MCQ on DBMS ( Database Management System MCQ )
In this article, we will discuss the most important MCQ on DBMS to acquaint you with the type of questions asked on Database Management systems (DBMS). Here below we provide a list of Important MCQ on DBMS outlined by our experts who suggest the most important concepts of Database Management System MCQ for various competitive exams. The MCQ on DBMS listed below ranges from the basic to the most advanced MCQ in simple words with examples for your simple understanding.
A database management system (DataBase Management System, DBMS) is essentially a management system designed to manage data in a database. Relying on the database, it provides functions and interfaces for the unified management of data in the database, and can effectively manage the security, authentication, data backup, data recovery, and data transmission of the database in a unified manner. At the same time, the database management system can classify the database according to the database model it relies on. Most databases manage and maintain the data in the database through a database management system.
Our DBMS MCQ Question adds value to your exam preparation plan and completely transforms your revision process. Practicing the MCQ on DBMS online test will not only help you analyze the examination pattern, question types, and marking scheme but also enhance your time management skills. It is again an important component from the exam point of view. This article will help you find the vital Introduction to DBMS MCQ Pdf.
Important Points to Remember about DBMS
- DBMS commonly known as Database Management System is an application system whose main purpose revolves around data. It is a system that allows its users to store data, define it, retrieve it, and update information about the data inside the database.
- The database management system is one of the most important system software in the field of computer science and technology, and it is also an indispensable basic platform for various information systems. Its main tasks are to collect, classify, organize, process, store, analyze, and provide common technical support for the entire life cycle of the application.
- Charles Bachman along with his team invented the first DBMS known as Integrated Data Store (IDS).
- Simply a database is a collection of data in some organized way to facilitate its user’s easy access, management, and uploading of data.
- The reason for creating the database management system was to store large data and these data can be of any form image, text, audio, video files, etc. DBMS allows users to store and access the data in any format.
- DBMS has 3 types of languages as mentioned below: DDL: DDL is the data definition language used to define database and schema structure using certain sets of SQL Queries Create, age, truncate, drop and RENAME.
- DCL: DCL is a data control language used to control user’s access to a database, such as grants and withdrawals using certain sets of SQL Queries.
- DML: DML is a language manipulation language that is used to manipulate a database, including select, insert, delete, and update using certain sets of SQL queries such as entry, deletion, etc.
- RDBMS is a relational database management system that contains data in the form of tables and the data is accessed based on common fields between tables.
- The essence of the database management system is that the user hopes to use the “computing + storage” capability provided by the database management system to obtain the calculation result by performing user-specified analysis and calculation on the data in the storage through the computing power of the computing node, and finally, realize the application of the data.
MCQ on DBMS ( Database Management System MCQ )
1. A database is an organized collection of_______________
(a) data
(b) Attributes
(c) Record
(d) None of the above
Answer: (a) data
Explanation: A database is an organized collection of related data, which can be easily accessed, updated, and managed efficiently.
2. A database management system (DBMS) is a________
(a) Hardware system used to create, maintain and provide controlled access to a database
(b) Hardware system used to create, maintain and provide uncontrolled access to a database
(c) Software systems used to create, maintain, and provide uncontrolled access to a database
(d) Software systems used to create, maintain, and provide controlled access to a database
Answer: (d) Software systems used to create, maintain, and provide controlled access to a database
Explanation: DBMS is a software suite that allows users to define, create, maintain, and control access to the database securely.
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3. Database management system (DBMS) is a___________
(a) DBMS is a collection of queries
(b) DBMS is a high-level language
(c) DBMS is a programming language
(d) DBMS stores, modifies and retrieves data
(e) None of the above
Answer: (d) DBMS stores, modifies and retrieves data
Explanation: DBMS provides tools for efficiently handling large amounts of data including its storage, modification, and retrieval.
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4. A Database Management System (DBMS) is_____________
(a) collection of data describing one particular enterprise
(b) collection of programs to access data
(c) collection of interrelated data
(d) All of the above
Answer: (d) All of the above
Explanation: DBMS is a combination of interrelated data and software tools to manipulate and retrieve this data as needed.
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5. What is the full form of DBMS?
