UPDATE my_table SET column1 = REPLACE(column1, 'search string', 'replacement');
ALTER TABLE my_table_name AUTO_INCREMENT = 777;
mysql -e "show variables like 'datadir'"
show variables like 'datadir'
If you try to import dumped file, and there is such an error, try using mysql console with options and then import sql file
mysql -u root -p --max_allowed_packet=6400M
If you haven't acess to console or the previous doesn't work
set global max_allowed_packet=10000000000;