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What is the difference between an HDAM and HIDAM IMS database?

April 26, 2017database difference IMS

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What is the difference between an HDAM and HIDAM IMS database?

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A HIDAM database uses a separate index file based on the keyfield of the root segment. This file contains the pointer information that points to the data record. An HDAM file has no separate index file, however, the key field for each record is put thru a randomizer which puts the record to a specific location in the database.