(a) Data of Binary Management System
(b) Database Management System
(c) Database Management Service
(d) Data Backup Management System
Answer: (b) Database Management System
Explanation: DBMS stands for Database Management System — a suite of programs to manage databases efficiently.
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6. Which of the following is not a database program?
(a) MySQL
(b) Oracle
(c) Writer
(d) Base
Answer: (c) Writer
Explanation: Writer is a word processing software (part of LibreOffice), not a database management system.
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7. What is DBMS?
(a) DBMS is a collection of queries
(b) DBMS is a high-level language
(c) DBMS is a programming language
(d) DBMS stores, modifies and retrieves data
Answer: (d) DBMS stores, modifies and retrieves data
Explanation: DBMS performs functions such as storing data, modifying existing records, and retrieving data efficiently.
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8. Which of the following is not the advantage of the database?
(a) Sharing of Data
(b) Reduce Data Redundancy
(c) Increase Data Inconsistency
(d) Data Security
Answer: (c) Increase Data Inconsistency
Explanation: A good DBMS reduces data inconsistency, not increases it. That is one of its main advantages.
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9. Who created the first DBMS?
(a) Edgar Frank Codd
(b) Charles Bachman
(c) Charles Babbage
(d) Sharon B. Codd
Answer: (b) Charles Bachman
Explanation: Charles Bachman developed the first DBMS, known as the Integrated Data Store (IDS), in the 1960s.
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10. When data is stored, maintained, and retrieved from multiple tables then special database software is required called______
(a) DBMS
(b) RDBMS
(c) Special DBMS
(d) All of the above
Answer: (b) RDBMS
Explanation: Relational Database Management System (RDBMS) is required when managing data from multiple related tables.
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11. Which type of data can be stored in the database?
(a) Image-oriented data
(b) Text, files containing data
(c) Data in the form of audio or video
(d) All of the above
Answer: (d) All of the above
Explanation: Modern DBMSs can store diverse data types including text, images, audio, video, and multimedia formats.
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12. SQL stands for_________________
(a) Structured Queue Language
(b) Structured Query Language
(c) Structured Query Lang
(d) None of the above
Answer: (b) Structured Query Language
Explanation: SQL (Structured Query Language) is used to communicate with and manipulate relational databases.
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13. In which of the following formats data is stored in the database management system?
(a) Image
(b) Text
(c) Table
(d) Graph
Answer: (c) Table
Explanation: Data in a DBMS is organized in a tabular form (rows and columns), which makes retrieval and manipulation efficient.
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14. _______________ are the basic building blocks of a database.
(a) Tables
(b) Record
(c) Fields
(d) All of the above
Answer: (a) Tables
Explanation: Tables are the primary structural units in a relational database that store data in rows and columns.
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15. Which of the following is not a type of database?
(a) Hierarchical
(b) Network
(c) Distributed
(d) Decentralized
Answer: (d) Decentralized
Explanation: Decentralized is not a formal database model. The main types are hierarchical, network, relational, and distributed.
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16. A DBMS that combines a DBMS and an application generator is ____
(a) Oracle Corporation’s Oracle
(b) Microsoft’s SQL Server
(c) Microsoft’s Access
(d) None of these
Answer: (c) Microsoft’s Access
Explanation: Microsoft Access integrates both DBMS functionalities and tools for application development, allowing users to build forms and reports along with managing data.
17. __________ are used to identify which type of data we are going to store in the database.
(a) Datatype
(b) Record
(c) Table
(d) Attributes
Answer: (a) Datatype
Explanation: Data types define the kind of data a column can hold — such as integers, strings, dates, etc.
18. DBMS helps to achieve_________
(a) Data independence
(b) More redundancy
(c) Centralized manner to control data
(d) Both a and c
Answer: (d) Both a and c
Explanation: DBMS provides centralized control of data and promotes data independence by separating the data structure from the application.
19. Which of the following is not an example of DBMS?
(a) MySQL
(b) Microsoft Access
(c) IBM DB2
(d) Google
Answer: (d) Google
Explanation: Google is a search engine, not a DBMS. MySQL, Access, and DB2 are all examples of database management systems.
