Log Changes in Records
CA IDMS/DB uses journal record entries to log changes to the records in a database. A journal record entry is an image of a database record. As a database record is added, deleted, or modified, CA IDMS/DB writes a before image that contains the image of the record before update and an after image that contains the image of the record after update.
Journal Images For Modified Records
On a change to an existing record, the contents of before and after images are dependent on how the processing of the DML statement affects the database record:
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Affect on Database Record |
Contents of Journal Record Entry |
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Data in the record changes |
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Record's relationships in a set changes |
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Journal Images For New or Deleted Records
If a DML statement adds a new record occurrence into the database, the before image of the record is null. Similarly, if a DML statement removes a record occurrence, the after image of the record is null.
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