Deferred global view maintenance can speed up the update transactions by shifting maintenance into a deferred transaction , but even strict two phase locking ( 2pl ) can not guarantee the serializable execution of transactions in this case . this paper develops a serializabitity theory base upon conflicts and serialization graphs in presence of deferred global view maintenance 由于延迟视图维护机制允许修改事务在全局视图没有进行相应的改动之前提交,有暂时的数据不一致情况出现,在这种情况下,即使严格的zpl协议也不能保证全局事务的可串行化执行。