20. Which of the following is/are the primary features of a DBMS?
(a) To provide an environment that is congenial to the user
(b) To store the information
(c) To retrieve information
(d) All of the above
Answer: (d) All of the above
Explanation: DBMS is designed to store, retrieve, and manage data efficiently in a user-friendly environment.
21. Which of the following is a feature of DBMS?
(a) Minimum Duplication and Redundancy of Data
(b) High Level of Security
(c) Single-user Access only
(d) Support ACID Property
Answer: (c) Single-user Access only
Explanation: This is a false feature. DBMS generally supports multi-user access. Hence, this option is not a feature of DBMS.
22. A database management system____________
(a) Allows simultaneous access to multiple files
(b) Can do more than a record management system
(c) Is a collection of programs for managing data in a single file
(d) Both a and b
Answer: (d) Both a and b
Explanation: DBMS provides multi-user access and performs complex tasks beyond just record keeping, such as query processing, indexing, and transactions.
23. Which data type will be appropriate to store information such as Salary, Fees, Price, etc?
(a) Alphanumeric Data types
(b) Numeric Data type
(c) Binary Data types
(d) Date Time
Answer: (b) Numeric Data type
Explanation: Numeric data types are specifically designed to store numbers like salaries, fees, and other numerical values.
24. External database is_________
(a) Database created using DBMS package
(b) Database created in MS-Word
(c) Database created in EXCEL
(d) All of the above
Answer: (a) Database created using DBMS package
Explanation: An external database refers to one that is created and maintained through standard DBMS tools like Oracle, MySQL, or Access.
25. Which of the following is a function of the DBMS?
(a) Storing data
(b) Providing multi-user access control
(c) Data Integrity
(d) All of the above
Answer: (d) All of the above
Explanation: DBMS provides functionalities such as storing data, controlling access for multiple users, and maintaining data integrity.
26. The method of file organization in which data records in a file are arranged in a specified order according to a key field is known as the
(a) Sequential access method
(b) Queuing method
(c) Predetermined method
(d) Direct access method
Answer: (a) Sequential access method
Explanation: In sequential access, records are arranged in a pre-defined order based on a key, enabling efficient sequential searching.
27. _______ data types are used for storing photos, music files, etc
(a) Binary
(b) Alphanumeric
(c) Numeric
(d) Special
Answer: (a) Binary
Explanation: Binary data types (like BLOBs) are used to store non-textual data such as images, audio, and video.
28. A logical schema_____________
(a) Is the entire database.
(b) describe data in terms of relational tables and columns, object-oriented classes, and XML tags.
(c) Describes how data is stored on disk.
(d) Both (A) and (C)
Answer: (b) describe data in terms of relational tables and columns, object-oriented classes, and XML tags.
Explanation: Logical schema defines the logical structure of the database — how data is logically stored and organized.
29. SET concept is used in_____________
(a) Network Model
(b) Hierarchical Model
(c) Relational Model
(d) None of these
Answer: (a) Network Model
Explanation: The network model uses the concept of SETs to define the relationships between entities.
30. An advantage of the database management approach is___________
(a) Data is dependent on programs.
(b) Data redundancy increases.
(c) Data is integrated and can be accessed by multiple programs.
(d) None of the above
Answer: (c) Data is integrated and can be accessed by multiple programs.
Explanation: A DBMS centralizes data, allowing multiple programs to access a shared, consistent data source.
31. The database environment has all of the following components except:
(a) Users.
(b) Separate files
(c) Database.
(d) Database administrator
Answer: (b) Separate files
Explanation: A modern DBMS centralizes data into one integrated system, not separate files. The environment includes users, data, and administrators.
32. DBMS helps to achieve____________
(a) Data independence.
(b) Centralized control of data.
(c) Control redundancy.
(d) All of the above.
Answer: (d) All of the above
Explanation: DBMS reduces redundancy, controls data centrally, and separates data from programs to ensure independence.
33. Conceptual design____________
(a) Is a documentation technique.
(b) Needs data volume and processing frequencies to determine the size of the database.
(c) Involves modeling independent of the DBMS
(d) Is designing the relational model.
