mysql engine

Xin Xing talks about data fragmentation in mysql and operations under MyISAM Engine Data fragmentation in mysql is closely related to data deletion. When deleting data, it will inevitably lead to discontinuous blank space in the data file. for

Since 2012 has been in contact with PHP, until now has been done for two or three years, but also through countless detours, also through the night countless times, read all kinds of PHP books, blogs, and so on, to do a summary, all when it is a

Database trigger details bitsCN. com1 introduction Like the stored procedure, Mysql triggers are embedded into a mysql program. The trigger is a new function of mysql5. Currently, the online Fengchao system, Beidou system, and Columbus system use

Abstract: This article describes how to initiate a mysql Query request from the PHP layer to the result set returned by mysqlserver, and briefly describes the actions and components that may be involved in each layer. Grasp the entire interaction

One day, O & M suddenly said that the channel page interface of the wireless terminal had a large amount of traffic, and the memcache cache could not handle it. as a result, the mysql concurrent query volume was too large, causing the server to go

21 best practices for MySQL Performance Optimization bitsCN.com Today, database operations are increasingly becoming the performance bottleneck of the entire application, especially for Web applications. Concerning the database performance, this is

MySQL discrete notes-foreign key Mysql foreign key References: about MySQL foreign keys and mysql foreign key association creation MySQL has the same definition of "key" and "index", so foreign keys and primary keys are also an index. The

The binlog pre-allocation mentioned is implemented. Based on percoan5.5.18, worklog claims a 10-fold tps improvement in sync_binlog1. When no group The binlog pre-allocation is implemented. Based on percoan5.5.18, the tps is increased by 10 times in

In mysql databases, Index building is also a learning. In a table, the index is not the more the better, but the most important thing for your business. When creating an index, we should consider the following points. 1. The smaller the index Field,

Spring thing configuration generally no problem,First check whether the MySQL engine is InnoDB,Yes, check if there is a problem with the package scan.I just failed the @transactional because of the scanning of the package.The specific situation is

Considerations for innodb database backup (solution caused by phpmyadmin) phpmyadmin BitsCN.com Because the default mysql engine is innodb, no engine is specified when phpmyadmin creates a table, that is, the default innodb is used. this engine is

Recently, sysbench has been used for many performance tests. It also summarizes its features and usage and precautions. Sysbench is a multi-thread performance testing tool. Recently, sysbench has been used for many performance tests. It also

Although MySQL is one of the most popular programs, many developers think it is necessary to split it into other projects, and each branch project has its own expertise. This requirement, Although MySQL is one of the most popular programs, many

Outline: I. Overview 2. What is performance tuning? (What) 3. Why performance optimization? (Why) 4. When do I need performance optimization? (When) 5. Where do I need performance tuning? (Where) 6. Who will perform performance optimization? (WHO) 7.

When using MySQL, the following error occurs: (errcode: 24) "out of resources when opening file. /xxx. MYD "and (error: 24)" can't creat file. /xx. FRM ", found information, the reason is that the number of opened files exceeds the limit on the

I think there may be more than one reason for this problem, so I have collected some online friends to solve this problem for your reference. I hope you can help me. I, 1. Open the my. ini file, find the line default-storage-engine = InnoDB, and

Three major MySQL engines: InnoDB, MyISAM, and Memory InnoDB and MyISAM are the two most commonly used table types in MySQL, each with its own advantages and disadvantages, depending on the specific application. The basic difference is that

Install and basic settings of sphinxWhat is sphinx? If you still don't know, put it on your dog...A simple reference to the official Wiki article: Sphinx is an SQL-based full-text search engine that can be used in combination with MySQL and

This article describes the installation method of the source code tarball, not the RPM installation method. To later use sphinx, install the MySQL sphinx engine during installation. Find the MySQL source code download from the MySQL official

References: About MySQL Foreign keys and MySQL foreign key Association Creation MySQL has the same definition of "key" and "Index", so foreign keys and primary keys are also an index. The difference is thatMySQL automatically indexes the primary