commit rollback

InnoDB Overview InnoDB provides MySQL with a transaction-safe (acid-compatible) storage engine with Commit, rollback, and crash resiliency. InnoDB locks the row-level and also provides an Oracle-style, non-locking read in the SELECT statement. These

To find the storage engine for a database:Show enginesShow variables like '%storage_engine% 'Change the engine of the database to change the configuration file/etc/my.cnfModify Default-storage-engine=innodb (the storage engine that needs to be

NOLOCK (without lock)When this option is selected, SQL Server does not add any locks when reading or modifying data. In this case, it is possible for the user to read the data in the incomplete transaction (uncommited Transaction) or rollback (roll

Http://www.cnblogs.com/xrq730/p/4937222.htmlObjectiveThe database storage engine is the database's underlying software organization, and the Database management system (DBMS) uses the data engine to create, query, update, and delete data. Different

1. Transaction: Indicates that a set of operations either succeeds, has a failure, and all operations fail. To use a transaction in MySQL, start the transaction first, the statement start transaction, commit the transaction: Commit ROLLBACK

Transactions are one of the core concepts in the database system. Applications can control the execution and stop of a transaction by starting, committing, and rolling back. From the application perspective, a transaction usually corresponds to a

Winform package deployment and winform deployment 1. Use the package tool provided by VS to create a winform installation project. Development Environment: VS 2008 Access Operating System: Windows XP Development language: C #  Step 1: Open the

This article mainly introducesMySQL transactionThe following describes some operation examples and precautions. Transaction Features: Atomicity (Atomicity) Consistency (stability, Consistency) Isolation (Isolation)

Oracle study note (4) Foreign key-create table major_ning (mid number (2) primary key, mname varchar2 (30) referenced in the master table (parent table )); -- from the table (sub-table), refer to the create table student_ning (id number (5) primary

MySQL mainly has the following products. We will give a brief introduction to the use of each product. In the future, we will analyze the use of each product in detail (the English content is from the MySQL official website) on the one hand, this

CodeIgniter Framework database transaction processing design flaws and solutions, CodeIgniter framework Cause: In one of our online businesses, using older versions of the CodeIgniter framework, there is a design flaw in the DB Class for the DB

A transaction is a series of steps in a logical unit of work. Transactions are used to ensure the security of data operations. Transaction Features: Atomicity(Atomicity) Consistency(Stability,Consistency) Isolation(Isolation) Durability(Reliability)

MySQL (14) ---------- transaction processing, mysql ---------- The previous article's blog on transaction processing was not clearly written, difficult to read, and difficult to understand. So I have organized some documents to help me understand.

Test your understanding of MySQL transactions and isolation levels. I have written an article titled MySQL InnoDB Transaction isolation level and dirty read, Repeatable read, phantom

In actual Sybase ASE applications, especially in ASE + J2EE applications, set chained command not allowed within multi-statement transaction is easy to appear. (although ASE does not support the exception mechanism until version 15.0.1, This article

The cursor select operation will not perform any lock settings on the row being processed, so that other sessions connected to the database can change the selected data, using the for update clause, A mutex lock is added to the corresponding row of

This course is a part of the Oracle Advanced Course, which is slightly theoretical, but closely related to database program development, management, and optimization. In addition, part of this course has been covered in the previous chapter, pay

1. Introduction to data engines InMySQL5.1, MySQL AB introduced a new plug-in storage engine architecture, allowing the storage engine to be loaded into the new MySQL server being migrated. Use the MySQL plug-in storage engine architecture to

This article mainly introduces Mysql database performance optimization 2. if you need it, you can refer to the previous article to introduce mysql database performance optimization 1, today, I will continue my previous article to introduce you to

I. Usage of autonomous transactions Audit that cannot be rolled back: Generally, when a trigger is used to prohibit operations such as table updates, if logs are recorded, the trigger will cause log rollback when an exception is thrown. Autonomous