File with a .DB-WAL extension contains a WAL registry (Write-Ahead Log), generated automatically by a SQLite database (since the 3.7.0. version). It is a temporary file used in the process of storing all the modifications that are to be performed on a database, before they are implemented.

DB-WAL files are used by a database program, usually supporting regular light, built in databases, for instance in mobile applications or PCs. It is the alternative for the “rollback journal” database modification scheme. DB-WAL files, or the DB-SHM files can be encountered in the catalogue of an application using SQLite.