How To Merge Contents Of SQLite 3.7 WAL File Into Main Database File

With WAL (Write-Ahead-Logging) enabled in SQLite 3.7 (which is the default for Core Data on iOS 7), how do I merge/commit the content from the -wal file back into the main database

Solution 1:

From the command line, do this:

1. sqlite3 MyDatabase.sqlite
2. VACUUM;
3. CTRL-D to exit the sqlite console.

Done!

The -wal file should now have a size of 0 and everything should be in your main database file.

Solution 2:

Do a checkpoint, i.e., execute PRAGMA wal_checkpoint.

Solution 3:

In an app "DB Browser for SQLite" open a database and switch between Journal Mode from "WAL" to "Off" and tap a button "Apply", and switch back to "WAL".