10 recommended articles about commit

Using retention points, simple ROLLBACK and COMMIT statements can write or undo the entire transaction. However, this is only possible for simple transactions; more complex transactions may require partial commit or rollback. For example, the process of adding an order described earlier is a transaction. If an error occurs, just go back to before adding the orders row; there is no need to fall back to the customers table (if it exists). To support rolling back part of a transaction, it must be possible to place placeholders at appropriate locations within the transaction block. This way, if you need to roll back, you can fall back to a placeholder. These placeholders are called retention points. To create a placeholder, use the SAVEPOINT statement as follows: Enter: savepoint delete; Each savepoint is given a unique name that identifies it so that when it rolls back, MySQL knows where to roll back. In order to rollback to the retention points given in this example, you can proceed as follows: Enter: rollback to deletel; the more retention points, the better. You can set as many retention points as you want in the MySQL code, the more

1. Detailed introduction to changing the default

##Introduction: Use simple ROLLBACK and retention points The COMMIT statement can write or undo the entire transaction. However, this is only possible for simple transactions; more complex transactions may require partial commit or rollback. For example, the process of adding an order described earlier is a transaction. If an error occurs, just go back to before adding the orders row; there is no need to fall back to the customers table (if it exists). To support rolling back part of a transaction, it must be possible to place placeholders at appropriate locations within the transaction block. In this way, such as...

2. php mysqli_commit() function and mysqli_autocommit() function comparison

Introduction:

3. MySQL transaction-detailed explanation of using retention points and changing the default commit behavior

Introduction: Using retention points, simple ROLLBACK and COMMIT statements can write or undo the entire transaction. However, this is only possible for simple transactions; more complex transactions may require partial commit or rollback. For example, the process of adding an order described earlier is a transaction. If an error occurs, just go back to before adding the orders row; there is no need to fall back to the customers table (if it exists). To support rolling back part of a transaction, placeholders must be placed at appropriate locations in the transaction block. This way, if you need to roll back, you can fall back to a placeholder.

4. MySQL transaction-ROLLBACK, detailed explanation of COMMIT usage

Introduction: Using ROLLBACK Now that we know what transaction processing is, let's discuss the issues involved in the management of transaction processing. The key to managing transaction processing is to break down groups of SQL statements into logical chunks and clearly define when data should and should not be rolled back. MySQL uses the following statement to identify the start of a transaction:

5. Detailed introduction to transaction processing in PDO

Introduction: A transaction is composed of a sequence of query and/or update statements. Use begin and start transaction to start a transaction, rollback to roll back the transaction, and commit to commit the transaction. After starting a transaction, there can be several SQL queries or update statements. After each SQL is submitted for execution, there should also be statements to determine whether it is executed correctly to determine whether to roll back in the next step. If all are executed correctly, the transaction is finally committed. Once a transaction is rolled back, the database remains in the state it was in before the transaction started. It is like if an edited file is exited without saving, the original appearance of the file will be retained. So, a transaction can be considered an atomic operation, SQL within the transaction, or all

6. In-depth understanding of the 4 types of isolation levels in mysql

##Introduction : The SQL standard defines four types of isolation levels, including some specific rules to limit which changes inside and outside the transaction are visible and which are invisible. Lower isolation levels generally support higher concurrency and have lower system overhead. Read Uncommitted (read uncommitted content) At this isolation level, all transactions can see the execution results of other uncommitted transactions. This isolation level is rarely used in practical applications because its performance is not much better than other levels. Reading uncommitted data is also called dirty reading (Dirt

7. MySQL Transaction Processing Basics

##Introduction: What is a MySQL transaction? A transaction generally refers to something to be done or done. In computer terms, it refers to accessing and possibly updating a database. A program execution unit (unit) for various data items in it. 2. When is it used? It is generally used when operating multiple tables concurrently to ensure the integrity of the user's data. 3. How to use MYSQL? There are two main methods of transaction processing 1. Use begin, rollback, and commit to implement begin to start a transaction roll

8.

Detailed introduction to Spring transaction principles

Introduction: 1. Basic principles of transactions The essence of Spring transactions is actually the database’s support for transactions. Without database transaction support, Spring cannot provide transaction functions. For pure JDBC operation database, if you want to use transactions, you can follow the following steps: Get the connection Connection con = DriverManager.getConnection() Open the transaction con.setAutoCommit(true/false); Perform CRUD submission Transaction/rollback transaction con.commit() / c..

9.

Database - A brief discussion of four transaction isolation levels

Introduction: The database provides four transaction isolation levels. Different isolation levels are implemented using different lock classes. In the four isolation levels Among the levels, Serializable has the highest level, and Read Uncommited has the lowest level. The default isolation level of most databases is: Read Commited, such as Sql Server, Oracle. The default isolation level of a few databases is Repeatable Read, such as MySQL InnoDB storage engine

10.

A brief introduction to mysql cluster (picture)

## Introduction: 1. What is MySQL Cluster? MySQL Cluster is a shared-nothing, distributed node architecture storage solution. Its purpose is to provide fault tolerance and high performance. Data updates use read-committed isolation level. committedisolation) to ensure the consistency of data on all nodes, and a two-phase commit mechanism (two-phased commit) to ensure that all nodes have the same data (if any write operation fails, the update fails).

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