMS”, in comp.databases.pick‎[1] (Usenet):
      If a system crash or power failure occurs, a recovery process mass processes all before-image journals to roll all in-process transactions back to a "clean point" before allowing users back on the system.
    • 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.
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