Choose three. Which three are true about corrupted data blocks and
Their recovery in an Oracle Database?
A.正确答案DEFIf a row lock is held by a nonexistent transaction, the block containing the row
Is media corrupt.
B.DB_BLOCK_CHECKING=TRUE causes a check sum to be added to each data
Block to help detect physical or media corruption.
C.A media corrupt block is one where the block is not formatted correctly.
D.The ANALYZE TABLE VALIDATE STRUCTURE CASCADE command verifies that
Each table row has an index entry pointing to it.
E.If a row lock is held by a nonexistent transaction, the block containing the row
Is logically corrupt. F.DB_LOST_WRITE_PROTECT=TYPICAL causes extra logging overhead on the
Standby database.
