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what is Maximum size of a query in mysql?
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Votes: 5
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the max size would be limited by the variable max_allowed_packet
so, if you do a

show variables like 'max_allowed_packet'

it will show you the limit. By default, it is set to
1047552 bytes.

If you want to increase that, add a line to the server's
my.cnf file, in the [mysqld] section :

set-variable = max_allowed_packet=2M

and restart mysql server.

Also read
document Is length of sql query limited in MS_SQL Server ?

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