Multiple choice technology databases

What information is not included in DBD

  1. access method

  2. segment name

  3. parameter

  4. key field length
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

DBD (Database Descriptor) in IMS defines the physical structure of the database including access method, segment names, and key field lengths. However, 'parameter' as a general concept is not a specific piece of information stored in the DBD itself - parameters are part of application programs, not database descriptors.

AI explanation

A DBD (Database Descriptor) in IMS defines the physical and logical structure of a database: segment names, their hierarchical relationships, key field names and lengths, and the access method (e.g., HDAM, HIDAM, HSAM) used to store/retrieve data. What a DBD does NOT contain is runtime 'parameters' for application programs — those (along with which segments/fields a program can see) are defined in the PSB (Program Specification Block) and its PCBs, not the DBD. So 'parameter' is correctly excluded from DBD content, while access method, segment name, and key field length are all legitimate DBD components.

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