postgres transaction

There are three types of Java transactions: JDBC Transactions, JTA (Java Transaction API) transactions, container transactions. Common container transactions such as spring transactions, container transactions are mainly provided by the Java Application Server, container transactions are mostly based on JTA completion, which is a jndi based, rather complex API implementation. So this article does not discuss container transactions. This article mainly

I. Four basic characteristics of database transactionsA transaction is a series of operations performed as a logical unit, and a logical work cell must have four properties , called ACID(atomicity, consistency, isolation, and persistence) properties, in order to be a transaction.　1. atomicity (atomicity): The operations contained in a transaction are treated as

About MySQL transaction isolation level and MySQL transaction isolation level This article elaborates four concepts related to databases: transactions, database read phenomena, isolation levels, and lock mechanisms. I. Transactions Let's take a look at Baidu encyclopedia's definition of database transactions: Perform a series of operations as a single logical unit, either completely or completely.

Spring transaction isolation level and propagation mechanism, spring + mybatis + atomikos for Distributed Transaction Management, mybatisatomikosThis article is reproduced in. It must follow four principles (ACID ). 2. Transaction type 3. Spring transaction isolation level: spring has five isolation levels, which are d

There are four database isolation levels, as described in the high-performance mysql book: Then let's talk about how to modify the transaction isolation level: 1. Modify the global settings, modify the mysql. ini configuration file, and add Copy codeThe Code is as follows:# Optional parameters include: READ-UNCOMMITTED, READ-COMMITTED, REPEATABLE-READ, SERIALIZABLE.[Mysqld]Transaction-isolation = REPEATA

Today, when I was studying JDBC, I saw a problem about the isolation level of MySql transactions. I felt that the content was quite advanced. So I recorded an article for later use. There are four database isolation levels, as described in the high-performance mysql book: Then let's talk about how to modify the transaction isolation level: 1. Modify the global settings, modify the mysql. ini configuration file, and add 1 # optional parameters incl

I. Overview of transactions This section is purely for writing and writing, right when the knowledge of the database and familiar with how to write a blog, who let their dishes. ：） Read a lot of other blogs and materials, business two words are fast not to know, then actually the concept of business is very simple, can be understood as one thing, in the computer, it is a sequence of operations. It differs from ordinary things in that it must obey the acid principle specified by ISO/IEC.

I. Understanding of isolation Levels1. Dirty ReadingFirst, it is understood that a transaction has changed the data, although the transaction has not yet been committed, but at this point the data found by the other statements is changed after the transaction. Verify the following:A simple user tableWe run the following statement 1233 line, open the

MySQL Stored Procedure Transaction Management and mysql Stored Procedure transaction ACID: Atomic, Consistent, Isolated, Durable A storage program provides an excellent mechanism to define, encapsulate, and manage transactions. 1. MySQL transaction support MySQL transaction support is not bound to the MySQL server it

One Spring transaction is widely used by transactions. One transaction method should not call another transaction method. Otherwise, two transactions will be generated. As a result, developers are tied up when designing transaction methods for fear of stepping on the mines accidentally.In fact, this is a misunderstandi

Tags: nis ted field full name Commit tab get MIT Excerpt from: http://www.cnblogs.com/fjdingsd/p/5273008.html This article tells the four characteristics (ACID) of transactions in the database, and will explain the isolation level of the transaction in detail. If a database claims to support transactional operations, then the database must have the following four features:⑴ atomicity (atomicity)　Atomicity means that all the operations contained in a

Original: http://www.cnblogs.com/fjdingsd/p/5273008.htmlThis article tells the four characteristics (ACID) of transactions in the database, and will explain the isolation level of the transaction in detail.If a database claims to support transactional operations, then the database must have the following four features:⑴ atomicity (atomicity)Atomicity means that all the operations contained in a transaction

Transaction nature and isolation level, transaction nature isolation levelTransaction concept Transaction is the basic unit of concurrency control. A transaction is a sequence of operations. These operations are either executed or not executed. It is an inseparable unit of work. Transactions are proposed mainly to solv

, and the state change must also be undone. This may involve invoking the service again and performing another reversal of the effect of the action. Solution SolutionsImplement a compensating transaction. The steps in a compensating transaction must undo the effects of the steps in the original operation. A compensating transaction might not being able to simply