Question
List and briefly explain the ACID properties of a database transaction.
Answer
Organizations today expects the highest level of data integrity during data transaction processing. The transaction in the database management system must follow all four attributes to ensure the integrity of the transaction. They are:
- Atomic
- Consistent
- Isolated
- Durable
These four are called ACID properties. Their details are as follows:
Atomic
Subdivided transactions are not allowed; transactions must be fully processed. The database should be updated only when the transaction is successful. If any transaction fails during the transaction, no changes to the database are allowed.
Consistent
The constraint in the database must be consistent before and after the transaction process.
Isolated
The database should be updated only when the transaction process is successfully committed. During transaction processing, changes to the database should not be disclosed to users, and should only be made public after the transaction is completed.
Durable
The changes made in the database should be permanent. Once a transaction process is committed after the changes, the transaction cannot be reversed when a failure occurs.
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