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I would like to know what is different between database clustering and database partitioning? As i know there are two types called attributes or record clustering sometimes called partitioning sometimes called fragmentation (i know partitioning =fragmentation but what is clustering). Is any different between clustering and partitioning in database?. Many thanks to all Ayham
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According to [2] the main difference between clustering and partitioning is that clustering typically implies a bottom-up cell grouping mechanism that generates a large number of small groups (clusters), while partitioning implies a top-down cell grouping mechanism that results in a small number of large groups (parts) ...
DBMS first distributes data into partitions according to boundaries established by the partition ranges. Then, for range-hash partitioning, DBMS uses a hashing algorithm to further divide the data into sub partitions within each range partition.
Partitioning is powerful functionality that allows tables, indexes, and index-organized tables to be subdivided into smaller pieces, enabling these database objects to be managed and accessed at a finer level of granularity.
A clustered table1 stores its rows in the physical order that matches the logical order. To do that, the clustered table has no heap at all, and instead stores its rows in the B-Tree leaves. This can benefit certain kinds of range scans tremendously. For more info, take a look at Use The Index, Luke!
A partitioned table is split to multiple physical disks, so accessing rows from different partitions can be done in parallel.
A table can be clustered or partitioned or both (depending on DBMS).
1Also known as "index-organized table" under Oracle. BTW, Oracle cluster is different thing from Oracle index-organized table.
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In simple words, If you have too much data then you have to partition data on the different machines so searching can become fast and Clustering is the process that sorts data in the partition.
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