Edit File: innodb_random_read_ahead_basic.result
SET @start_global_value = @@global.innodb_random_read_ahead; SELECT @start_global_value; @start_global_value 0 Valid values are 'ON' and 'OFF' select @@global.innodb_random_read_ahead in (0, 1); @@global.innodb_random_read_ahead in (0, 1) 1 select @@global.innodb_random_read_ahead; @@global.innodb_random_read_ahead 0 select @@session.innodb_random_read_ahead; ERROR HY000: Variable 'innodb_random_read_ahead' is a GLOBAL variable show global variables like 'innodb_random_read_ahead'; Variable_name Value innodb_random_read_ahead OFF show session variables like 'innodb_random_read_ahead'; Variable_name Value innodb_random_read_ahead OFF select * from information_schema.global_variables where variable_name='innodb_random_read_ahead'; VARIABLE_NAME VARIABLE_VALUE INNODB_RANDOM_READ_AHEAD OFF select * from information_schema.session_variables where variable_name='innodb_random_read_ahead'; VARIABLE_NAME VARIABLE_VALUE INNODB_RANDOM_READ_AHEAD OFF set global innodb_random_read_ahead='ON'; select @@global.innodb_random_read_ahead; @@global.innodb_random_read_ahead 1 select * from information_schema.global_variables where variable_name='innodb_random_read_ahead'; VARIABLE_NAME VARIABLE_VALUE INNODB_RANDOM_READ_AHEAD ON select * from information_schema.session_variables where variable_name='innodb_random_read_ahead'; VARIABLE_NAME VARIABLE_VALUE INNODB_RANDOM_READ_AHEAD ON set @@global.innodb_random_read_ahead=0; select @@global.innodb_random_read_ahead; @@global.innodb_random_read_ahead 0 select * from information_schema.global_variables where variable_name='innodb_random_read_ahead'; VARIABLE_NAME VARIABLE_VALUE INNODB_RANDOM_READ_AHEAD OFF select * from information_schema.session_variables where variable_name='innodb_random_read_ahead'; VARIABLE_NAME VARIABLE_VALUE INNODB_RANDOM_READ_AHEAD OFF set global innodb_random_read_ahead=1; select @@global.innodb_random_read_ahead; @@global.innodb_random_read_ahead 1 select * from information_schema.global_variables where variable_name='innodb_random_read_ahead'; VARIABLE_NAME VARIABLE_VALUE INNODB_RANDOM_READ_AHEAD ON select * from information_schema.session_variables where variable_name='innodb_random_read_ahead'; VARIABLE_NAME VARIABLE_VALUE INNODB_RANDOM_READ_AHEAD ON set @@global.innodb_random_read_ahead='OFF'; select @@global.innodb_random_read_ahead; @@global.innodb_random_read_ahead 0 select * from information_schema.global_variables where variable_name='innodb_random_read_ahead'; VARIABLE_NAME VARIABLE_VALUE INNODB_RANDOM_READ_AHEAD OFF select * from information_schema.session_variables where variable_name='innodb_random_read_ahead'; VARIABLE_NAME VARIABLE_VALUE INNODB_RANDOM_READ_AHEAD OFF set session innodb_random_read_ahead='OFF'; ERROR HY000: Variable 'innodb_random_read_ahead' is a GLOBAL variable and should be set with SET GLOBAL set @@session.innodb_random_read_ahead='ON'; ERROR HY000: Variable 'innodb_random_read_ahead' is a GLOBAL variable and should be set with SET GLOBAL set global innodb_random_read_ahead=1.1; ERROR 42000: Incorrect argument type to variable 'innodb_random_read_ahead' set global innodb_random_read_ahead=1e1; ERROR 42000: Incorrect argument type to variable 'innodb_random_read_ahead' set global innodb_random_read_ahead=2; ERROR 42000: Variable 'innodb_random_read_ahead' can't be set to the value of '2' NOTE: The following should fail with ER_WRONG_VALUE_FOR_VAR (BUG#50643) set global innodb_random_read_ahead=-3; select @@global.innodb_random_read_ahead; @@global.innodb_random_read_ahead 1 select * from information_schema.global_variables where variable_name='innodb_random_read_ahead'; VARIABLE_NAME VARIABLE_VALUE INNODB_RANDOM_READ_AHEAD ON select * from information_schema.session_variables where variable_name='innodb_random_read_ahead'; VARIABLE_NAME VARIABLE_VALUE INNODB_RANDOM_READ_AHEAD ON set global innodb_random_read_ahead='AUTO'; ERROR 42000: Variable 'innodb_random_read_ahead' can't be set to the value of 'AUTO' SET @@global.innodb_random_read_ahead = @start_global_value; SELECT @@global.innodb_random_read_ahead; @@global.innodb_random_read_ahead 0