EC
1978
MySQLERRORCommonConfigurationHIGH confidence

Incorrect argument type to variable

Production Risk

None — set statement is rejected.

What this means

The expression type provided to a SET statement does not match the expected type for the system variable. For example, providing a string to a numeric variable.

Why it happens
  1. 1SET GLOBAL max_connections = 'abc'; — string instead of integer.
  2. 2Providing a NULL or boolean to a variable that requires a specific type.
How to reproduce
trigger — this will error
trigger — this will error
SET GLOBAL max_connections = 'many';

expected output

ERROR 1232 (42000): Incorrect argument type to variable 'max_connections'.

Fix

Provide the correct type for the variable

Provide the correct type for the variable
SET GLOBAL max_connections = 500;

Why this works

Numeric system variables require integer values; check the expected type in the MySQL documentation.

Sources
Official documentation ↗

MySQL 8.0 — 1978 ER_WRONG_TYPE_FOR_VAR

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