write while read 边写边读
Read-While-Write 在写的同时可以读 ; 写的同时可以读 ; 同时可以读
Read While Write 写的同时读 ; 写同时读
RWW Read While Write 边读边写功能
no read-while-write 非同时读写区
The primary server has write access to a disk or disk array, while all SDS servers have read-only access.
主服务器拥有对一个磁盘或磁盘阵列的写访问权，而所有 SDS 服务器则仅拥有只读访问权。
Because driver maintains connection to both nodes while write transactions are directed to the primary node, read transactions can be directed to either node.
由于驱动程序维护与两个节点的连接，同时写事务被定向到主节点，因此读事务可以定向到任何一个节点。
It allows applications to perform constant data load operations to a table in the background while the interactive read and write operations can occur concurrently.
它允许应用程序在后台对表执行恒定数据加载操作，同时可以执行交互式读取和写入操作。
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