Since this example USES the backup to restore the HDR secondary server, it is only necessary that the chunk files exist and have the proper permissions.
因为这个例子使用备份恢复HDR备用服务器，因此只需要块文件和适当的权限。
In a Comet streaming style application, the client opens a connection and sends a data chunk encoded, with the server sending data chunked encoded in response.
在comet流样式应用程序中，客户端打开连接并发送经过编码的数据块，而服务器也将发送响应中经过编码的数据块。
Chunk writes: Total number of chunk writes (chunk writes, performed as sorted writes, are the most efficient writes available to the database server).
Chunk Writes：区块写的总数(区块写以排序的写操作形式执行，是最高效的数据库服务器写操作)。
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