SQLite Write-Ahead Logging
The default method by which SQLite implements atomic commit and rollback is a rollback journal. Beginning with version 3.7.0 (2010-07-21), a new "Write-Ahead Log" option (hereafter referred to as "WAL") is available.
Write-Ahead Logging Small. Fast. Reliable. Choose any three. Home Menu About Documentation Download License Support Purchase Search About Documentation Download Support Purchase Search Documentation Search Changelog Write-Ahead Logging Table Of Contents 1. Overview 2. How WAL Works 2.1. Checkpointing 2.2. Concurrency 2.3. Performance Considerations 3. Activating And Configuring WAL Mode 3.1. Automatic Checkpoint 3.2. Application-Initiated Checkpoints 3.3. Persistence of WAL mode 4. The WAL File 5. Read-Only Databases 6. Avoiding Excessively Large WAL Files 7. Implementation Of Shared-Memory Fo
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