OMCA104 DATABASE MANAGEMENT SYSTEM

Description

SESSION SPRING 2024

PROGRAM MASTER OF COMPUTER APPLICATION SEMESTER I

COURSE CODE & NAME OMCA104, DATABASE MANAGEMENT SYSTEM

CREDITS 4

 

 

Assignment Set – 1^ST

Questions

 

1. Briefly describe network database model. Also explain the difference between network database and hierarchical database.

Ans: A network database model is a database model conceived as a flexible way of representing objects and their relationships. It is a type of database model wherein multiple records can be linked to multiple parent and child records, allowing for more complex and many-to-many relationships among data elements. The network model uses a graph structure, with nodes representing entities and

 

Its Half solved only

Buy Complete from our online store

 

https://smuassignment.in/online-store/

 

SMU Fully solved assignment available for session Spring 2024.

 

Lowest price guarantee with quality.

Charges INR 198 only per assignment. For more information you can get via mail or Whats app also

Mail id is aapkieducation@gmail.com

 

Our website www.smuassignment.in

After mail, we will reply you instant or maximum

1 hour.

Otherwise you can also contact on our

whatsapp no 8791490301.

 

 

 

2. What are the three basic components of a select statement? Explain with an example.

Ans: A SELECT statement in SQL is used to query data from a database.

The three basic components of a SELECT statement are: 

SELECT clause: Specifies the columns to be retrieved.

FROM clause: Specifies the table(s) from which to retrieve the data.

WHERE clause (optional): Specifies the conditions for filtering the data.

Example: Suppose we have a

 

3. A. Explain the various heuristics involved in query optimisation.

Ans: Query optimization is a critical aspect of database management systems (DBMS) aimed at improving the efficiency of query execution. Various heuristics are used in query optimization to achieve this goal.

Here are some of the key heuristics: 

1. Selection Pushdown:

 

 

 

1. Describe multi-query optimisation and its application.

Ans: Multi-query optimization (MQO) is an advanced technique used in database management systems (DBMS) to optimize the execution of multiple queries simultaneously. Instead of optimizing each query individually, MQO aims to find commonalities among queries and exploit them to reduce the overall execution cost. This can involve reusing intermediate results,

 

 

Assignment Set – 2^ND

Questions

 

4. A. Explain the physical query plan operators.

Ans:

In database management systems, a physical query plan represents the specific operations that will be executed to retrieve and manipulate data as specified by a SQL query. These operations are called physical query plan operators. Each operator corresponds to a specific action performed on the data, such as scanning a table, joining tables, or sorting data.

Here are some of the common

 

5. Explain the eddy architecture and how it allows for extreme flexibility.

Ans: The Eddy architecture is an innovative approach in query processing designed to provide extreme flexibility and adaptability in how queries are executed. This architecture dynamically routes tuples (data rows) through various operators based on runtime conditions, such as the current

 

 

6. Explain the concept of database recovery management. Discuss the different levels of backup used for recovering data.

Ans:

Database recovery management is a crucial aspect of database management systems (DBMS) that ensures data integrity, consistency, and availability in case of system failures, crashes, or other unexpected events. It involves the processes and mechanisms to restore a database to a correct state after a failure. The primary goal of recovery management is to protect data from loss and maintain the