mysql transaction

A strange thing happened to the recent payment business, after a transaction failed, call rollback and found that only the last SQL was rollback.Development looked for a long time, found that the network jitter, causing the first time to create a

Requirements Description:Case background: In the course of bank transfer, accidents are unavoidable. To avoid unnecessary losses caused by an accident, the transaction is handled in the same way:A account has an existing balance of $1000 and a

Version 1.MySQLMysql> Selectversion ();+------------+|Version ()|+------------+| 5.5.Panax Notoginseng-Log |+------------+1Rowinch Set(0.00Sec2. Create a test tableMysql> Create TableTest_trans (IDint, name_varchar(Ten)); Query OK,0Rows Affected (0.2

What is a transactionA set of SQL statements Action Unit group all SQL complete a business if the entire group succeeds, meaning that all the SQL within the group succeeds if either one fails, meaning the entire operation failsThe data goes back to

MySQL Transaction ISOLATION level detailedBlog Category: Sql MySQL data structure SQLThe SQL standard defines a Class 4 isolation level, which includes specific rules to define which changes within and outside the transaction are

MySQL transaction isolation level and lockTable structureCREATE TABLE record (ID int auto_increment primary key,title varchar (255) not null,shortname varchar (255) Not Null,authorid int not null,createtime datetime does null,state int not

MySQL transaction processing (the engine of the table must be INNODB/BDB)There are two main types of two methods: the first is recommended1. Using Begin,rollback,commit to achieveBegin a transactionROLLBACK TRANSACTION RollbackCommit TRANSACTION

1. What is a transactionA transaction is a combination of one or more database operation statements with acid,4 characteristics.Atomicity: Either all succeeds or all is undoneIsolation: Transactions are independent from one another and are not

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This article analyzes the MySQL transaction problem in PHP. Share to everyone for your reference, specific as follows: For MyISAM databases, you can control the conduct of transactions: $MYSQLRL = mysql_connect ($db _config ["host"], $db

Recently to some students asked me some of the relevant knowledge of the business, under high concurrency, what is the performance impact of the transaction? Will there be a problem with clogging? How MySQL handles these ..... Suddenly I remember

Transactionfirst, the conceptA database transaction is a sequence of operations performed as a single logical unit of work , either completely or completely Transaction. Transaction processing ensures that data-oriented resources are not

All along, the understanding of the database's transaction isolation mechanism always stays on the surface, and its contents are also looked over and forgotten. These two days decided to understand it in principle and to sort out their own knowledge.

1. Transaction processing and concurrency1.1. Basic knowledge and related concepts1) All table types can use locks, but only InnoDB and BDB have built-in transactional functionality.2) Start the transaction using begin, use commit to end the

1. What is a transactionA transaction is a combination of one or more database operation statements with acid,4 characteristics.Atomicity: Either all succeeds or all is undoneIsolation: Transactions are independent from one another and are not

There are two main ways to handle MYSQL transactions.1, with Begin,rollback,commit to achieveBegin a transactionROLLBACK TRANSACTION RollbackCommit TRANSACTION Acknowledgement2, directly with set to change the MySQL automatic submission modeMYSQL is

Prior to the operation of the database, it was found that some content should be submitted as a transaction, rather than being submitted separately, which would require these operations to be handled as a transaction. And I have previously written a

Transaction ISOLATION LEVELThe database transaction isolation level, in which only one transaction can read intermediate results for other transactions.READ UNCOMMITTED (Read UNCOMMITTED content)At this isolation level, all transactions can see the

　　Early writing articles, re-review and study under:By sql:1992 transaction ISOLATION level, InnoDB is repeatable read (repeatable read) by default. MYSQL/INNODB provides all four transaction isolation levels described by the SQL standard. You can

I. Four elements of a transactionThe four basic elements that database transactions perform correctly include atomicity (atomicity), consistency (consistency), isolation (isolation), persistence (durability), or acid. There are two main ways to