A fresh installation of 2.2.1 resulted in following error due to incorrect database particulars. Is this an expected behaviour?

Warning: mysql_query() [function.mysql-query]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) in /{...}/include/dblayer/functions_mysql.inc.php on line 88

Warning: mysql_query() [function.mysql-query]: A link to the server could not be established in /{...}/include/dblayer/functions_mysql.inc.php on line 88


Warning:  [mysql error 2002] Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
SET NAMES "utf8" in /{...}/include/dblayer/functions_mysql.inc.php on line 654