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In RMAN， when the RESYNC CATALOG command is issued， in which two situations does the command file actually perform synchronization？（）
A:After the COPY command.
B:After adding a data file in the target database.
C:After adding a tablespace in the target database.
D:After adding a tablespace in the catalog database.
E:After dropping a data file in the catalog database.
F:After running SQL Loader to load a large amount of data.

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出自：Oracle认证

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