Dbms acid
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A database transaction must possess four key properties known as ACID: Atomicity, Consistency, Isolation, and Durability. Atomicity means that either all tasks of a transaction are performed or none are. Consistency ensures transactions produce valid, rule-abiding data. Isolation means other operations cannot access intermediate transaction data. Durability guarantees completed transactions are recorded to durable storage. These ACID properties are crucial for maintaining database integrity and performance during concurrent transactions.
![DATABASE TRANSACTION
A transaction comprises a unit of work
performed within a database management
system.
A database transaction, by definition, must
be atomic, consistent, isolated and durable.[1]
Database practitioners often refer to these
properties of database transactions using the
acronym ACID.](https://image.slidesharecdn.com/dbms-acid-140816132451-phpapp02/85/Dbms-acid-2-320.jpg)
Dbms acid
- 1. DBMS Zaheer Uddin Soomro Database transaction ACID Properties
- 2. DATABASE TRANSACTION A transaction comprises a unit of work performed within a database management system. A database transaction, by definition, must be atomic, consistent, isolated and durable.[1] Database practitioners often refer to these properties of database transactions using the acronym ACID.
- 3. ATOMICITY Atomicity refers to the ability of the database to guarantee that either all of the tasks of a transaction are performed or none of them are. Each transaction is said to be atomic if when one part of the transaction fails, the entire transaction fails.
- 4. CONSISTENCY Ensures that only valid data following all rules and constraints is written in the database. When a transaction results in invalid data, the database reverts to its previous state, which abides by all customary rules and constraints
- 5. ISOLATION Isolation refers to the requirement that other operations cannot access or see the data in an intermediate state during a transaction. This constraint is required to maintain the performance as well as the consistency between transactions in a database. Thus, each transaction is unaware of another transactions executing concurrently in the system.
- 6. DURABLE Durability means that once a transaction is complete, it is guaranteed that all of the changes have been recorded to a durable medium (such as a hard disk), and the fact that the transaction has been completed is likewise recorded.