| Server IP : 104.21.38.3 / Your IP : 172.68.164.50 Web Server : Apache System : Linux krdc-ubuntu-s-2vcpu-4gb-amd-blr1-01.localdomain 5.15.0-142-generic #152-Ubuntu SMP Mon May 19 10:54:31 UTC 2025 x86_64 User : www ( 1000) PHP Version : 7.4.33 Disable Function : passthru,exec,system,putenv,chroot,chgrp,chown,shell_exec,popen,proc_open,pcntl_exec,ini_alter,ini_restore,dl,openlog,syslog,readlink,symlink,popepassthru,pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,imap_open,apache_setenv MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : OFF | Sudo : ON | Pkexec : ON Directory : /www/server/mysql/src/mysql-test/suite/sys_vars/r/ |
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SET @start_global_value = @@global.innodb_read_ahead_threshold; SELECT @start_global_value; @start_global_value 56 Valid values are between 0 and 64 select @@global.innodb_read_ahead_threshold between 0 and 64; @@global.innodb_read_ahead_threshold between 0 and 64 1 select @@global.innodb_read_ahead_threshold; @@global.innodb_read_ahead_threshold 56 select @@session.innodb_read_ahead_threshold; ERROR HY000: Variable 'innodb_read_ahead_threshold' is a GLOBAL variable show global variables like 'innodb_read_ahead_threshold'; Variable_name Value innodb_read_ahead_threshold 56 show session variables like 'innodb_read_ahead_threshold'; Variable_name Value innodb_read_ahead_threshold 56 select * from information_schema.global_variables where variable_name='innodb_read_ahead_threshold'; VARIABLE_NAME VARIABLE_VALUE INNODB_READ_AHEAD_THRESHOLD 56 select * from information_schema.session_variables where variable_name='innodb_read_ahead_threshold'; VARIABLE_NAME VARIABLE_VALUE INNODB_READ_AHEAD_THRESHOLD 56 set global innodb_read_ahead_threshold=10; select @@global.innodb_read_ahead_threshold; @@global.innodb_read_ahead_threshold 10 select * from information_schema.global_variables where variable_name='innodb_read_ahead_threshold'; VARIABLE_NAME VARIABLE_VALUE INNODB_READ_AHEAD_THRESHOLD 10 select * from information_schema.session_variables where variable_name='innodb_read_ahead_threshold'; VARIABLE_NAME VARIABLE_VALUE INNODB_READ_AHEAD_THRESHOLD 10 set session innodb_read_ahead_threshold=1; ERROR HY000: Variable 'innodb_read_ahead_threshold' is a GLOBAL variable and should be set with SET GLOBAL set global innodb_read_ahead_threshold=DEFAULT; select @@global.innodb_read_ahead_threshold; @@global.innodb_read_ahead_threshold 56 set global innodb_read_ahead_threshold=1.1; ERROR 42000: Incorrect argument type to variable 'innodb_read_ahead_threshold' set global innodb_read_ahead_threshold=1e1; ERROR 42000: Incorrect argument type to variable 'innodb_read_ahead_threshold' set global innodb_read_ahead_threshold="foo"; ERROR 42000: Incorrect argument type to variable 'innodb_read_ahead_threshold' set global innodb_read_ahead_threshold=' '; ERROR 42000: Incorrect argument type to variable 'innodb_read_ahead_threshold' select @@global.innodb_read_ahead_threshold; @@global.innodb_read_ahead_threshold 56 set global innodb_read_ahead_threshold=" "; ERROR 42000: Incorrect argument type to variable 'innodb_read_ahead_threshold' select @@global.innodb_read_ahead_threshold; @@global.innodb_read_ahead_threshold 56 set global innodb_read_ahead_threshold=-7; Warnings: Warning 1292 Truncated incorrect innodb_read_ahead_threshold value: '-7' select @@global.innodb_read_ahead_threshold; @@global.innodb_read_ahead_threshold 0 select * from information_schema.global_variables where variable_name='innodb_read_ahead_threshold'; VARIABLE_NAME VARIABLE_VALUE INNODB_READ_AHEAD_THRESHOLD 0 set global innodb_read_ahead_threshold=96; Warnings: Warning 1292 Truncated incorrect innodb_read_ahead_threshold value: '96' select @@global.innodb_read_ahead_threshold; @@global.innodb_read_ahead_threshold 64 select * from information_schema.global_variables where variable_name='innodb_read_ahead_threshold'; VARIABLE_NAME VARIABLE_VALUE INNODB_READ_AHEAD_THRESHOLD 64 set global innodb_read_ahead_threshold=0; select @@global.innodb_read_ahead_threshold; @@global.innodb_read_ahead_threshold 0 set global innodb_read_ahead_threshold=64; select @@global.innodb_read_ahead_threshold; @@global.innodb_read_ahead_threshold 64 SET @@global.innodb_read_ahead_threshold = @start_global_value; SELECT @@global.innodb_read_ahead_threshold; @@global.innodb_read_ahead_threshold 56