What is maximum query size for mysql?
You can check your current server setting with:
SHOW VARIABLES LIKE 'max_allowed_packet';
This gives you the answer in bytes. for e.g max_allowed_packet=1048576 or 1 MiB
To increase the max_allowed_packet, open
my.ini/my.cnf under [mysqld] section.
Once the change is done you would have to restart the server.