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SET @start_global_value = @@global.innodb_adaptive_flushing; SELECT @start_global_value; @start_global_value 1 Valid values are 'ON' and 'OFF' select @@global.innodb_adaptive_flushing in (0, 1); @@global.innodb_adaptive_flushing in (0, 1) 1 select @@global.innodb_adaptive_flushing; @@global.innodb_adaptive_flushing 1 select @@session.innodb_adaptive_flushing; ERROR HY000: Variable 'innodb_adaptive_flushing' is a GLOBAL variable show global variables like 'innodb_adaptive_flushing'; Variable_name Value innodb_adaptive_flushing ON show session variables like 'innodb_adaptive_flushing'; Variable_name Value innodb_adaptive_flushing ON select * from information_schema.global_variables where variable_name='innodb_adaptive_flushing'; VARIABLE_NAME VARIABLE_VALUE INNODB_ADAPTIVE_FLUSHING ON select * from information_schema.session_variables where variable_name='innodb_adaptive_flushing'; VARIABLE_NAME VARIABLE_VALUE INNODB_ADAPTIVE_FLUSHING ON set global innodb_adaptive_flushing='OFF'; select @@global.innodb_adaptive_flushing; @@global.innodb_adaptive_flushing 0 select * from information_schema.global_variables where variable_name='innodb_adaptive_flushing'; VARIABLE_NAME VARIABLE_VALUE INNODB_ADAPTIVE_FLUSHING OFF select * from information_schema.session_variables where variable_name='innodb_adaptive_flushing'; VARIABLE_NAME VARIABLE_VALUE INNODB_ADAPTIVE_FLUSHING OFF set @@global.innodb_adaptive_flushing=1; select @@global.innodb_adaptive_flushing; @@global.innodb_adaptive_flushing 1 select * from information_schema.global_variables where variable_name='innodb_adaptive_flushing'; VARIABLE_NAME VARIABLE_VALUE INNODB_ADAPTIVE_FLUSHING ON select * from information_schema.session_variables where variable_name='innodb_adaptive_flushing'; VARIABLE_NAME VARIABLE_VALUE INNODB_ADAPTIVE_FLUSHING ON set global innodb_adaptive_flushing=0; select @@global.innodb_adaptive_flushing; @@global.innodb_adaptive_flushing 0 select * from information_schema.global_variables where variable_name='innodb_adaptive_flushing'; VARIABLE_NAME VARIABLE_VALUE INNODB_ADAPTIVE_FLUSHING OFF select * from information_schema.session_variables where variable_name='innodb_adaptive_flushing'; VARIABLE_NAME VARIABLE_VALUE INNODB_ADAPTIVE_FLUSHING OFF set @@global.innodb_adaptive_flushing='ON'; select @@global.innodb_adaptive_flushing; @@global.innodb_adaptive_flushing 1 select * from information_schema.global_variables where variable_name='innodb_adaptive_flushing'; VARIABLE_NAME VARIABLE_VALUE INNODB_ADAPTIVE_FLUSHING ON select * from information_schema.session_variables where variable_name='innodb_adaptive_flushing'; VARIABLE_NAME VARIABLE_VALUE INNODB_ADAPTIVE_FLUSHING ON set session innodb_adaptive_flushing='OFF'; ERROR HY000: Variable 'innodb_adaptive_flushing' is a GLOBAL variable and should be set with SET GLOBAL set @@session.innodb_adaptive_flushing='ON'; ERROR HY000: Variable 'innodb_adaptive_flushing' is a GLOBAL variable and should be set with SET GLOBAL set global innodb_adaptive_flushing=1.1; ERROR 42000: Incorrect argument type to variable 'innodb_adaptive_flushing' set global innodb_adaptive_flushing=1e1; ERROR 42000: Incorrect argument type to variable 'innodb_adaptive_flushing' set global innodb_adaptive_flushing=2; ERROR 42000: Variable 'innodb_adaptive_flushing' can't be set to the value of '2' set global innodb_adaptive_flushing=-3; ERROR 42000: Variable 'innodb_adaptive_flushing' can't be set to the value of '-3' select @@global.innodb_adaptive_flushing; @@global.innodb_adaptive_flushing 1 select * from information_schema.global_variables where variable_name='innodb_adaptive_flushing'; VARIABLE_NAME VARIABLE_VALUE INNODB_ADAPTIVE_FLUSHING ON select * from information_schema.session_variables where variable_name='innodb_adaptive_flushing'; VARIABLE_NAME VARIABLE_VALUE INNODB_ADAPTIVE_FLUSHING ON set global innodb_adaptive_flushing='AUTO'; ERROR 42000: Variable 'innodb_adaptive_flushing' can't be set to the value of 'AUTO' SET @@global.innodb_adaptive_flushing = @start_global_value; SELECT @@global.innodb_adaptive_flushing; @@global.innodb_adaptive_flushing 1