This tutorial can be used to recover data from broken mysql, for example if you get error
[ERROR] Plugin 'InnoDB' init function returned error.
[ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
[ERROR] Unknown/unsupported storage engine: InnoDB
or any other
InnoDB: Doing recovery: scanned up to log sequence number 2939851178008
150629 19:19:22 InnoDB: Error: page 7 log sequence number 2951677991096
InnoDB: is in the future! Current system log sequence number 2939851178008.
InnoDB: Your database may be corrupt or you may have copied the InnoDB
InnoDB: tablespace but not the InnoDB log files. See