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#################################################################### # Displaying default value # #################################################################### SELECT @@GLOBAL.table_open_cache_instances; @@GLOBAL.table_open_cache_instances 16 #################################################################### # Check that value cannot be set (this variable is settable only # # at start-up). # #################################################################### SET @@GLOBAL.table_open_cache_instances=1; ERROR HY000: Variable 'table_open_cache_instances' is a read only variable SELECT @@GLOBAL.table_open_cache_instances; @@GLOBAL.table_open_cache_instances 16 ################################################################# # Check if the value in GLOBAL Table matches value in variable # ################################################################# SELECT @@GLOBAL.table_open_cache_instances = VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME='table_open_cache_instances'; @@GLOBAL.table_open_cache_instances = VARIABLE_VALUE 1 SELECT @@GLOBAL.table_open_cache_instances; @@GLOBAL.table_open_cache_instances 16 SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME='table_open_cache_instances'; VARIABLE_VALUE 16 ###################################################################### # Check if accessing variable with and without GLOBAL point to same # # variable # ###################################################################### SELECT @@table_open_cache_instances = @@GLOBAL.table_open_cache_instances; @@table_open_cache_instances = @@GLOBAL.table_open_cache_instances 1 ###################################################################### # Check if variable has only the GLOBAL scope # ###################################################################### SELECT @@table_open_cache_instances; @@table_open_cache_instances 16 SELECT @@GLOBAL.table_open_cache_instances; @@GLOBAL.table_open_cache_instances 16 SELECT @@local.table_open_cache_instances; ERROR HY000: Variable 'table_open_cache_instances' is a GLOBAL variable SELECT @@SESSION.table_open_cache_instances; ERROR HY000: Variable 'table_open_cache_instances' is a GLOBAL variable