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SET @start_global_value = @@global.optimizer_trace_features; SELECT @start_global_value; @start_global_value greedy_search=on,range_optimizer=on,dynamic_range=on,repeated_subselect=on select @@global.optimizer_trace_features; @@global.optimizer_trace_features greedy_search=on,range_optimizer=on,dynamic_range=on,repeated_subselect=on select @@session.optimizer_trace_features; @@session.optimizer_trace_features greedy_search=on,range_optimizer=on,dynamic_range=on,repeated_subselect=on show global variables like 'optimizer_trace_features'; Variable_name Value optimizer_trace_features greedy_search=on,range_optimizer=on,dynamic_range=on,repeated_subselect=on show session variables like 'optimizer_trace_features'; Variable_name Value optimizer_trace_features greedy_search=on,range_optimizer=on,dynamic_range=on,repeated_subselect=on select * from information_schema.global_variables where variable_name='optimizer_trace_features'; VARIABLE_NAME VARIABLE_VALUE OPTIMIZER_TRACE_FEATURES greedy_search=on,range_optimizer=on,dynamic_range=on,repeated_subselect=on select * from information_schema.session_variables where variable_name='optimizer_trace_features'; VARIABLE_NAME VARIABLE_VALUE OPTIMIZER_TRACE_FEATURES greedy_search=on,range_optimizer=on,dynamic_range=on,repeated_subselect=on set global optimizer_trace_features=2; select @@global.optimizer_trace_features; @@global.optimizer_trace_features greedy_search=off,range_optimizer=on,dynamic_range=off,repeated_subselect=off set session optimizer_trace_features=2; select @@session.optimizer_trace_features; @@session.optimizer_trace_features greedy_search=off,range_optimizer=on,dynamic_range=off,repeated_subselect=off set global optimizer_trace_features=0; select @@global.optimizer_trace_features; @@global.optimizer_trace_features greedy_search=off,range_optimizer=off,dynamic_range=off,repeated_subselect=off set session optimizer_trace_features=0; select @@session.optimizer_trace_features; @@session.optimizer_trace_features greedy_search=off,range_optimizer=off,dynamic_range=off,repeated_subselect=off set session optimizer_trace_features=default; select @@session.optimizer_trace_features; @@session.optimizer_trace_features greedy_search=off,range_optimizer=off,dynamic_range=off,repeated_subselect=off set global optimizer_trace_features=1.1; ERROR 42000: Incorrect argument type to variable 'optimizer_trace_features' set global optimizer_trace_features=1e1; ERROR 42000: Incorrect argument type to variable 'optimizer_trace_features' set session optimizer_trace_features="foobar"; ERROR 42000: Variable 'optimizer_trace_features' can't be set to the value of 'foobar' SET @@global.optimizer_trace_features = @start_global_value; SELECT @@global.optimizer_trace_features; @@global.optimizer_trace_features greedy_search=on,range_optimizer=on,dynamic_range=on,repeated_subselect=on