Database Management Systems Overview

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Questions and Answers

Which command in Data Definition Language is used to delete objects from a database?

  • RENAME
  • DROP (correct)
  • ALTER
  • TRUNCATE

What does the ROLLBACK command do in Transactional Control Language?

  • Cancels or undoes changes made in the database (correct)
  • Creates a new transaction
  • Checks the validity of transactions
  • Saves changes to the database

Which of the following commands is used for granting permissions in Data Control Language?

  • PERMIT
  • ALLOW
  • ENABLE
  • GRANT (correct)

Which command is classified as a Data Manipulation Language operation?

<p>SELECT (D)</p> Signup and view all the answers

What is the primary function of the Data Definition Language?

<p>Defining database schemas and structures (C)</p> Signup and view all the answers

What is a common use of the COMMIT command in Transactional Control Language?

<p>To apply or save changes in the database (B)</p> Signup and view all the answers

Which of the following commands is part of Data Manipulation Language for updating existing data?

<p>UPDATE (A)</p> Signup and view all the answers

What does the SAVEPOINT command do in Transactional Control Language?

<p>Indicates a point in a transaction to which you can later roll back (A)</p> Signup and view all the answers

What is the primary function of a database platform?

<p>To provide a single interface for accessing multiple databases (A)</p> Signup and view all the answers

Which feature of a DBMS ensures users can access the database without data conflicts?

<p>Concurrency control (D)</p> Signup and view all the answers

How does a Relational Database Management System (RDBMS) organize data?

<p>In the form of tables with rows and columns (B)</p> Signup and view all the answers

Which of the following is NOT a key feature of a DBMS?

<p>Customization of user interfaces (C)</p> Signup and view all the answers

What type of database management system is designed for high-performance scenarios?

<p>Non-Relational Database Management System (NoSQL) (C)</p> Signup and view all the answers

Which mechanism in a DBMS helps to protect data against loss during a system failure?

<p>Backup and recovery (C)</p> Signup and view all the answers

Which statement accurately describes a NoSQL database?

<p>It utilizes documents, key-value pairs, or graphs for data organization. (B)</p> Signup and view all the answers

Which of the following best describes data integrity within a DBMS?

<p>The accuracy and consistency of data within a database (C)</p> Signup and view all the answers

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Flashcards

Database Platform

A company or service that provides access to a collection of databases through a single interface. It enables organizations to store, organize, retrieve, and manipulate data efficiently.

Database Management System (DBMS)

Software that manages and organizes data in a structured way. It allows users to create, modify, and query databases, and control security and access.

Data Modeling

A DBMS feature that defines the structure and relationships of data in a database.

Data Storage & Retrieval

A DBMS feature responsible for storing and retrieving data from the database. It offers various search and query methods.

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Concurrency Control

A DBMS feature that ensures multiple users can access data without conflicts.

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Data Integrity & Security

A DBMS feature that enforces rules and restricts access to protect data integrity and security.

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Backup & Recovery

A DBMS feature that creates backups and recovers data in case of system failure.

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Relational Database Management System (RDBMS)

A type of DBMS that organizes data in tables with rows and columns. Data is linked through keys.

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What is DDL?

Data Definition Language (DDL) defines the structure of a database, including tables, columns, and relationships.

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What are some DDL commands?

DDL commands like CREATE, ALTER, DROP, TRUNCATE, COMMENT, and RENAME manipulate the database schema.

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What is DML?

Data Manipulation Language (DML) is used to interact with data within a database.

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What are some DML commands?

DML includes commands like SELECT, INSERT, UPDATE, and DELETE, which are used to retrieve, add, modify, and remove data.

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What is DCL?

Data Control Language (DCL) grants or revokes permissions for users to access and manipulate data in a database.

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What are some DCL commands?

DCL commands like GRANT and REVOKE control access to database objects like tables.

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What is TCL?

Transactional Control Language (TCL) manages transactions within a database. These transactions are groups of database operations that are treated as a single unit.

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What are some TCL commands?

TCL commands like COMMIT, ROLLBACK, and SAVEPOINT control transaction execution, saving, and restoration.

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Study Notes

Database Platform

  • A database platform is a company or service providing single-interface access to multiple databases.
  • It's the technology supporting efficient data storage, organization, retrieval, and manipulation.
  • It's analogous to a library catalog: the catalog doesn't contain the books, but it helps find them. The platform doesn't hold the data itself, but it provides access to data from various sources.

Database Management System (DBMS)

  • A DBMS is software designed to manage and organize data in a structured way.
  • It helps create, modify, query, and secure databases.
  • Users can also control access permissions.

Key Features of DBMS

  • Data Modeling: DBMS provides tools for creating and altering data models, defining the structure and relationships within the database.
  • Data Storage and Retrieval: The DBMS manages data storage and retrieval, offering various methods for searching and querying.
  • Concurrency Control: Mechanisms are in place to manage concurrent database access by multiple users, preventing conflicts.
  • Data Integrity and Security: Includes mechanisms for enforcing data integrity constraints and managing access to the data.
  • Backup and Recovery: Tools are available for backing up and restoring data in case of system failures.

Types of DBMS

  • Relational Database Management System (RDBMS): Organizes data in tables with rows and columns, linked using primary and foreign keys.
  • Non-Relational Database Management System (NoSQL): Organizes data as key-value pairs, documents, graphs, or column-based formats. Tailored for large-scale, high-performance scenarios.

Database Languages

  • Data Definition Language (DDL): Deals with database schemas and descriptions (how data resides in the database).
    • CREATE: Creates databases and objects.
    • ALTER: Modifies existing database structure.
    • DROP: Deletes database objects.
    • TRUNCATE: Removes all records from a table, including allocated space.
    • COMMENT: Adds comments to the data dictionary.
    • RENAME: Renames database objects.
  • Data Manipulation Language (DML): Deals with data manipulation (storing, modifying, retrieving, deleting, updating).
    • SELECT: Retrieves data from the database.
    • INSERT: Adds data to a table.
    • UPDATE: Modifies data within a table.
    • DELETE: Removes data from a table.
  • Data Control Language (DCL): Controls access permissions to the database.
    • GRANT: Grants permissions.
    • REVOKE: Revokes permissions.
  • Transactional Control Language (TCL): Manages transactions in a database.
    • COMMIT: Applies changes to the database.
    • ROLLBACK: Cancels changes made in a transaction.
    • SAVEPOINT: Saves a point in a transaction for rollback.

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