Which two are true about the character sets used in an Oracle database? (Choose two.)
A.Single-byte character sets provide better performance than multibyte character sets. B.Unicode enables information from any language to be stored using a single character set. C.Unicode is the only supported character set for Oracle databases created using Database Configuration Assistant (DBCA). D.Single-byte character sets always use 7-bit encoding schemes. E.Multibyte character sets allow more efficient space utilization than single byte character sets. F.Single-byte character sets always use 8-bit encoding schemes.正确答案AB
