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。
This is consistent with batching all database operations until the end of the transaction, which is also the WebLogic default.
这与在事务结束时才批处理所有数据库操作是一致的，它也是WebLogic的缺省做法。
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