Edit File: optimizer_trace_basic.result
SET @start_global_value = @@global.optimizer_trace; SELECT @start_global_value; @start_global_value enabled=off,one_line=off select @@global.optimizer_trace; @@global.optimizer_trace enabled=off,one_line=off select @@session.optimizer_trace; @@session.optimizer_trace enabled=off,one_line=off show global variables like 'optimizer_trace'; Variable_name Value optimizer_trace enabled=off,one_line=off show session variables like 'optimizer_trace'; Variable_name Value optimizer_trace enabled=off,one_line=off select * from information_schema.global_variables where variable_name='optimizer_trace'; VARIABLE_NAME VARIABLE_VALUE OPTIMIZER_TRACE enabled=off,one_line=off select * from information_schema.session_variables where variable_name='optimizer_trace'; VARIABLE_NAME VARIABLE_VALUE OPTIMIZER_TRACE enabled=off,one_line=off set global optimizer_trace=1; select @@global.optimizer_trace; @@global.optimizer_trace enabled=on,one_line=off set session optimizer_trace=1; select @@session.optimizer_trace; @@session.optimizer_trace enabled=on,one_line=off set global optimizer_trace=0; select @@global.optimizer_trace; @@global.optimizer_trace enabled=off,one_line=off set session optimizer_trace=0; select @@session.optimizer_trace; @@session.optimizer_trace enabled=off,one_line=off set session optimizer_trace=default; select @@session.optimizer_trace; @@session.optimizer_trace enabled=off,one_line=off set global optimizer_trace=1.1; ERROR 42000: Incorrect argument type to variable 'optimizer_trace' set global optimizer_trace=1e1; ERROR 42000: Incorrect argument type to variable 'optimizer_trace' set session optimizer_trace="foobar"; ERROR 42000: Variable 'optimizer_trace' can't be set to the value of 'foobar' SET @@global.optimizer_trace = @start_global_value; SELECT @@global.optimizer_trace; @@global.optimizer_trace enabled=off,one_line=off