what do these mean?

I am getting two erros, constantly reported to me, and I have no clue how to fix it!

Please help me!

heres the first one

Link-ID == false, connect failed
mysql error: Can't connect to local MySQL server through socket
'/var/lib/mysql/mysql.sock' (2)

and heres the second one

also

there are a couple like this

Invalid SQL: SELECT COUNT(title) AS starts FROM thread WHERE postusername='J'L''
AND open!='10'
mysql error: You have an error in your SQL syntax near 'L'' AND open!='10'' at
line 1

And they all appear to be the same user, dose this accur often, just regular errors, are is something most likely wrong with my datatbase?

thanks a lot guys

and pleas someone help me out!

[Admin]

1) A server error, nothing to do with vBulletin I think.

2) Take a look at the hack by tubedogg for number of threads user started in profile for this fix.