'#---------------------BS_STVARS_052_01----------------------#' SELECT COUNT(@@GLOBAL.tmpdir); COUNT(@@GLOBAL.tmpdir) 1 1 Expected '#---------------------BS_STVARS_052_02----------------------#' SET @@GLOBAL.tmpdir=1; ERROR HY000: Variable 'tmpdir' is a read only variable Expected error 'Read only variable' SELECT COUNT(@@GLOBAL.tmpdir); COUNT(@@GLOBAL.tmpdir) 1 1 Expected '#---------------------BS_STVARS_052_03----------------------#' SELECT @@GLOBAL.tmpdir = VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME='tmpdir'; @@GLOBAL.tmpdir = VARIABLE_VALUE 1 1 Expected SELECT COUNT(@@GLOBAL.tmpdir); COUNT(@@GLOBAL.tmpdir) 1 1 Expected SELECT COUNT(VARIABLE_VALUE) FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME='tmpdir'; COUNT(VARIABLE_VALUE) 1 1 Expected '#---------------------BS_STVARS_052_04----------------------#' SELECT @@tmpdir = @@GLOBAL.tmpdir; @@tmpdir = @@GLOBAL.tmpdir 1 1 Expected '#---------------------BS_STVARS_052_05----------------------#' SELECT COUNT(@@tmpdir); COUNT(@@tmpdir) 1 1 Expected SELECT COUNT(@@local.tmpdir); ERROR HY000: Variable 'tmpdir' is a GLOBAL variable Expected error 'Variable is a GLOBAL variable' SELECT COUNT(@@SESSION.tmpdir); ERROR HY000: Variable 'tmpdir' is a GLOBAL variable Expected error 'Variable is a GLOBAL variable' SELECT COUNT(@@GLOBAL.tmpdir); COUNT(@@GLOBAL.tmpdir) 1 1 Expected SELECT tmpdir = @@SESSION.tmpdir; ERROR 42S22: Unknown column 'tmpdir' in 'field list' Expected error 'Readonly variable'