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ESDS clusters should be compressed only under certain processing conditions. After a record is written in an ESDS, the ESDS is not allowed to change size and VSAM record management fails any request to do so. Changing compressed data in an existing record commonly changes its length, so any data in the record that could be updated must be defined as noncompressible. Good candidates for compression are ESDSs that are read-only or those where data are added only to the end of the data set.
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