SQLite database format
SQLite databases are used by many programs including several forensics tools, e.g. Autopsy 3. SQLite 3 is current and older SQLite packages cannot use sqlite3 databases so use sqlite3 tools.
Write-Ahead Log (WAL)
The default method by which SQLite implements atomic commit and rollback is a rollback journal. In version 3.7.0 a "Write-Ahead Log" option was added.