MySQL's maximum query size is primarily limited by the max_allowed_packet parameter. This parameter defines the maximum packet size that can be sent to the MySQL server in a single query.
By default, the size of max_allowed_packet is typically 4MB, but this value can be configured to be higher, such as 64MB or even larger. Adjusting this value is typically done to enable larger SQL statements, such as bulk inserts of large datasets.
For example, when handling large data import operations, if the data packet exceeds the current value of max_allowed_packet, MySQL returns an error. In such cases, the issue can be resolved by adjusting the parameter value. This is achieved by setting max_allowed_packet in the MySQL configuration file (my.cnf or my.ini) and restarting the MySQL service to apply the changes.
[mysqld] max_allowed_packet=64M
After restarting the MySQL service to apply the changes, it is important to consider the system's memory capacity, as setting the value too high may consume excessive memory resources.