Answer: (c) Involves modeling independent of the DBMS
Explanation: Conceptual design is the abstract representation of the database structure, independent of any specific DBMS.
34. A DBMS query language is designed to___________
(a) Support end users who use English-like commands
(b) Support in the development of complex applications software.
(c) Specify the structure of a database.
(d) All of the above.
Answer: (d) All of the above
Explanation: DBMS query languages like SQL help define, manipulate, and query data in a user-friendly and programmable manner.
35. The property/properties of a database is/are:
(a) It is an integrated collection of logically related records.
(b) It consolidates separate files into a common pool of data records.
(c) Data stored in a database is independent of the application programs using it.
(d) All of the above
Answer: (d) All of the above
Explanation: All listed properties describe the essential features of a well-designed database system.
36. Which one of the following statements is false?
(a) The data dictionary is normally maintained by the database administrator.
(b) Data elements in the database can be modified by changing the data dictionary.
(c) Data elements in the database can be modified by changing the data dictionary.
(d) The data dictionary is a tool used exclusively by the database administrator.
Answer: (b) Data elements in the database can be modified by changing the data dictionary.
Explanation: The data dictionary contains metadata, not actual data. You can’t change actual data by altering the dictionary.
37. It is better to use files than a DBMS when there are______________
(a) Stringent real-time requirements
(b) Multiple users wish to access the data
(c) Complex relationships among data
(d) All of the above.
Answer: (a) Stringent real-time requirements
Explanation: In time-critical systems, custom file-based systems may offer faster performance than general-purpose DBMSs.
38. Given the basic ER and relational model which of the following is incorrect?
(a) An entity can have more than one attribute
(b) An attribute of an entity can be composite.
(c) In a row of a relational table, an attribute has more than one value.
(d) In a row of a relational table, an attribute can have exactly one value or a NULL value.
Answer: (c) In a row of a relational table, an attribute has more than one value.
Explanation: This violates the first normal form (1NF), which states each cell must hold a single value.
39. The main function of a database management system (DBMS) is_________
(a) Modify the database
(b) Manage database
(c) Application Database
(d) Protect the database
Answer: (b) Manage database
Explanation: DBMS is responsible for managing and maintaining databases through access, updates, deletion, and storage.
40. Which of the following functions is not a function of the database management system_________
(a) Integrity control
(b) Failure recovery
(c) Concurrency control
(d) Processor Control
Answer: (d) Processor Control
Explanation: DBMS does not control the CPU. It manages data-related tasks such as concurrency, integrity, and backup.
41. The language used to define the schema, internal schema, and external schema in the database management system DBMS is_______
(a) C
(b) Basic
(c) DDL
(d) DML
Answer: (c) DDL
Explanation: DDL (Data Definition Language) is used to define database structures such as schema, tables, and indexes.
42. A database management system can implement operations such as querying, inserting, modifying, and deleting data in the database. This function is called_________
(a) Data definition function
(b) Data management function
(c) Data manipulation functions
(d) Data control function
Answer: (c) Data manipulation functions
Explanation: These are operations that allow the user to interact with and modify the data — part of DML (Data Manipulation Language).
43. A database management system is a set of software, which of the following functions does it have___________
(a) Database definition function
(b) Database management function
(c) Database modification function
(d) All of These
Answer: (d) All of These
Explanation: A DBMS includes all these core functionalities for handling the full lifecycle of data.
44. Transactional consistency refers to________
(a) All operations included in the transaction are either done or not done
(b) Once the transaction is committed, the changes to the data are permanent
(c) Operations and data used within a transaction are isolated from other concurrent transactions
(d) A transaction must change the database from one consistent state to another consistent state
Answer: (d) A transaction must change the database from one consistent state to another consistent state
Explanation: Transactional consistency ensures that a transaction leads the database from one valid state to another, preserving integrity.
45. Transaction isolation refers to______
(a) All operations included in the transaction are either done or not done
(b) Once a transaction is committed, changes to the database are permanent
(c) Operations and data used within a transaction are isolated from other concurrent transactions
(d) A transaction must change the database from one consistent state to another consistent state
Answer: (c) Operations and data used within a transaction are isolated from other concurrent transactions
Explanation: Isolation ensures that simultaneous transactions do not interfere with each other’s intermediate states.
