显然，对所有数据编索引不仅对于读而且对于写都很耗时。
Indexing all that data is obviously expensive for reads, but also for writes.
如果你的数据是又读又写的，那么使用“read-write”策略。
buf_read _ callback：当客户端套接字有要读的数据时调用它。
Buf_read_callback : Called when the client socket has data to be read.
然后，您就可以写入必要的数据，并为数据提供不错的读性能。
You can then write the necessary data and provide bounded Read performance over the data.
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.
具体地说，这里讨论连接、读、写和释放连接等数据库函数。
In particular, database functions such as connect, read, write, and release connection are covered here.
会发生不可重读、幻像读和读未提交数据。
An unrepeatable read, phantom read, and reads of uncommitted data can occur.
当遇到日志写满情况，仍允许对数据库的读访问。
When a log full condition is encountered, read access is still allowed on the database.
该用户id必须拥有读元数据的权限。
Readcommitted（读已提交） ——事务可以读取由另一事务提交的数据。
Read committed -- The transaction can read data committed by other transactions.
随着服务运行在read_committed，我认为它不会等待记录，但只会读旧数据并继续(这很好)。
With the service running at READ_COMMITTED, I thought it would not wait for the record, but would just read the old data and continue (which is fine).
这些链接会读“数据录入”，“经理人”等，以及链接可能是密码保护。
The links would read "Data Entry", "Manager", etc. and the links could be password protected. I. e.
你能够读那些商业数据。
你能够读那些商业数据。
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