Meaning of before image journal | Babel Free

Definitions

A transaction log acting as a version of a database entry before an update is recorded.

Examples

“the server writes the original page on a before image journal maintained on disk (stable) storage.”

“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.”

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

“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.”

“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.”

“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.”

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

CEFR level