单选题

Choose the best answer.
Four nodes are configured to use circular replication. Examine these configuration parameters for each each node:
Slave_parallel_type=DATABASE ; slave_parallel_workers=4 slave_preserve_commit_order=0
Which statement is true?

AEach slave thread is responsible for updating a specific database.

BCross-database constraints can cause database inconsistency.

CSetting slave_parallel_type=DATABASE won‘t work for circular replication; it should be set to
LOGICAL_CLOCK.

DIncreasing slave_parallel_workers will improve high availability.

ESetting slave_preserve_commit_order to ON will improve data consistency.

FSetting transaction_allow_batching to ON will improve data consistency.

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正确答案：A （备注：此答案有误）

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