This means that while multiple processes and threads can read from the same database at the same time, only one is able to write.
这意味着当多个进程和线程可以在同一时间从同一数据库读取数据，但只有一个可以写入数据。
This may be especially effective when the database is or is largely read-only.
如果数据库是只读的，或者基本上是只读的，那么这就特别有效。
The reason why the asynchronous read ratio is so small is because the table Spaces in the database are set up with only one container each so that prefetching cannot take place.
异步读取比率如此小的原因是因为数据库中的表空间每个仅仅设置了一个容器，以致无法进行预取。
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