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################################################################################ # gtid_executed_compression_period # # It is a global variable only and can be set dynamically. # It has UINT type and accepts numbers from 0 to 4294967295. Default value is 1000. # # This test verifies the variable can be set, selected and showed correctly. ################################################################################ SET @start_global_value = @@global.gtid_executed_compression_period; SELECT @start_global_value; --echo # --echo # It exists as a global variable --echo # SELECT @@GLOBAL.gtid_executed_compression_period; SHOW GLOBAL VARIABLES LIKE 'gtid_executed_compression_period'; --disable_warnings SELECT * FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME = 'gtid_executed_compression_period'; --enable_warnings --echo # --echo # It is not a session variable --echo # --error ER_INCORRECT_GLOBAL_LOCAL_VAR SELECT @@SESSION.gtid_executed_compression_period; --error ER_GLOBAL_VARIABLE SET SESSION gtid_executed_compression_period= 2; SHOW SESSION VARIABLES LIKE 'gtid_executed_compression_period'; SHOW SESSION VARIABLES LIKE 'gtid_executed_compression_period'; --disable_warnings SELECT * FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME ='gtid_executed_compression_period'; --enable_warnings --echo # --echo # Verify that it's writable --echo # SET GLOBAL gtid_executed_compression_period= 0; SELECT @@GLOBAL.gtid_executed_compression_period; SET GLOBAL gtid_executed_compression_period= 5000; SELECT @@GLOBAL.gtid_executed_compression_period; SET GLOBAL gtid_executed_compression_period= 4294967295; SELECT @@GLOBAL.gtid_executed_compression_period; --echo # --echo # Verify that it could not bet set with invalid values --echo # # Allowed value range: (0, UINT_MAX32) # Value lower than allowed range SET GLOBAL gtid_executed_compression_period= -1; SELECT @@GLOBAL.gtid_executed_compression_period; # Value higher than allowed range SET GLOBAL gtid_executed_compression_period= 4294967296; SELECT @@GLOBAL.gtid_executed_compression_period; # Incompatible value types --error ER_WRONG_TYPE_FOR_VAR set global gtid_executed_compression_period= 1.1; --error ER_WRONG_TYPE_FOR_VAR set global gtid_executed_compression_period= 1e1; --error ER_WRONG_TYPE_FOR_VAR set global gtid_executed_compression_period= "foobar"; SET @@global.gtid_executed_compression_period= @start_global_value; SELECT @@global.gtid_executed_compression_period;