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