Which of the given options define a transaction correctly?a)A transaction consists of DDL statements on the database schema.b)A transaction consists of COMMIT or ROLLBACK in a database session.c)A transaction consists of either a collection of DML statements or a DDL or DCL or TCL statement to form a logical unit of work in a database session.d)A transaction consists of collection of DML and DDL statements in different sessions of the database.Correct answer is option 'C'. Can you explain this answer?

Question

Answer

Explanation:

A transaction is a sequence of operations performed on a database that must be treated as a single unit of work. It ensures the consistency, integrity, and durability of the database. The correct definition of a transaction is provided in option C, which states that a transaction consists of either a collection of DML statements or a DDL or DCL or TCL statement to form a logical unit of work in a database session. Let's understand each component mentioned in the option:

DML (Data Manipulation Language) statements:
DML statements are used to retrieve, manipulate, and modify the data stored in the database. Examples of DML statements include SELECT, INSERT, UPDATE, and DELETE. These statements are used to perform operations on the data within a transaction.

DDL (Data Definition Language) statements:
DDL statements are used to define or modify the structure of the database schema. These statements include CREATE, ALTER, and DROP statements. Although DDL statements are not typically part of a transaction, they can be included in a transaction to ensure the atomicity of a set of operations.

DCL (Data Control Language) statements:
DCL statements are used to control access to the database. These statements include GRANT and REVOKE, which are used to grant or revoke permissions on database objects. DCL statements are also not typically part of a transaction, but they can be included if necessary.

TCL (Transaction Control Language) statements:
TCL statements are used to control the transactions in a database session. These statements include COMMIT, ROLLBACK, and SAVEPOINT. COMMIT is used to save the changes made in a transaction, ROLLBACK is used to undo the changes made in a transaction, and SAVEPOINT is used to set a point in the transaction from which it can be rolled back.

Therefore, a transaction can consist of a collection of DML statements to manipulate the data, or a DDL or DCL or TCL statement to modify the database schema or control the transactions. These statements together form a logical unit of work in a database session, ensuring the atomicity, consistency, isolation, and durability properties of a transaction.

Similar Computer Science Engineering (CSE) Doubts

Given below are two statements:Statement I: Hardwired control unit can be optimized to produce fast mode of operation.Statement II: Indirect addressing mode needs two memory reference to fetch the operand.In the light of the above statements. choose the correct answer from the options given below

Statement 1: Ambiguity is the property of grammar but not the language.Statement 2: Same language can have more than one grammar.Which of the following options are correct with respect to the given statements?

Top Courses for Computer Science Engineering (CSE)View all

GATE Computer Science Engineering(CSE) 2025 Mock Test Series

Question Bank for GATE Computer Science Engineering

General Aptitude for GATE

Computer Networks

Programming and Data Structures

Top Courses for Computer Science Engineering (CSE)

Top Courses for Computer Science Engineering (CSE)

Suggested Free Tests

Related Content

Mock Test Series

Subject-wise Courses

Subject-wise Courses

Other Engg Branches

Company