mysql select and update

1. Full backup and incremental backup 1.1 full-scale backupFull-volume data is all the data in the database, and a full backup is the backup of all the data in the database.Back Up all libraries:mysqldump -uroot -p123456 -S /data/3306/mysql.sock -F -

Select for Update/lock in share mode affects transactional concurrencyconcurrency understanding of transactionsTransactional concurrency, a cursory understanding of the number of transactions that can be performed per unit of time, is a common 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

1. download MySql 1. download MySql Open http://www.mysql.com/downloads/mysql/#downloads download in browser My downloaded version is Red Hat 5 version of http://www.mysql.com/downloads/mirror.php? Id = 407552 Upload the file to the server, or

Henan College of Traditional Chinese Medicine Course Design Report of MySQL Database Management  Title: Research and Implementation of MySQL Clusters       Completion date:2012January 1, December 31   Contents 1. Course Design overview 3 2. research

Select ... The syntax for the FOR UPDATE statement is the same as the SELECT statement, except that the for UPDATE [NOWAIT] clause is appended to the SELECT statement.The statement is used to lock a specific row, if there is a WHERE clause, which

Recent projects, as it relates to the use of optimistic and pessimistic locks in MySQL data, summarize the knowledge of optimistic and pessimistic locks in conjunction with project and online knowledge points.Pessimistic Lock IntroductionPessimistic

MySQL常用指令，java，php程序员，数据库工程师必备。程序员小冰常用资料整理MySQL common commands (for reference)The most common display commands are:1. Display the list of databases.show databases;2. Display the data table in the library:Use MySQL;Show tables;3, display the

MySQL has become one of the most widely used databases on the network, especially for Web applications. it occupies the absolute advantage of small and medium applications. All of this comes from its small and easy-to-use, secure and effective, open

MySQL, the default is auto-commit, that is , autocommit = 1; But in this case, there are problems in some situations: for example:If you want to insert 1000 data at a time,MySQL will commit1000, If we turn off the autocommit [autocommit = 0],