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You are maintaining the PROD database of TeleSoft Corporation. You have initialized the following DB_BLOCK_CHECKING parameter in the init.ora file：  DB_BLOCK_CHECKING = TRUE；  What will be the result of setting this parameter？（）
A: Only data blocks of the SYSTEM tablespace will be checked.
B: Only data blocks of the SYSAUX tablespace will be checked.
C: A checksum will occur only on the checkpoint.
D: A checksum will occur every time a block is modified.

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出自：Oracle认证

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