IMS DL/I Function Codes

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The DL/I function codes may broadly be classified into 3 types. They are,

1. RETRIEVAL CODES

   • GU GET UNIQUE

   • GN GET NEXT

   • GNP GET NEXT WITHIN PARENT

2. UPDATION CODES

   • ISRT INSERT

   • DLET DELETE

   • REPL REPLACE

3. GET-HOLD CODES

   • GHU GET-HOLD UNIQUE

   • GHN GET-HOLD NEXT

   • GHNP GET-HOLD NEXT WITHIN PARENT

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Retrieval of Information:

Retrieval of information from an IMS database can be done in two ways.

1. Random Retrieval

   GU & GHU function codes are used

2. Sequential Retrieval

   GN, GNP, GHN AND GHNP function codes are used

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