053-400

Which of the following methods can be used to detect block corruption?
A. ANALYZE operations
B. dbv
C. SQL queries that access the potentially corrupt block
D. RMAN
E. All of the above

　　Option A is correct because if you attempt to analyze a table or index that has a corrupt block,the ANALYZE command will indicate it .Option B is correct because the dbv command(DBVERIFY utility) is used to verify the data-structure integrity of an offline datafile.DBVERIFY will let you know if the datafile fails the integrity check.Option C is correct unless you have used DBMS_REPAIR.SKIP_CORRUPT_BLOCKS to permit queries to skip corrupt blocks.D is correct because the RMAN BACKUP command will detect corruption by default.