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select @@global.debug_sync; ERROR HY000: Variable 'debug_sync' is a SESSION variable select @@session.debug_sync; @@session.debug_sync ON - signals: '' show global variables like "debug_sync"; Variable_name Value show session variables like "debug_sync"; Variable_name Value debug_sync ON - signals: '' select * from information_schema.global_variables where variable_name="debug_sync"; VARIABLE_NAME VARIABLE_VALUE select * from information_schema.session_variables where variable_name="debug_sync"; VARIABLE_NAME VARIABLE_VALUE DEBUG_SYNC ON - signals: '' set @@session.debug_sync=1; ERROR 42000: Incorrect argument type to variable 'debug_sync' set @@session.debug_sync=1.1; ERROR 42000: Incorrect argument type to variable 'debug_sync' set @@session.debug_sync=1e1; ERROR 42000: Incorrect argument type to variable 'debug_sync'