This plugin must be in the "mu-plugins" directory. The db.php file "drop-in" must be in the wp-content directory. Normal plugin installation will not work.
Auto-update does not work for must-use plugins
Some plugins and themes that do not use the WP abstraction layer will break. This is contrary to WordPress API guidelines, contact the theme or plugin author.
Some plugins and themes may use queries that need additional translations added. Please report any you find in the sourceforge forums so the translation files can be updated. Please turn on query logging in wp-config.php and include your logs with the translation fix request.
Other plugins may also use a db.php drop-in. You can use both plugins, but it will requiring renaming files and adding lines
to db.php from the plugin. See the Installation section for more details.
Other plugins that use db.php and extend the db class with custom behavior will break.
Add additional translations for PostgreSQL and Sqlite