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In this mode, the Shared volume groups are accessible by multiple PowerHA nodes, which results in faster failover (disk takeover) in the event of a node failure.
在这种模式下，多个Power ha节点都可以访问共享卷组，这会加快发生节点故障时的故障转移(磁盘接管)。
A checkpoint refers to a point when the database server synchronizes the pages on disk with the pages in the shared-memory buffers.
检查点是指数据库服务器在特定的时间点对磁盘上的页面和共享内存缓冲区中的页面进行同步。
One purpose of the shared memory area is to act as a buffer, minimizing the necessity for further reads from disk.
共享内存区域的一个作用是充当缓冲区，以减少对磁盘的读操作。
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