Can't connect to local MySQL

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Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (111)
and
Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)

That error i get like 7 times until now, but i don’t know what causes, sometimes when i save a template, sometimes when i just click a menu item, can you help me to solve this problem, its annoying, i have to wait about 5 minutes to enter to the site again

Now the error change, I’m unable to access to the manager, i get this error SQL Error: Unknown storage engine ‘InnoDB’ SELECT session_data FROM ucm_session WHERE session_id = ‘7a15a6078f51595aa0fffa635d4980be’ and like a hundred more in red alerts
https://www.dropbox.com/s/jmhye14wtxuse1n/Captura%20de%20pantalla%202014-10-29%2022.22.02.png?dl=0
https://www.dropbox.com/s/u1jl563gyvc6r64/Captura%20de%20pantalla%202014-10-29%2022.22.21.png?dl=0

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dkx15Can't connect to local MySQL