A) A database can contain multiple undo tablespaces.
B) A database can contain only a single temporary tablespace.
C) A database instance stores undo data In the SYSTEM tablespace If no undo tablespace exists.
D) A database instance hangs If the SYSAUX tablespace becomes unavailable.
E) A database with a locally managed SYSTEM tablespace can have dictionary-managed user tablepaces.
Answer:AE
原文：http://blog.51cto.com/13854012/2148949