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What are the four properties of a database transaction? This problem may be often seen in our daily study or work. I hope you can gain a lot from this question. The following is the reference content that the editor brings to you, let's take a look at it!

A transaction in a database refers to the process in which a logical unit performs a series of operations. A logical unit must have the following four properties to become a thing, namely atomicity, consistency, isolation and persistence.

Transactions in the database

A transaction is a series of operations performed as a logical unit, and a logical unit of work must have four attributes called ACID (atomicity, consistency, isolation, and persistence) attributes in order to become a transaction.

Atomicity

Transactions must be atomic units of work; either all or none of their data modifications are performed.

Consistency

All data must be kept in a consistent state when the transaction is completed. In the relevant database, all rules must be applied to the modification of the transaction to maintain the integrity of all data. At the end of the transaction, all internal data structures, such as B-tree indexes or two-way linked lists, must be correct.

Isolation

Changes made by concurrent transactions must be isolated from changes made by any other concurrent transactions. The state in which the data is in when the transaction views the data, either the state before it is modified by another concurrent transaction or after it is modified by another transaction, and the transaction does not view the data in the intermediate state. This is called serializability because it can reload the starting data and replay a series of transactions so that the state at the end of the data is the same as that in which the original transaction was executed.

Persistence

After the transaction is completed, its impact on the system is permanent. The modification will be maintained even in the event of a system failure.

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