WordPress.org

Nothing goes in the plugins directory.

1. Enter a configuration in db-config.php.

2. Deploy db-config.php in the directory that holds wp-config.php. This may be the WordPress root or one level above. It may also be anywhere else the web server can see it; in this case, define DB_CONFIG_FILE in wp-config.php.

3. Deploy db.php to the /wp-content/ directory. Simply placing this file activates it. To deactivate it, move it from that location or move the config file.

Any value of WP_USE_MULTIPLE_DB will be ignored by HyperDB.