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