Oracle Interview Question Software Engineer / Developers
0of 0 voteswhat is cluster in dbms?
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what is cluster in dbms?
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When multiple databases and multiple tables are joined, it's referred to as a cluster. The records for the tables sharing the value of a cluster key shall be stored together in the same or nearby data blocks. This may improve the joins of these tables on the cluster key, since the matching records are stored together and less I/O is required to locate them.[2] The data layout in the tables which are parts of the cluster is defined by the cluster configuration. A cluster can be keyed with a B-Tree index or a hash table. The data block in which the table record will be stored is defined by the value of the cluster key.
- Hunter@1409 August 10, 2012