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Select all that are true of database checkpoints. ( Check all that are true. ) a . Database checkpoints are operations in which the DBMS

Select all that are true of database checkpoints. (Check all that are true.)
a.
Database checkpoints are operations in which the DBMS writes all updated ("dirty") block buffers in the RAM block buffer cache to durable storage. This enables recovery of the database state at the time of the checkpoint from disk or other storage.
b.
Checkpoints must be scheduled by an administrator to assure database recoverability.
c.
A checkpoint operation is recorded in the transaction log.
d.
Checkpoints play an important role in transaction recovery.

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