autocommit

In a database, a transaction is a series of operations performed as a single logical unit of work. Transaction operations: First define the start of a transaction, and then modify the data, if committed, these changes are permanently saved if the

The original address "Using transactions", nothing self-yy translation Transaction? A transaction is a single execution unit that consists of one or more statements, or it is all executed successfully, otherwise it is not executed.

There are two main ways in which MySQL transactions are handled: 1, with Begin,rollback,commit to achieveBegin a transactionROLLBACK TRANSACTION RollbackCOMMIT TRANSACTION Acknowledgement2, directly with set to change the MySQL automatic submission

As a DBA, careful, calm is the primary basic quality. However, there will always be a distraction or the development of the students in the wrong operation and so on ... This simulates a false update operation and then resumes.If the development of

Look at a SQL first, the last SQL output what do you think it is?SET autocommit = 1; Begin;insert into T1 VALUES (1); CREATE TABLE T2 (PK int primary key); INSERT into T2 VALUES (2); ROLLBACK; SHOW TABLES;The answer is: T1, t2 all exist!Mysql> Show

Recently I feel that my skills are learning with the work, there is always some knowledge is not mastered, is prepared based on the "MySQL Authoritative guide" and "high-performance MySQL," The two books to systematically learn, each study of the

1.AUTOCOMMITMySQL uses default autocommit and can be viewed and modified by the following commands:mysql> SHOW VARIABLES like ' autocommit ';+---------------+-------+| variable_name | Value |+---------------+-------+| autocommit | On |+--------------

Insert statement Syntax: insert into table [(column1, column2. ..)] values (value1, value2 ...); Note: An insert statement can insert only one record to a table at a time. When you list the default field names, you should explicitly set new values

Why does the database require ImplictCommit (implicit commit of transactions) First look at an SQL statement. What do you think is the output of the last SQL statement? SET AUTOCOMMIT = 1;BEGIN;INSERT INTO t1 VALUES (1);CREATE TABLE t2 (pk int

Transaction processing is a very good feature in mysql. For example, if you do not use Transaction Processing When deleting a large amount of data, some deletion failures may lead to incomplete data. If you use transaction processing, such problems

Insert statement Syntax: insertintotable [(column1, column2. ..)] values (value1, value2...); Description: The insert statement can only insert one record to the table at a time. When the default field name list is used, you should explicitly set a

My friend asked me that the execution of a simple update statement failed. The symptoms are as follows:Mysql> Update order_info set province_id = 15, city_id = 1667 where order_from = 10 and order_out_sn = '1401_1241xx ';Error 1205 (hy000): Lock

Autocommit = {0 | 1} sets whether MySQL transactions are automatically committed. 1 indicates immediate submission, and 0 indicates explicit submission. Global or session is a dynamic variable that can be used in the configuration file (but not in

ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction, hy000restarting My friend asked me that the execution of a simple update statement failed. The symptoms are as follows:Mysql> update order_info set province_id = 15, city_id

Few people use Spring instead of Spring Transaction Manager applications. Therefore, some people often ask: if Spring is used, you must use Spring Transaction Manager, otherwise, what about data persistence? What is the relationship between the

Analysis of Mysql data Rollback Error solution bitsCN.com This section describes how to solve Mysql data rollback errors. For more information, see MYSQL transaction processingThere are two main methods.1. Use begin, rollback, and commit to

The recent accidental discovery before the pessimistic lock optimistic lock understanding is wrong, so re-study a bit.1. Pessimistic lockPessimistic lock Introduction (encyclopedia):Pessimistic locking, as its name implies, is a conservative

Video View Address: Http://edu.51cto.com/course/14674.html?source=so1. Dynamic sql1.1, ifRequirements: Query All users, if the user filled out the name, by the name of the fuzzy query, if the user filled out the name and age, then by name and age

How to write PHP transactions? How to write PHP & nbsp; transactions? & Nbsp; I am an update. the insert code is as follows. the error is that the value type is incorrect and the transaction does not work. $ db & nbsp ;=& nbsp; new & nbsp; DbManager

A. transaction consists of four basic features: for short, acid:1. Atomic (atomicity): All successful or all failed;2. Consistency (consistency): Only valid data can be written, the rule of law rollback to the original state;3. Isolation (Isolation)