drop table if exists t1,t2,t3; # # Test ALTER TABLE to and from s3 # create table t1 (a int, b int) engine=innodb; insert into t1 select seq,seq+10 from seq_1_to_1000; alter table t1 engine=s3; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `b` int(11) DEFAULT NULL ) ENGINE=S3 DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci PAGE_CHECKSUM=1 alter table t1 comment="hello"; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `b` int(11) DEFAULT NULL ) ENGINE=S3 DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci PAGE_CHECKSUM=1 COMMENT='hello' alter table t1 engine=innodb; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL, `b` int(11) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci PAGE_CHECKSUM=1 COMMENT='hello' select count(*), sum(a), sum(b) from t1; count(*) sum(a) sum(b) 1000 500500 510500 drop table t1;