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ACID Transactions

What are ACID Transactions?

ACID transactions are qualities that assure database transaction dependability and consistency. ACID (Atomicity, Consistency, Isolation, and Durability) are the four important ACID properties required for trustworthy database transactions.

  • Atomicity – A transaction’s attribute that permits it to be seen as a single unit of work. The database consistency is maintained by rolling back the whole transaction if a single step fails.
  • Consistency – The property of a transaction in which the database is moved from one consistent state to another when the transaction is finished. To maintain data consistency, integrity restrictions such as foreign keys and uniqueness constraints are applied.
  • Isolation – The feature of a transaction that appears to occur independently of other transactions. Only after a transaction has been committed should the changes it has made be apparent to other transactions.
  • Durability– Refers to a transaction’s property in which the changes produced by the transaction are permanent and can withstand any future failures, such as power outages or system crashes.

ACID transactions are necessary for preserving data integrity and consistency in databases, particularly in key applications like banking and finance, where correctness and dependability are required. ACID properties contribute to the dependability and trustworthiness of database systems by guaranteeing that transactions are completed in a consistent and reliable way.

The ACID principles offer a framework for building reliable and consistent database transactions, while the ACID rules provide the exact criteria that transactions must achieve to adhere to those principles. Database systems may ensure data integrity and consistency even in the face of failures or other problems by ensuring that transactions adhere to certain principles and standards.

ACID Database

An ACID database is one that follows the ACID principles and rules to assure data consistency, integrity, and dependability. ACID databases are often used in applications requiring precision and dependability, such as banking and finance, healthcare, and e-commerce.

ACID databases are intended to ensure that transactions are completed consistently and reliably, even in the face of failures or mistakes. This is accomplished by ensuring that transactions are handled as atomic, indivisible units of work that maintain database consistency by conforming to integrity requirements and other criteria.

Oracle, Microsoft SQL Server, PostgreSQL, and MySQL are examples of prominent ACID databases. These databases are popular in corporate applications because of their dependability, scalability, and performance.

NoSQL databases, which emphasize scalability and flexibility above strict adherence to ACID standards, are often compared with ACID databases. While NoSQL databases are frequently more flexible and capable of handling enormous amounts of data, they may compromise some consistency and dependability in the process.

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Importance of ACID Transactions

  • Transaction Isolation– One of the key features of ACID transactions is transaction isolation, which creates a perception that one transaction is running independently of another. This guarantees that changes made by one transaction are not visible to other transactions until the transaction is committed, which aids in the prevention of data inconsistencies and conflicts.
  • Versatility– ACID transactions are scalable and may be utilized in large-scale distributed systems, enabling numerous transactions to run simultaneously while retaining consistency and dependability.
  • Integrity– Database consistency and reliability are maintained thanks to ACID transactions, which guarantee the consistent and repeatable execution of all database operations.
  • Trustworthiness– ACID transactions guarantee that any changes a transaction makes are permanent and can withstand future failures, such as power outages or system crashes. This contributes to the dependability and stability of database systems, especially in difficult circumstances.


ACID transactions are required in database systems to preserve data consistency, dependability, and integrity. They contribute to the correctness and dependability of essential applications, as well as the capacity of database systems to expand and evolve while maintaining a high degree of reliability and consistency.