以数据分割为中心进行探讨对数据进行分割，可缩小待访问数据对象的范围或磁盘空间，提高检索性能，把分割后的数据放到不同的磁盘上，提高数据库并行访问的能力-To split the data into the data center to explore split, the data object to be accessed can be reduced scope or disk space to improve the retri　performance, the data is divided into different disk, improve the ability of concurrent　access