MySQL Unable to lock ibdata1 error 11 fix

A bad shutdown can cause such erros on MySQL.

InnoDB: Unable to lock ./ibdata1, error: 11
InnoDB: Check that you do not already have another mysqld process
InnoDB: using the same InnoDB data or log files.
InnoDB: Error in opening ./ibdata1

For solution

mv ibdata1 ibdata1.bak
cp -a ibdata1.bak ibdata1
service mysqld restart
 
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