If the write operation is to be retried, it must be with the exact same parameters as before.
如果需要重试写操作，它必须使用和前一次完全相同的参数。
In the write-behind case, transactions no longer have to wait for the database write operation to finish.
使用write-behind，不再要求事务等待数据库的写操作完成。
Thus, the read operations compete with log writing and the write operation for data pages from the buffer pool.
因而，读操作与日志写和缓冲池中的数据页的写操作之间存在竞争。
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