Making a recoverable journal entry durable before installing its protected updates at their final locations. In this article the journal contains new record images, so recovery redoes committed changes rather than undoing uncommitted changes. The diagrams assume one isolated file-system transaction, fresh journal slots with unambiguous record identities, no other writer, and atomic storage writes for each record and marker. A crash loses volatile state; previously durable contents remain intact. Storage flushes are honored, and recovery finishes before the file system is exposed. These are model assumptions, not a claim that every physical file data block write is indivisible on arbitrary hardware.
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Write-ahead logging (WAL) is a standard technique used in database management systems and other data storage systems to ensure data integrity and durability in the event of a crash or failure. The primary concept behind WAL is to maintain a log of all changes to data before those changes are applied to the actual data storage. This approach helps to prevent data loss and maintain consistency.