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SET @start_global_value = @@global.innodb_tmpdir;
SELECT @start_global_value;
@start_global_value
NULL
select @@session.innodb_tmpdir;
@@session.innodb_tmpdir
NULL
show global variables like 'innodb_tmpdir';
Variable_name Value
innodb_tmpdir
show session variables like 'innodb_tmpdir';
Variable_name Value
innodb_tmpdir
select * from information_schema.global_variables where variable_name='innodb_tmpdir';
VARIABLE_NAME VARIABLE_VALUE
INNODB_TMPDIR
select * from information_schema.session_variables where variable_name='innodb_tmpdir';
VARIABLE_NAME VARIABLE_VALUE
INNODB_TMPDIR
set global innodb_tmpdir=@@global.tmpdir;
set session innodb_tmpdir=@@global.tmpdir;
set global innodb_tmpdir=1.1;
ERROR 42000: Incorrect argument type to variable 'innodb_tmpdir'
set global innodb_tmpdir=1e1;
ERROR 42000: Incorrect argument type to variable 'innodb_tmpdir'
set global innodb_tmpdir=repeat('a',1000);
ERROR 42000: Variable 'innodb_tmpdir' can't be set to the value of 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa...'
show warnings;
Level Code Message
Warning 1210 Path length should not exceed 512 bytes
Error 1231 Variable 'innodb_tmpdir' can't be set to the value of 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa...'
SET @@global.innodb_tmpdir = @start_global_value;
SELECT @@global.innodb_tmpdir;
@@global.innodb_tmpdir
NULL