【多选题】
A If 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 tohelp detect physical or media corruption.
C A media corrupt block is one where the block is not formatted correctly.
D The ANALYZE TABLE <table name> VALIDATE STRUCTURE CASCADE command verifiesthat each table row has an index entry pointing to it.
E If a row lock is held by a nonexistent transaction, the block containing therow is logically corrupt.
F DB LOST WRITE PROTECT-TYPICAL causes extra logging overhead on the standbydatabase.
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