Read committed, Read uncommitted, Repeatable Read, Serializable.

提交读，未提交读，可重复读，可串行读。

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Mobile update transactions and mobile read only transactions are supported by a pseudo serializable concurrency control protocol that supports both updates and read-only transactions from clients.

为在广播环境中同时有效支持移动更新事务和移动只读事务，提出一种可在移动客户端同时支持更新事务和只读事务的伪可串行化实时并发控制协议。

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