Differences Between Journaling and Write Image Journaling Differences Between Journaling and Write Image Journaling Do not confuse the InterSystems IRIS journal with the write image journal (also known as the WIJ), which is described in Write Image Journaling and Recovery. Journaling and write image journaling have different functions, as follows: Journaling provides a complete record of all database modifications that have already been written to the database. In the event that some modifications are lost, for example because they occurred after the most recent backup of a recovered database, you restore them to the database by restoring the contents of the journal file. Write image journaling provides a record of all database modifications that are not yet written to the database. When a system crash occurs, the system automatically writes the contents of the write image journal to the database when it restarts.
