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In case of broken databases (InnoDB engine) try:

Either delete the whole db and restart rm /var/lib/mysql/ibdata1

#OR

mysql --innodb_force_recovery=1 /*+1 if it fails ... wird in 5.5.44 nicht erkannt #http://dev.mysql.com/doc/refman/5.6/en/forcing-innodb-recovery.html#

mysqlcheck --all-databases

mysqldump --force --compress --triggers --routines --create-options -uroot -p --all-databases > /home/pi/alldb-recovery.sql

mysqladmin -uUSERNAME -pPASSWORD shutdown

rm -fdr /var/lib/mysql

mkdir /var/lib/mysql \ chown -R mysql:mysql /var/lib/mysql \ /usr/local/bin/mysql_install_db \ chown -R mysql:mysql /var/lib/mysql

mysql -uroot --compress < /home/pi/alldb-recovery.sql

/usr/local/bin/mysqladmin -uroot flush-privileges

#OR

``sudo /etc/init.d/mysql status`

``sudo /etc/init.d/mysql stop`

sudo cp -r /var/lib/mysql /home/pi/sicherung/mysql

sudo rm -r /var/lib/mysql/klima_growbox

sudo rm /var/lib/mysql/ibdata

sudo rm /var/lib/mysql/ib_logfile0

sudo rm /var/lib/mysql/ib_logfile1

``sudo /etc/init.d/mysql start`

http://www.tecmint.com/mysqladmin-commands-for-database-administration-in-linux/