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select @@global.performance_schema_max_stage_classes;
@@global.performance_schema_max_stage_classes
123
select @@session.performance_schema_max_stage_classes;
ERROR HY000: Variable 'performance_schema_max_stage_classes' is a GLOBAL variable
show global variables like 'performance_schema_max_stage_classes';
Variable_name Value
performance_schema_max_stage_classes 123
show session variables like 'performance_schema_max_stage_classes';
Variable_name Value
performance_schema_max_stage_classes 123
select * from information_schema.global_variables
where variable_name='performance_schema_max_stage_classes';
VARIABLE_NAME VARIABLE_VALUE
PERFORMANCE_SCHEMA_MAX_STAGE_CLASSES 123
select * from information_schema.session_variables
where variable_name='performance_schema_max_stage_classes';
VARIABLE_NAME VARIABLE_VALUE
PERFORMANCE_SCHEMA_MAX_STAGE_CLASSES 123
set global performance_schema_max_stage_classes=1;
ERROR HY000: Variable 'performance_schema_max_stage_classes' is a read only variable
set session performance_schema_max_stage_classes=1;
ERROR HY000: Variable 'performance_schema_max_stage_classes' is a read only variable
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