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Hierarchical Database Model Interview Questions & Answers - Learning Mode
COOLINTERVIEW.COM DATABASE INTERVIEW QUESTIONS HIERARCHICAL DATABASE MODEL INTERVIEW QUESTIONS QUESTIONS & ANSWERS - LEARNING MODE

Hierarchical Database Model Interview Questions & Answers - Learning Mode

A hierarchical database model is a data model in which the data is organized into a tree-like structure. The data is stored as records which are connected to one another through links. A record is a collection of fields, with each field containing only one value. A hierarchical database is a design that uses a one-to-many relationship for data elements. Hierarchical database models use a tree structure that links a number of disparate elements to one "owner," or "parent," primary record.

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Hierarchical Database Model Interview Questions & Answers - Learning Mode
Try Hierarchical Database Model Interview Questions & Answers - Exam Mode
Question: What is DBD?

Answer: DBD (Database Definition) is used to define the physical structure of the database.

► One DBD for each database
► Created by a series of control statements - by a process called DBDGEN
► Used by DL/I whenever database is used
Source: CoolInterview.com
Question: What are the advantages and disadvantages of a Hierarchical Database?

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

Disadvantages:
► Complex implementation
► Predefined tree structure reduces flexibility.
► Difficult to manage
Source: CoolInterview.com
Question: What is a Phantom Deadlock?

Answer: 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.
Source: CoolInterview.com
Question: What is PSB?

Answer: Program Specification Block defines the programs view of the database and application programs access authority to database. It defines the logical data structure. A PSB is made up of one or more PCBs (Program communication blocks).
Source: CoolInterview.com
Question: What is heirarchical database?

Answer: A hierarchical data base is a data model in which the data is organized into a tree-like structure. The structure allows repeating information using parent/child relationships: each parent can have many children but each child only has one parent Source: CoolInterview.com
Question: Explain IMS Software Environment?

Answer: IMS Software Environment consists of the below five main components:
► IMS DB
► DL/I
► DL/I Control Blocks
► IMS DC
► Application Programs Source: CoolInterview.com
Question: What do you mean by atomicity and aggregation?

Answer: 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.
Source: CoolInterview.com
Question: What are the advantages and disadvantages of a Hierarchical Database?


Answer: Advantages: Speed of access is faster because of the predefined data paths.
Disadvantages: ? Complex implementation ? Predefined tree structure reduces flexibility. ? Difficult to manage Source: CoolInterview.com
Question: What do you mean by Hierarchical Database?


Answer: ? Follows inverted tree structure
? Data relationship is predefined by it's structure
? Program accesses the data through predefined paths.
Source: CoolInterview.com
Question: What is a checkpoint and When does it occur?

Answer: A Checkpoint is like a snapshot of the DBMS state. By taking checkpoints, the DBMS can reduce the amount of work to be done during restart in the event of subsequent crashes. Source: CoolInterview.com
Question: What is DL/I?

Answer: DL/I is a command-level language to manipulate IMS databases. DL/I forms a bridge between application program and IMS database. It is used in batch and online programs to access data stored in IMS databases.

Every access to an IMS database is through DL/I. The DL/I interface must be called to update or read a IMS database. DL/I allows both sequential and random processing of a database. Source: CoolInterview.com
Question: What are the main control blocks available in IMS DB?

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

► Database Description (DBD)
► Program Specification Block (PSB)
► Application Control Block (ACB)
Source: CoolInterview.com

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