摘要
给出了一种两步锁的扩充，称为利它锁，即让长事务较早地释放其占用的锁，使需要存取这些被锁数据的事务在长事务处于唤醒状态时，遵循一定的锁规则同时运行。
Proposes an extension to two - phase locking, called altruistic locking. It can release their locks early and the transactions that access thess released data can run in the wake of the long - lived transactions following special locking rules.
关键词
并发控制
可串行性
事务管理
数据库系统
transaction
concurrency control
two-phase locking
serializability
