输入起始的列地址，开始读操作。
Read Input the starting column address and begin the read operation.
它控制系统对于任何读操作所能预先读取的页数。
It controls how many pages the system reads ahead for any read operation.
该配置的目标是合并系统必须执行的读操作的数量。
The goal is to consolidate the number of read operations that the system must do.
因此，应提供足够的缓冲池空间来支持索引读操作。
Thus, provide sufficient buffer pool space to support index reads.
当存在一个读锁时，很多读操作均可使用这个锁。
When a read lock exists, many read operations may use this lock.
最后两个影响性能的要素是备用服务器上的读操作和内部并行性。
The last two elements that affect performance are reading from secondary server and internal parallelism.
当客户机完成读操作时，它以LAYOUT RETURN表示操作结束。
When the client is finished reading, it expresses the end of the operation with LAYOUTRETURN.
每个成员可以同时访问相同的数据库，包括读和写操作。
Each member can simultaneously access the same database for both read and write operations.
操作必须给出进行读或写的文件中的绝对位置。
Operations must give an absolute position in the file to read to or write from.
在执行操作时，读访问将被允许。
如果多次读或写操作时都遇到无效指针，则内存可能已损坏。
If several read or write operations have occurred through bad Pointers, memory may be corrupted.
该操作是读-修改-写操作。
该操作是读-修改-写操作。
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