mysql autocommit status

Relationship between autocommit and SQL rollback in mysql bitsCN.com Relationship between autocommit and SQL rollback in mysql. First, I think this answer should be related to autocommit. First, let me explain the background. The problem is repeated:

Today write a small function, inside to update the database with MYSQLDB, the statement is as followssql = "Update%s.account_operation set Status=1 where username= '%s '"% (allresdbinfos[' db '), username)　　After the variable is replaced, it looks

Performance department colleagues reflect that some of the staff performance in the query can not be displayed, and gave two work number. All of the two work numbers correspond to the normal approval of performance, but the performance management

Recently learned a database of pessimistic lock and optimistic lock, according to their own understanding and online resources summarized as follows:Pessimistic lock Introduction (encyclopedia):Pessimistic locking, as its name implies, is a

Objective In order to ensure consistent integrity of data, there is a locking mechanism in any database. The quality of locking mechanism should be directly thought of the concurrent processing ability and performance of a database system, so the

Concrete Example 1. PHP Server ComponentsFor beginners, it is recommended to use the integrated server component, which already includes PHP, Apache, Mysql and other services, eliminating the time spent by developers in the tedious configuration

Recently learned a database of pessimistic lock and optimistic lock, according to their own understanding and online resources summarized as follows:Pessimistic lock Introduction (encyclopedia):Pessimistic locking, as its name implies, is a

I have a table w1000, there are 10 million data, this table structure is as follows:CREATE TABLE ' w1000 ' (' ID ' varchar ($) Not NULL,' Name ' varchar () DEFAULT NULL,' Age ' int (3) DEFAULT NULL,' Money ' double (8,2) DEFAULT NULL,' Address '

What is a transaction?In the MySQL environment, a transaction is composed of one or more SQL statements as a separate unit. Each SQL statement in this unit is mutually dependent, and the unit as a whole is inseparable. If a statement in a unit

Pessimistic locking, as its name implies, is a conservative attitude to the data being modified by the outside world (including other transactions currently in the system, as well as transactions from external systems), so that the data is locked