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SET @start_global_value = @@global.gtid_executed_compression_period; SELECT @start_global_value; @start_global_value 1000 # # It exists as a global variable # SELECT @@GLOBAL.gtid_executed_compression_period; @@GLOBAL.gtid_executed_compression_period 1000 SHOW GLOBAL VARIABLES LIKE 'gtid_executed_compression_period'; Variable_name Value gtid_executed_compression_period 1000 SELECT * FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME = 'gtid_executed_compression_period'; VARIABLE_NAME VARIABLE_VALUE GTID_EXECUTED_COMPRESSION_PERIOD 1000 # # It is not a session variable # SELECT @@SESSION.gtid_executed_compression_period; ERROR HY000: Variable 'gtid_executed_compression_period' is a GLOBAL variable SET SESSION gtid_executed_compression_period= 2; ERROR HY000: Variable 'gtid_executed_compression_period' is a GLOBAL variable and should be set with SET GLOBAL SHOW SESSION VARIABLES LIKE 'gtid_executed_compression_period'; Variable_name Value gtid_executed_compression_period 1000 SHOW SESSION VARIABLES LIKE 'gtid_executed_compression_period'; Variable_name Value gtid_executed_compression_period 1000 SELECT * FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME ='gtid_executed_compression_period'; VARIABLE_NAME VARIABLE_VALUE GTID_EXECUTED_COMPRESSION_PERIOD 1000 # # Verify that it's writable # SET GLOBAL gtid_executed_compression_period= 0; SELECT @@GLOBAL.gtid_executed_compression_period; @@GLOBAL.gtid_executed_compression_period 0 SET GLOBAL gtid_executed_compression_period= 5000; SELECT @@GLOBAL.gtid_executed_compression_period; @@GLOBAL.gtid_executed_compression_period 5000 SET GLOBAL gtid_executed_compression_period= 4294967295; SELECT @@GLOBAL.gtid_executed_compression_period; @@GLOBAL.gtid_executed_compression_period 4294967295 # # Verify that it could not bet set with invalid values # SET GLOBAL gtid_executed_compression_period= -1; Warnings: Warning 1292 Truncated incorrect gtid_executed_compression_period value: '-1' SELECT @@GLOBAL.gtid_executed_compression_period; @@GLOBAL.gtid_executed_compression_period 0 SET GLOBAL gtid_executed_compression_period= 4294967296; Warnings: Warning 1292 Truncated incorrect gtid_executed_compression_period value: '4294967296' SELECT @@GLOBAL.gtid_executed_compression_period; @@GLOBAL.gtid_executed_compression_period 4294967295 set global gtid_executed_compression_period= 1.1; ERROR 42000: Incorrect argument type to variable 'gtid_executed_compression_period' set global gtid_executed_compression_period= 1e1; ERROR 42000: Incorrect argument type to variable 'gtid_executed_compression_period' set global gtid_executed_compression_period= "foobar"; ERROR 42000: Incorrect argument type to variable 'gtid_executed_compression_period' SET @@global.gtid_executed_compression_period= @start_global_value; SELECT @@global.gtid_executed_compression_period; @@global.gtid_executed_compression_period 1000