Hierarchical Interview Questions and Answers

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Database Hierarchical guideline for job interview preparation. Explore list of Hierarchical frequently asked questions(FAQs) asked in number of Database Hierarchical interviews. Post your comments as your suggestions, questions and answers on any Hierarchical Interview Question or answer. Ask Hierarchical Question, your question will be answered by our fellow friends.

  1. Hierarchical questions updated at 12 May 11 in Category Databases Programming and visited 623 Times

Hierarchical Questions and Answers:

1 :: Explain the main control blocks available in IMS DB?

There are three control blocks (also known as DL/I control blocks)

► Database Description (DBD)
► Program Specification Block (PSB)
► Application Control Block (ACB)
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2 :: Explain the advantages and disadvantages of a Hierarchical Database?

Advantages:
► Speed of access is faster because of the predefined data paths.

Disadvantages:
► Complex implementation
► Predefined tree structure reduces flexibility.
► Difficult to manage
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3 :: Explain atomicity and aggregation?

Atomicity:
Either all actions are carried out or none are. Users should not have to worry about the effect of incomplete transactions. DBMS ensures this by undoing the actions of incomplete transactions.
Aggregation:
A concept which is used to model a relationship between a collection of entities and relationships. It is used when we need to express a relationship among relationships.
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4 :: Explain Phantom Deadlock?

In distributed deadlock detection, the delay in propagating local information might cause the deadlock detection algorithms to identify deadlocks that do not really exist. Such situations are called phantom deadlocks and they lead to unnecessary aborts.
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5 :: What is IMS Software Environment?

IMS Software Environment consists of the below five main components:

► IMS DB
► DL/I
► DL/I Control Blocks
► IMS DC
► Application Programs
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