489.For which two database objects can the VERSIONS clause of the Flashback Versions Query be used?(Choose two.)
A.views
B.fixed tables
C.heap tables
D.external tables
E.temporary tables
F.index-organized tables (IOT)
Answer: CF
参考：http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_10002.htm#SQLRF55624
http://docs.oracle.com/cd/E11882_01/appdev.112/e41502/adfns_flashback.htm#ADFNS01
Flashback Version Query allows index-only access only with IOTs (index-organized tables), but index fast full scan is not allowed。
A.views
B.fixed tables
C.heap tables
D.external tables
E.temporary tables
F.index-organized tables (IOT)
Answer: CF
参考：http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_10002.htm#SQLRF55624
http://docs.oracle.com/cd/E11882_01/appdev.112/e41502/adfns_flashback.htm#ADFNS01
Flashback Version Query allows index-only access only with IOTs (index-organized tables), but index fast full scan is not allowed。
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