Nov 30 18:41:16 Znqxsz210 systemd[1]: Starting LSB: start and stop MySQL... Nov 30 18:41:19 Znqxsz210 mysqld[5515]: Starting MySQL... ERROR! The server quit without updating PID file (/www/server/data/Znqxsz210.pid). Nov 30 18:41:19 Znqxsz210 systemd[1]: mysqld.service: control process exited, code=exited status=1 Nov 30 18:41:19 Znqxsz210 systemd[1]: Failed to start LSB: start and stop MySQL. Nov 30 18:41:19 Znqxsz210 systemd[1]: Unit mysqld.service entered failed state. Nov 30 18:41:19 Znqxsz210 systemd[1]: mysqld.service failed.

https://dev.mysql.com/doc/refman/5.6/en/forcing-innodb-recovery.html

innodb_force_recovery = 2