MCQ on DBMS (Database Management System) Questions & Answers
| Question | Short Answer |
|---|---|
| 1. What does ACID stand for in DBMS transactions? | Atomicity, Consistency, Isolation, Durability |
| 2. Which normal form eliminates transitive dependencies? | 3NF (Third Normal Form) |
| 3. What is the primary key in a relational database? | Unique identifier for a table row |
| 4. Name the language used to define database schemas. | DDL (Data Definition Language) |
| 5. What type of DBMS model organizes data in a tree-like structure? | Hierarchical Model |
| 6. Which SQL command permanently saves transactions? | COMMIT |
| 7. What is a “deadlock” in DBMS? | Two transactions blocking each other indefinitely |
| 8. What does RAID stand for in storage systems? | Redundant Array of Independent Disks |
| 9. Which normal form requires elimination of multi-valued dependencies? | 4NF (Fourth Normal Form) |
| 10. What is the purpose of an index in a database? | Faster data retrieval |
| 11. Name the component that translates SQL queries into relational algebra. | Query Processor |
| 12. What is a “phantom read” in transaction isolation? | New rows appear in a re-executed query |
| 13. Which join returns all rows from both tables (matching + non-matching)? | FULL OUTER JOIN |
| 14. What is CAP theorem in distributed databases? | Consistency, Availability, Partition tolerance (pick 2) |
| 15. What does NoSQL stand for? | “Not Only SQL” |
| 16. Which protocol ensures conflict serializability? | Two-Phase Locking (2PL) |
| 17. What is a superkey? | A set of attributes that uniquely identifies a row |
| 18. Name the process of converting a table to a higher normal form. | Normalization |
| 19. What is “denormalization”? | Intentionally adding redundancy for performance |
| 20. Which SQL constraint ensures referential integrity? | FOREIGN KEY |
| 21. What is a materialized view? | Precomputed view stored physically |
| 22. Name the data structure commonly used for B-tree indexes. | Balanced tree |
| 23. What does OLAP stand for? | Online Analytical Processing |
24. Which SQL clause filters groups in a GROUP BY query? | HAVING |
| 25. What is a “dirty read” in transaction isolation? | Reading uncommitted data |
| 26. Name the algorithm used for deadlock detection. | Wait-for Graph |
| 27. What is the role of the Data Dictionary? | Metadata storage (tables, columns, constraints) |
| 28. Which normal form deals with partial dependencies? | 2NF (Second Normal Form) |
| 29. What is sharding in distributed databases? | Horizontal partitioning of data across servers |
| 30. Which SQL command restores the database to the last commit? | ROLLBACK |
| 31. What is a candidate key? | Minimal superkey (unique + irreducible) |
| 32. Name the isolation level that prevents dirty reads. | READ COMMITTED |
| 33. What is a composite key? | Primary key with multiple columns |
| 34. Which database model uses “edges” and “nodes”? | Graph Database |
35. What is the purpose of UNION in SQL? | Combine results of two SELECT queries (removes duplicates) |
| 36. What is a stored procedure? | Precompiled SQL code stored in DB |
| 37. Which theorem states that distributed systems cannot guarantee all of consistency, availability, and partition tolerance? | CAP Theorem |
| 38. What does SQL stand for? | Structured Query Language |
| 39. Name the protocol for timestamp-based concurrency control. | Timestamp Ordering Protocol |
| 40. What is Boyce-Codd Normal Form (BCNF)? | Strict 3NF (every determinant is a candidate key) |
| 41. Which join returns only matching rows from both tables? | INNER JOIN |
| 42. What is a weak entity in ER modeling? | Entity dependent on another (no key without owner) |
| 43. What does RAID 1 provide? | Mirroring (data duplication) |
| 44. Which SQL command removes a table? | DROP TABLE |
| 45. What is a checkpoint in DBMS recovery? | Point where all buffers are flushed to disk |
| 46. Name the process of splitting a table into smaller tables. | Partitioning |
| 47. What is a covering index? | Index that includes all columns needed for a query |
| 48. Which NoSQL database type stores key-value pairs? | Key-Value Store (e.g., Redis) |
49. What is the difference between DELETE and TRUNCATE? | TRUNCATE resets the table; DELETE removes rows one-by-one |
| 50. What is the role of a database cursor? | Traverse query results row-by-row |
DBMS (Database Management System)
Definition of DBMS
A database management system (DBMS) is a Software system used to create, maintain, and provide controlled access to a database.
