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3. Repair the database log regeneration. This command checks the allocation, structure, logical integrity and object errors in all databases.Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From Encyclopedia冲进去之后。元朝末年，天下大乱，群雄逐鹿，民不聊生。龙典寺小和尚朱元璋揭竿起事，率兵攻入南京应天府。后得知民间有“三分天下诸葛亮，一统江山刘伯温”的说法后，亲临文成南田请出了隐居乡间的刘伯温。沧海横流，方显英雄本色。刘伯温出山后。以“帝师”、“王佐”的身份，为朱元璋定了西平陈友谅，东征灭张士诚而后一统大业的战略。一统江山后，刘伯温辅助朱元璋开始了政治改革。应付自如，指点江山，笑傲群雄，最后引身而退，奸相胡惟庸仍不放过退隐山林的刘伯温，几次阴谋加害。刘伯温之死成为千古迷案，云遮雾隐。小葱看着院中鹅毛似的大雪，纷纷扬扬赶场似的往下落，树梢上、对面屋顶上、地面上，已经是厚厚一层，那景象十分壮观。可只要一从郑家出来，就又觉得心里空空的，想立即回头找他，因怕人笑话，才强忍着，回去后又惦记。　　但百密总有一疏，在总是被欺负忽略的五弟馀一在第七次为了反抗不平等待遇的离家出走的过程中，桃花遇见了一个男孩，一个唯一拥有通过四个哥哥所详列的超完美条件，并找不到任何反对理由的超完美男孩……