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What is transaction consistency? I believe that many inexperienced people are at a loss about this, so this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

The consistency of a transaction means that a transaction must change the database from one consistency state to another. In order to ensure the correct execution of the transaction and maintain the integrity of the database, the transaction must have the following characteristics: atomicity, consistency, isolation and persistence.

The consistency of a transaction means that a transaction must change the database from one consistency state to another.

Parsing:

In order to ensure the correct execution of the transaction and maintain the integrity of the database, the transaction must have the following characteristics: atomicity, consistency, isolation and persistence. Consistency refers to the isolated execution of transactions (no concurrent transactions) to maintain the consistency of the database.

Detailed introduction:

Nature:

1. Atomicity: all operations in a transaction are inseparable in the database, and either all are completed or not executed.

2. Consistency: several transactions executed in parallel, the execution results must be consistent with the results executed in a certain order.

3. Isolation: the execution of a transaction is not disturbed by other transactions, and the intermediate results of transaction execution must be transparent to other transactions.

4. Durability: for any committed transaction, the system must ensure that the changes made by the transaction to the database are not lost, even if the database fails.

The ACID feature of transactions is realized by relational database system (DBMS). DBMS uses logs to ensure the atomicity, consistency and persistence of transactions.

The log records the updates made by the transaction to the database. If an error occurs during the execution of a transaction, the update made by the transaction to the database can be undone according to the log, so that the database can be rolled back to the initial state before the transaction is executed.

After reading the above, have you mastered what is the method of transaction consistency? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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