【多选题】
A DB BLOCK CHECKING=TRUE causes a check sum to be added to each data blockto help detect physical or media corruption.
B DB LOST_WRITE PROTECT=TYPICAL causes extra logging overhead on thestandby database.
C lf a row lock is held by a nonexistent transaction, the block containing the row is mediacorrupt.
D The ANALYZE TABLE<tabble name> VALIDATE STRUCTURE CASCADE commandverifies that each table row has an index entry pointing to it.
E lf a row lock is held by a nonexistent transaction, the block containing the row islogically corrupt.
F A media corrupt block is one where the block is not formatted correctly.
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