SET GLOBAL innodb_file_per_table=0; create table bug56947(a int not null) engine = innodb; SET DEBUG='+d,ib_rebuild_cannot_rename'; alter table bug56947 add unique index (a); ERROR HY000: Got error 11 from storage engine SET DEBUG='-d,ib_rebuild_cannot_rename'; check table bug56947; Table Op Msg_type Msg_text test.bug56947 check status OK drop table bug56947; SET @@global.innodb_file_per_table=DEFAULT;