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SET @saved_value= @@GLOBAL.slave_preserve_commit_order; # # Verify it can be queried corrected in different ways. # SELECT @@GLOBAL.slave_preserve_commit_order; @@GLOBAL.slave_preserve_commit_order 0 SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME = 'slave_preserve_commit_order'; VARIABLE_VALUE OFF SHOW GLOBAL VARIABLES LIKE 'slave_preserve_commit_order'; Variable_name Value slave_preserve_commit_order OFF # # Verify it is not a session variable # SELECT @@SESSION.slave_preserve_commit_order; ERROR HY000: Variable 'slave_preserve_commit_order' is a GLOBAL variable SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME = 'slave_preserve_commit_order'; VARIABLE_VALUE OFF SHOW SESSION VARIABLES LIKE 'slave_preserve_commit_order'; Variable_name Value slave_preserve_commit_order OFF SET SESSION slave_preserve_commit_order= TRUE; ERROR HY000: Variable 'slave_preserve_commit_order' is a GLOBAL variable and should be set with SET GLOBAL SELECT @@global.slave_preserve_commit_order; @@global.slave_preserve_commit_order 0 # # Verify it can be set correctly # SET GLOBAL slave_preserve_commit_order= true; SELECT @@global.slave_preserve_commit_order; @@global.slave_preserve_commit_order 1 SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME = 'slave_preserve_commit_order'; VARIABLE_VALUE ON SET GLOBAL slave_preserve_commit_order= false; SELECT @@global.slave_preserve_commit_order; @@global.slave_preserve_commit_order 0 SET GLOBAL slave_preserve_commit_order= TRUE; SELECT @@global.slave_preserve_commit_order; @@global.slave_preserve_commit_order 1 SET GLOBAL slave_preserve_commit_order= FALSE; SELECT @@global.slave_preserve_commit_order; @@global.slave_preserve_commit_order 0 SET GLOBAL slave_preserve_commit_order= DEFAULT; SELECT @@global.slave_preserve_commit_order; @@global.slave_preserve_commit_order 0 # # It should throw an error when encountering invalid value # SET GLOBAL slave_preserve_commit_order= NULL; ERROR 42000: Variable 'slave_preserve_commit_order' can't be set to the value of 'NULL' SELECT @@global.slave_preserve_commit_order; @@global.slave_preserve_commit_order 0 SET GLOBAL slave_preserve_commit_order= ''; ERROR 42000: Variable 'slave_preserve_commit_order' can't be set to the value of '' SELECT @@global.slave_preserve_commit_order; @@global.slave_preserve_commit_order 0 SET GLOBAL slave_preserve_commit_order= 'GARBAGE'; ERROR 42000: Variable 'slave_preserve_commit_order' can't be set to the value of 'GARBAGE' SELECT @@global.slave_preserve_commit_order; @@global.slave_preserve_commit_order 0 SET GLOBAL slave_preserve_commit_order = @saved_value;