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SET @start_global_value = @@global.innodb_large_prefix; SELECT @start_global_value; @start_global_value 1 Valid values are 'ON' and 'OFF' select @@global.innodb_large_prefix in (0, 1); @@global.innodb_large_prefix in (0, 1) 1 select @@global.innodb_large_prefix; @@global.innodb_large_prefix 1 select @@session.innodb_large_prefix; ERROR HY000: Variable 'innodb_large_prefix' is a GLOBAL variable show global variables like 'innodb_large_prefix'; Variable_name Value innodb_large_prefix ON show session variables like 'innodb_large_prefix'; Variable_name Value innodb_large_prefix ON select * from information_schema.global_variables where variable_name='innodb_large_prefix'; VARIABLE_NAME VARIABLE_VALUE INNODB_LARGE_PREFIX ON select * from information_schema.session_variables where variable_name='innodb_large_prefix'; VARIABLE_NAME VARIABLE_VALUE INNODB_LARGE_PREFIX ON set global innodb_large_prefix='OFF'; Warnings: Warning 131 Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html select @@global.innodb_large_prefix; @@global.innodb_large_prefix 0 select * from information_schema.global_variables where variable_name='innodb_large_prefix'; VARIABLE_NAME VARIABLE_VALUE INNODB_LARGE_PREFIX OFF select * from information_schema.session_variables where variable_name='innodb_large_prefix'; VARIABLE_NAME VARIABLE_VALUE INNODB_LARGE_PREFIX OFF set @@global.innodb_large_prefix=1; Warnings: Warning 131 Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html select @@global.innodb_large_prefix; @@global.innodb_large_prefix 1 select * from information_schema.global_variables where variable_name='innodb_large_prefix'; VARIABLE_NAME VARIABLE_VALUE INNODB_LARGE_PREFIX ON select * from information_schema.session_variables where variable_name='innodb_large_prefix'; VARIABLE_NAME VARIABLE_VALUE INNODB_LARGE_PREFIX ON set global innodb_large_prefix=0; Warnings: Warning 131 Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html select @@global.innodb_large_prefix; @@global.innodb_large_prefix 0 select * from information_schema.global_variables where variable_name='innodb_large_prefix'; VARIABLE_NAME VARIABLE_VALUE INNODB_LARGE_PREFIX OFF select * from information_schema.session_variables where variable_name='innodb_large_prefix'; VARIABLE_NAME VARIABLE_VALUE INNODB_LARGE_PREFIX OFF set @@global.innodb_large_prefix='ON'; Warnings: Warning 131 Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html select @@global.innodb_large_prefix; @@global.innodb_large_prefix 1 select * from information_schema.global_variables where variable_name='innodb_large_prefix'; VARIABLE_NAME VARIABLE_VALUE INNODB_LARGE_PREFIX ON select * from information_schema.session_variables where variable_name='innodb_large_prefix'; VARIABLE_NAME VARIABLE_VALUE INNODB_LARGE_PREFIX ON set session innodb_large_prefix='OFF'; ERROR HY000: Variable 'innodb_large_prefix' is a GLOBAL variable and should be set with SET GLOBAL set @@session.innodb_large_prefix='ON'; ERROR HY000: Variable 'innodb_large_prefix' is a GLOBAL variable and should be set with SET GLOBAL set global innodb_large_prefix=1.1; ERROR 42000: Incorrect argument type to variable 'innodb_large_prefix' set global innodb_large_prefix=1e1; ERROR 42000: Incorrect argument type to variable 'innodb_large_prefix' set global innodb_large_prefix=2; ERROR 42000: Variable 'innodb_large_prefix' can't be set to the value of '2' set global innodb_large_prefix=-3; ERROR 42000: Variable 'innodb_large_prefix' can't be set to the value of '-3' select @@global.innodb_large_prefix; @@global.innodb_large_prefix 1 select * from information_schema.global_variables where variable_name='innodb_large_prefix'; VARIABLE_NAME VARIABLE_VALUE INNODB_LARGE_PREFIX ON select * from information_schema.session_variables where variable_name='innodb_large_prefix'; VARIABLE_NAME VARIABLE_VALUE INNODB_LARGE_PREFIX ON set global innodb_large_prefix='AUTO'; ERROR 42000: Variable 'innodb_large_prefix' can't be set to the value of 'AUTO' SET @@global.innodb_large_prefix = @start_global_value; Warnings: Warning 131 Using innodb_large_prefix is deprecated and the parameter may be removed in future releases. See http://dev.mysql.com/doc/refman/5.7/en/innodb-file-format.html SELECT @@global.innodb_large_prefix; @@global.innodb_large_prefix 1