I have upgraded database with automatic upgrade tool of wordpress. After that when I tried to login in wordpress admin area. I have received this error message:
Database Error: Error establishing a database connection
– Username and password information in your wp-config.php file is incorrect. Please check with PHPMyAdmin and correct it or reset it. Also make necessary changes in wp-config.php file.
– Make sure that you have typed correct host name in wp-config.php file.
– Your hosting service provider’s database server is down. Hence, take a support from your hosting service provider.