崩溃恢复及实例恢复能够在实例故障发生后将 数据库 恢复到满足事务一致性（transaction-consistent）的状态。崩溃恢复的定义是：单实例系统发生崩溃或 Oracle RAC 系统中所有实例发生崩溃后对数据库进行的恢复。
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Recovery refers to the actions taken after a system fails to return the database to a transaction-consistent state, which reflects exactly the effects of those transactions that have committed.
恢复用于系统崩溃后把数据库带到事务一致的状态，这将准确的反应已提交的事务。
Transaction style: With this style, master data is consistent, accurate and complete at all times.
事务风格：这种风格可以确保主数据在任何时候都是一致、精确且完整的。
If you assume that one transaction is always a consistent piece of work, it is clear that the system remains consistent if all of its updates are applied.
如果你假设一个事务总是一个一致性的工作单元，整个系统的所有更新都被执行，很显然系统仍能够保持一致性。
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