Clusters formed on the basis of density are very useful and easy to understand and they do not limit to their shapes. Basically two types of density based algorithms are present. One is density based connectivity which focuses on Density and Connectivity and another is Density function which is total mathematical function. They work best in spatial database. In this paper, we are studying DBSCAN, VDBSCAN, DVBSCAN, UDBSCAN, OPTICS, DBNCLUE, GDBSCA and DBCLASD. We analyze some of the algorithms in terms of meaningful clusters.
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