【dbdao.com MySQL OCP认证专题】- MySQL 5.6 - OCP 考题讲解 - 75

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【dbdao.com MySQL OCP认证专题】- MySQL 5.6 - OCP 考题讲解

75.

Compare a typical Distributed Replicated Block Device (DRBD) with MySQL Standard Replication using master-slave replication.
Which two statements are correct?

A. Both technologies use the TCP/IP stack as their primary transmission medium.
B. DRBD uses shared-disk technology.
C. Both technologies guarantee an identical copy of data on the secondary node.
D. Only MySQL can maintain a time-delayed copy of data on the secondary node.

答案：A, D
分析：
DRBD是硬件裸设备块的同步，而MySQL Replication是数据上的同步，而非物理存储上的完全一致，因此C错。
DRBD是及时镜像同步，只有MySQL Replication可以进行延时数据同步。
DRBD和MySQL Replication都不使用共享磁盘。

参考：
http://dev.mysql.com/doc/refman/5.7/en/replication-formats.html
http://dev.mysql.com/doc/refman/5.7/en/replication-delayed.html