What does this mean?

[AmbitiousOne]

I've been averaging a lot of database errors lately, in the last month. I consistently get this message -

Database error in vBulletin :

mysql_connect() [function.mysql-connect]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (11)
/home/mysite/public_html/mysite/forums/includes/class_core.php on line 274

MySQL Error :
Error Number :
Date : Wednesday, April 30th 2008 @ 08:35:19 PM
Script : http://mysite.com/misc.php?do=cybstats
Referrer : http://mysite.com/misc.php?do=cybstats
IP Address : xxx.xxx.xxx.xxx
Username :
Classname : vB_Database

Not sure what it means, I blocked out some of the info just in case it would be bad to know my site or the ip address (person who recieved the error).

Well yea, I've been getting a lot of database error messages through email.


Here's another one. Now I'm not running any queries or anything, does the server, vb run queries on its own...because I'm getting kinda scared if someone is manually running queries and it's not me doing it.

Database error in vBulletin 3.6.9:

Invalid SQL:

SELECT *
FROM vb_session
WHERE sessionhash = 'f245e72410c445375109a5de4cae3bb4'
AND lastactivity > 1209607989
AND idhash = 'cd2b5af35d4a3cbbcf91f302da06ef9c';

MySQL Error : Lost connection to MySQL server during query
Error Number : 2013
Date : Wednesday, this date @ 08:32:57 PM
Script : mysite.com
Referrer :
IP Address : IP address xxxx.x.xx.xx.x
Username :
Classname : vB_Database