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IDMS Interview Questions & Answers - Learning Mode

IDMS Interview Questions & Answers - Learning Mode

IDMS (Integrated Database Management System) is primarily a network (CODASYL) database management system for mainframes. It was first developed at B.F. Goodrich and later marketed by Cullinane Database Systems (renamed Cullinet in 1983). It is primarily a network database management system. IDMS/R (Integrated Database Management System/Relational) is a software product on IBM mainframe that offers capabilities for working with well-organized data. IDMS/R is one of a number of software systems that can be classified as a DBMS.

Try IDMS Interview Questions & Answers - Exam Mode

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IDMS Interview Questions & Answers - Learning Mode
Try IDMS Interview Questions & Answers - Exam Mode
Question: What is the difference between a schema and a subschema?

Answer: The schema is the physical arrangement of the data as it appears in the DBMS. The subschema is the logical view of the data as it appears to the application program. Source:
Question: What is the meaning of 'Copy IDMS Subschema-Binds'?

Answer: It generates a bind run-unit and binds all the records for the sub-schema the program is referencing. Source:
Question: Why would you use find and get rather than an obtain?

Answer: Find tells you whether the record is actually in the database. If it is not found you save the overhead of an obtain. Source:
Question: What is a set?What pointers are required, what are possible? How may sets be ordered?

Answer: A set is an owner record and, optionally, its member records. There are three types of pointers: next, prior and owner, but only next is required. There are five possible orders for arrangements of sets; they are: first - insert at beginning, last - insert at end of set, next - insert after current of set, prior - insert prior to current of set and sorted - insert according to sort value. Source:
Question: If the stored record is not defined as automatic of a set, how can it be stored as a member of the set?

Answer: Store the record then connect it to each set where it is a manual member. Source:
Question: What does a FINISH do?

Answer: It releases all database resources, terminates database processes, writes statistical information to IDMS and logs the checkpoint. Source:
Question: How does IDMS insure data integrity?

Answer: IDMS uses record locks to prevent another run-unit from updating the same record. Source:
Question: What is the purpose of a READY?

The READY prepares a database area for access by DML functions. Source:
Question: So manual and automatic are the connect options for a set. What are the disconnect options?

Answer: Mandatory and optional. Source:
Question: If you are current on the owner of a set, what is the difference between an obtain next and obtain first?

Answer: No difference. There is a difference between obtain first and obtain next for an area sweep, but not when current on the owner in a set. Source:
Question: What is DB-Key?

Answer: No answer available currently.
Question: What is a bind?

Answer: A bind associates record types with the program work area; for run unit and records it is the first command issued in the program. Source:
Question: What is a page?


A page is the smallest unit of storage in an IDMS database Source:
Question: Explain the difference between record occurrence and record type?

Answer: A record occurrence is the instances of a record; it is the smallest addressable unit of data. A type is the description of a record; there needn't be any occurrences. Source:
Question: Distinguish among erase, erase permanent, erase selective and erase all?

Answer: Erase cancels the membership of a record in specific set occurrences and removes only the named record.
Erase permanent removes the specific record and all mandatory occurrences it owns. It disconnects all optional members.
Erase selective removes the record, all mandatory members and all optional members not connected to other sets. It disconnects those that are connected.
Erase all removes the specified record and all the mandatory and optional records it owns.
Question: What is the meaning of the return codes 0307 and 0326?

Answer: 0307 is end-of-set and 0326 is record not found. Source:
Question: What does a ROLLBACK do?

Answer: It rolls back (reverses) all database updates to the point of the last rollback or to the beginning of the run-unit. Source:
Question: What does a status return code of nn29 mean in relation to record locks?

Answer: nn29 means that two run units are waiting to set locks on the same record and are in deadlock. Source:
Question: What sets will the stored record connect to?

Answer: It will connect to all sets where it is defined as an automatic member. The store requires that currency be established for all these set occurrences. Source:
Question: What does a COMMIT statement do?

Answer: It writes a checkpoint to the Journal File and releases any record locks. Source:

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