数据库系统性能受到查询执行的严重影响。然而SQL语句的执行计划可能因统计信息变化，优化参数变化或方案定义变化等原因而意外改变，Oracle Optimizer优化器往往无法在没有人工干预的情况下准确进化执行计划。在无法保证新的执行计划总是趋于变得更好的情况下，用户倾向于通过存储大纲(stored outline)或锁定统计信息来保证执行计划的问题。然而使用这些方式将不可避免地丧失利用到新的优化器....

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