m a transactions database

Tags: no mysql SQL blog money features mit ora processHttp://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

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 are either all successful or fail back, which is the same concept as the previous two blogs about

Label:First, the basic knowledge 1) Using transaction level readuncommited results in dirty reads, which means that the read is uncommited (uncommitted) data. How do you understand it? After a transaction that uses this isolation level begins. Updated the data of a row of the database, but the workload of the transaction is relatively large, followed by

CI source code analysis (III)-DB transactions, ci source database transactions(0) UsageYou can use the method provided by the system: $ this-> db-> trans_start (); // start the transaction $ this-> db-> query (); // execute sqls $ this-> db-> trans_complete (); // end the transaction (do not worry about rollback) if! $ This-> db-> trans_status do something; // ha

Database transactions and locks Transaction:Brief IntroductionConcepts and featuresTransactionsConsiderations for using transactionsTransaction type　　 Lock:Functions of locks and locksSpace ManagementResources that can be lockedLock type and its compatibilityDeadlockSession-level locks and table-level locks　　 Brief Introduction　　Relational databases

Background: Transactions are a basic concept of a database management system, and transactions have four basic characteristics, namely, acid: atomicity (atomicity), consistency (consistency), isolation (isolation), and persistence (durability), The consistency and integrity

What is a database transaction? Database transactions are a series of operations performed as a single logical unit of work. Imagine a transaction for online shopping. the payment proce