my site shws this error can u guy please say y is this

Connection Problems

Sorry, SMF was unable to connect to the database. This may be caused by the server being busy. Please try again later.

but i dint do any configuration in last week and then site wrking until 2day but suddenly its shwing this message so can anyone please say wat to do
MASK ^_^ MAN Reviewed by MASK ^_^ MAN on . Smf shows some error my site shws this error can u guy please say y is this but i dint do any configuration in last week and then site wrking until 2day but suddenly its shwing this message so can anyone please say wat to do :( Rating: 5