before image journal
noun1
Computing, Databases, Engineering, Mathematics, Natural sciences, Physical sciences, Sciences A transaction log acting as a version of a database entry before an update is recorded.
- the server writes the original page on a before image journal maintained on disk (stable) storage.1983, Association for Computing Machinery. Special Interest Group on Management of Data (contributor), Proceedings, page 111:
- 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.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:
4 more examples
- The before image journal is used for undoing the effects of aborted transactions, and for recovery from system crashes.1990, Sayyed M. Deen (editor), Practical Database Techniques, page 58:
- 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.1990, Kirby McCoy, VMS file system internals, page 49:
- 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.1991, Lilian Hobbs, Ken England, Comprehensive Guide to RDB-VMS, page 334:
- 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.1995 April 7, Norman O. Morgan, “Pick database system and RDBMS”, in comp.databases.pick (Usenet):