分区表的全局索引性能是和普通表的索引一样吗？比如对于5000w条数据的表，对非主键单一列建立索引，与同样是此表结构5000w条数据的分区表相同列建立全局索引，性能是否一样？还有局部索引比这前两者更优吗？
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