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Which of the following statements best describes a database transaction?
- a)A sequence of SQL statements executed on a database
- b)A collection of database tables
- c)A unit of work that must be performed as a whole or not at all
- d)A set of columns in a database table
Correct answer is option 'C'. Can you explain this answer?
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Which of the following statements best describes a database transactio...
A database transaction is a unit of work that should be executed as a complete entity. It ensures that either all the changes made by the transaction are applied to the database (committed) or none of them are (rolled back).
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Which of the following statements best describes a database transactio...
Database Transaction Explanation:
Transaction in a database refers to a logical unit of work that contains one or more SQL statements. It is a fundamental concept in database management systems that ensures data integrity and consistency.
Key Points:
- Unit of Work: A transaction is a unit of work that must be performed as a whole or not at all. This means that either all the operations within the transaction are successfully completed, or none of them are.
- Atomicity: Transactions follow the principle of atomicity, which ensures that either all the changes made by the transaction are committed to the database, or none of them are. This helps in maintaining data integrity.
- Consistency: Transactions ensure that the database remains in a consistent state before and after the transaction is executed. Any changes made by the transaction should follow the defined rules and constraints of the database.
- Isolation: Transactions should be isolated from other transactions running concurrently. This means that the changes made by one transaction should not be visible to other transactions until the transaction is committed.
- Durability: Once a transaction is committed, the changes made by the transaction should be permanent and survive system failures. This ensures that the data remains consistent even in case of crashes or errors.
Overall, a database transaction is a crucial concept that helps in maintaining data integrity, consistency, and reliability in database systems.
Transaction in a database refers to a logical unit of work that contains one or more SQL statements. It is a fundamental concept in database management systems that ensures data integrity and consistency.
Key Points:
- Unit of Work: A transaction is a unit of work that must be performed as a whole or not at all. This means that either all the operations within the transaction are successfully completed, or none of them are.
- Atomicity: Transactions follow the principle of atomicity, which ensures that either all the changes made by the transaction are committed to the database, or none of them are. This helps in maintaining data integrity.
- Consistency: Transactions ensure that the database remains in a consistent state before and after the transaction is executed. Any changes made by the transaction should follow the defined rules and constraints of the database.
- Isolation: Transactions should be isolated from other transactions running concurrently. This means that the changes made by one transaction should not be visible to other transactions until the transaction is committed.
- Durability: Once a transaction is committed, the changes made by the transaction should be permanent and survive system failures. This ensures that the data remains consistent even in case of crashes or errors.
Overall, a database transaction is a crucial concept that helps in maintaining data integrity, consistency, and reliability in database systems.
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Which of the following statements best describes a database transaction?a)A sequence of SQL statements executed on a databaseb)A collection of database tablesc)A unit of work that must be performed as a whole or not at alld)A set of columns in a database tableCorrect answer is option 'C'. Can you explain this answer?
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Which of the following statements best describes a database transaction?a)A sequence of SQL statements executed on a databaseb)A collection of database tablesc)A unit of work that must be performed as a whole or not at alld)A set of columns in a database tableCorrect answer is option 'C'. Can you explain this answer? for Software Development 2024 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about Which of the following statements best describes a database transaction?a)A sequence of SQL statements executed on a databaseb)A collection of database tablesc)A unit of work that must be performed as a whole or not at alld)A set of columns in a database tableCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Software Development 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements best describes a database transaction?a)A sequence of SQL statements executed on a databaseb)A collection of database tablesc)A unit of work that must be performed as a whole or not at alld)A set of columns in a database tableCorrect answer is option 'C'. Can you explain this answer?.
Which of the following statements best describes a database transaction?a)A sequence of SQL statements executed on a databaseb)A collection of database tablesc)A unit of work that must be performed as a whole or not at alld)A set of columns in a database tableCorrect answer is option 'C'. Can you explain this answer? for Software Development 2024 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about Which of the following statements best describes a database transaction?a)A sequence of SQL statements executed on a databaseb)A collection of database tablesc)A unit of work that must be performed as a whole or not at alld)A set of columns in a database tableCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Software Development 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements best describes a database transaction?a)A sequence of SQL statements executed on a databaseb)A collection of database tablesc)A unit of work that must be performed as a whole or not at alld)A set of columns in a database tableCorrect answer is option 'C'. Can you explain this answer?.
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