What is PRAGMA Journal_mode Wal?

What is Pragma Journal_mode?

The journal_mode pragma gets or sets the journal mode which controls how the journal file is stored and processed. Following is the simple syntax. PRAGMA journal_mode; PRAGMA journal_mode = mode; PRAGMA database.

What is a SQLite WAL file?

Write-Ahead Log (WAL) Files. A write-ahead log or WAL file is used in place of a rollback journal when SQLite is operating in WAL mode. As with the rollback journal, the purpose of the WAL file is to implement atomic commit and rollback.

What is a WAL file?

The write-ahead log or "wal" file is a roll-forward journal that records transactions that have been committed but not yet applied to the main database. Details on the format of the wal file are describe in the WAL format subsection of the main file format document.

What is WAL in postgresql?

WAL (write-ahead log) is the log of changes made to the database cluster which is replayed either as part of the database recovery process when a database isn't shutdown correctly (such as when a crash occurs), or is used by standbys to replay the changes to replicate the database.