What is DBMS
- A DBMS is computer software that defines, edits, receives, and manages the received data based on available parameters. Generally, a DBMS handles the data format, field name, record structure, and file structure, etc. like; MySQL, Microsoft Access, Oracle, etc.
- The full form of DBMS is Database Management System.
- The importance of databases has increased in this present information age. Therefore, databases are prepared in banks, railways, schools, businesses, and various government offices.
- With a database, we can easily analyze the data, so that both the user and the programmer can organize the available data in a better way. By analyzing which it becomes easy to arrive at a problem or prediction.
- In meteorology, space science, medical field, data plays an important role in predicting and catching a particular pattern. It acts as fuel in these areas.
- The size, capacity, and performance of the database are increasing in their respective orders of magnitude. The main reason for the increase in the performance of the database was the progress in computer processors, memory, and technology.
Properties of Database
Based on the data model or structure of the technological development of the database, it can be divided into three properties: navigational, relational, and post-relational.
- The Navigational Data Model in its early stages consisted of two main Hierarchical Models and the CODASYL (Network Model).
- The relational model was first proposed in 1970. The relational model employs a ledger-style table set to be used for different types of entities.
- Relational systems began to be used in large-scale data processing experiments in the 1990s. And by the year 2018, IBM, DBM2, Oracle, MySQL, and Microsoft SQL Server are the most searched DBMS servers.
Object databases were developed to overcome the inconvenience of impedance mismatches. Due to this, the development of the object-relational database was also done along with the post-relational. After that till the year 2000, the new generation of a relational database was recognized as the NoSQL database. NoSQL databases provide fast Value-Store as well as Document-Orientation. To fully understand the Database Management System, we need to know the definitions of its other elements. which is the following.
- Database – This is a well-organized collection of similar data. By which data can be easily obtained, created, and edited. Also, it is possible to store it in the format of a table, schema, report, etc.
- Data – Various types of information about any object or idea are called data. This information is uncertain and is processed and converted into information. It doesn’t make much sense. It is also called raw information in a common language.
Physically database servers are called dedicated computers, which run only DBMS software based on the actual database. Generally, database servers are multiprocessor computers. Raid Disk arrays are used for storage as well as fixed memory. Raid Disk is used for data recovery when a disk fails.
Types of DBMS
There are four types o Database, Network Database, Hierarchical Database, Relational Database, Object-Oriented Database,
Network Database
The network database is represented as a record. In which the relationship between one data to another data is shown as a link. In this model, it is possible to represent a record with different categories. That is, a child has many fathers. These models are used to represent complex relationships.
2. Hierarchical Database
This database is managed in the form of a tree structure (father-son) with nodes connected through links. top-bottom or top-bottom. In this model, the parent can handle multiple children. But, a child has only one father.
3. Relational Database
Relational databases are also known as structure databases. In which data is represented in a table format like Excel Rows & Columns. This database model is the most commonly used. Because it is the easiest model. It stores data in a fixed structure that can be edited by SQL.
4. Object-Oriented Database
This model stores the data in object form. Its structure is called class which represents the data. It displays data as a collection of objects.
Functions of a DBMS
Various types of functions are present in DBMS, with the help of which the database and the data in it are managed. There are mainly four functions. The details of which are as follows.
- Data Defining – Tasks like creation, modification, etc., by which data can be organized in a better way.
- Updating data – The actual data can be inserted, modified, and deleted by the functions present in the DBMS.
- Data Backup – DBMS is a powerful software with which we can easily back up the stored file.
- Administration – With the help of this function, the user registers, monitors, data security, etc., as well as recovers that data, which sometimes suddenly gets lost in the event of System Failure. (MCQ on DBMS)
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