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Key Compression z/OS DFSMS Using Data Sets SC23-6855-00 |
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The key in an index entry is stored by VSAM in a compressed form. Compressing the key eliminates from the front and back of a key those bytes that are not necessary to distinguish it from the adjacent keys. Compression helps achieve a smaller index by reducing the size of keys in index entries. VSAM automatically does key compression in any key-sequenced data set. It is independent of whether the data set is in compressed format. |
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