# Create 2 UNDO TABLESPACE(UNDO001(space_id =3), UNDO002(space_id =4))
CREATE TABLE t1(a varchar(60)) ENGINE INNODB;
start transaction;
INSERT INTO t1 VALUES(1);
# xtrabackup backup
# Display undo log files from target directory
undo001
undo002
# xtrabackup prepare
# Display undo log files from targer directory
undo001
undo002
DROP TABLE t1;