create table t1 (a int) engine myisam partition by range (a) subpartition by hash (a) (partition p0 VALUES LESS THAN (1) DATA DIRECTORY = 'MYSQLTEST_VARDIR/master-data/tmpdata' INDEX DIRECTORY = 'MYSQLTEST_VARDIR/master-data/tmpinx' (SUBPARTITION subpart00, SUBPARTITION subpart01)); Checking if file exists before alter ALTER TABLE t1 REORGANIZE PARTITION p0 INTO (partition p1 VALUES LESS THAN (1) DATA DIRECTORY = 'MYSQLTEST_VARDIR/master-data/tmpdata' INDEX DIRECTORY = 'MYSQLTEST_VARDIR/master-data/tmpinx' (SUBPARTITION subpart10, SUBPARTITION subpart11), partition p2 VALUES LESS THAN (2) DATA DIRECTORY = 'MYSQLTEST_VARDIR/master-data/tmpdata' INDEX DIRECTORY = 'MYSQLTEST_VARDIR/master-data/tmpinx' (SUBPARTITION subpart20, SUBPARTITION subpart21)); Checking if file exists after alter drop table t1; DROP TABLE IF EXISTS `example`; CREATE TABLE `example` ( `ID_EXAMPLE` int(10) unsigned NOT NULL AUTO_INCREMENT, `DESCRIPTION` varchar(30) NOT NULL, `LEVEL` smallint(5) unsigned DEFAULT NULL, PRIMARY KEY (`ID_EXAMPLE`) ) ENGINE = MYISAM PARTITION BY HASH(ID_EXAMPLE)( PARTITION p0 DATA DIRECTORY = '/build/5.1/data/partitiontest/p0Data', PARTITION p1 DATA DIRECTORY = '/build/5.1/data/partitiontest/p1Data', PARTITION p2 DATA DIRECTORY = '/build/5.1/data/partitiontest/p2Data', PARTITION p3 DATA DIRECTORY = '/build/5.1/data/partitiontest/p3Data' ); ERROR HY000: Can't create/write to file '/build/5.1/data/partitiontest/p0Data/example#P#p0.MYD' (Errcode: 2)