i try to install multi-db refer to the manual. db column

Hi, i try to install multi-db refer to the manual.
db column moved to new database well.
But then check the front-end page,
occur error message 'establishing a database connection'.
What I have files to be erased or actions to be checked after installation?
( or modify define('DB_NAME', 'dbname') in wp-config.php ?)
please advice :slight_smile: