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# # Bug #19183565 CREATE DYNAMIC INNODB_TMPDIR VARIABLE TO CONTROL # WHERE INNODB WRITES TEMP FILES # # If innodb_tmpdir is NULL or "", temporary file will be created in # server configuration variable location(--tmpdir) create table t1(a int primary key)engine=innodb; show session variables like 'innodb_tmpdir'; Variable_name Value innodb_tmpdir alter table t1 add column b int not null; set global innodb_tmpdir=NULL; # Connection con1 show session variables like 'innodb_tmpdir'; Variable_name Value innodb_tmpdir alter table t1 add key(b); drop table t1; # innodb_tmpdir with invalid path. create table t1(a int primary key)engine=innodb; set global innodb_tmpdir='wrong_value'; ERROR 42000: Variable 'innodb_tmpdir' can't be set to the value of 'wrong_value' show warnings; Level Code Message Warning 1210 InnoDB: Path doesn't exist. Error 1231 Variable 'innodb_tmpdir' can't be set to the value of 'wrong_value' drop table t1; # innodb_tmpdir with mysql data directory path. create table t1(a text, b text, fulltext(a,b))engine=innodb; insert into t1 values('test1', 'test2'); insert into t1 values('text1', 'text2'); set global innodb_tmpdir = @@global.datadir; ERROR 42000: Variable 'innodb_tmpdir' can't be set to the value of 'MYSQL_DATADIR' show warnings; Level Code Message Warning 1210 InnoDB: Path Location should not be same as mysql data directory location. Error 1231 DATADIR/data/' drop table t1; # innodb_tmpdir with valid location. create table t1(a text, b text, fulltext(a,b))engine=innodb; insert into t1 values('test1', 'test2'); insert into t1 values('text1', 'text2'); set @tmpdir = @@global.tmpdir; set global innodb_tmpdir = @tmpdir; show session variables like 'innodb_tmpdir'; Variable_name Value innodb_tmpdir # Connection con3 alter table t1 add fulltext(b); set global innodb_tmpdir=NULL; drop table t1;