Which of the following statements about concurrency controls in a distributed database environment is true? a. Isolation
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Which of the following statements about concurrency controls in a distributed database environment is true?
a. Isolation of transactions is not required to effect two-phase locking
b. In a replicated database, two-phase schedulers may be stored with each version of the data item
c. In a partitioned database, it is easier to enforce concurrency control when there is some overlap of partitions
d. Voting schemes are more likely to be used to resolve concurrency problems in a partitioned database rather than a replicated database
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