How is block-change tracking enabled?
A. With alter database enable block change tracking
B. With alter system enable block change tracking
C. With an init.ora parameter change
D. With an spfile parameter change
Block-change tracking must be enabled with alter database enable block change tracking.The physicallocation and name of the block-change tracking file must be supplied.
原文：http://www.cnblogs.com/Babylon/p/7810158.html