MySQL

Error_reporting (E_all^e_deprecated^e_notice);Header ("Content-type:text/html;charset=utf8");mysql_connect ("localhost", "root", "") or Die ("database connection failed");mysql_select_db ("Lidepeng") or Die ("Database selection failed");if ($_post['

Because of the need for business logic, row locks must be added to one or more rows of the data table, for the simplest example, the book borrowing system: Suppose Id=1 's book is in stock at 1, but there are 2 people who come to borrow the book at

ObjectiveUse MySQL proxy and MySQL replication for read-write separation mysql Replication You can distribute master data replication across multiple slave, and then use slave to share the read pressure of master. For foreground applications, it

1. Introduction SQL statements need to be compiled and executed at the time of execution, while stored procedures (Stored Procedure) are set of SQL statements to complete a particular function and are stored in the database after compilation. The

A) Backup classification 123456789101112 冷备：cold backup数据必须下线后备份温备：warm backup全局施加共享锁，只能读，不能写热备：hot backup数据不离线，读写都能正常进行备份的数据集完全备份：full backup部分备份：partial backup备份时的接口（是直接备份数据文件还是通过mysql服务器导出数据）物理备份：直接复制（归档）数据文件的备份方式：physical

A How to reset the root password after forgetting the root password of MySQL1. Edit the MySQL configuration file:In the Windows environment:%mysql_installdir%\my.ini//mysql The My.ini configuration file under the installation directory.Linux

In the Apache, PHP, MySQL architecture, MySQL has the greatest impact on performance and is a key core. For the discuz! Forum program is also the case, MySQL settings are reasonable optimization, directly affect the speed and capacity of the forum!

thread_cache_size function in the MySQL database configuration file is a very important feature, if the Thread_cache_size optimization is done well we can let the server run very fast, the settings are not good will find a very small amount of

1.Access denied for user ' root ' @ ' Desktop-an72kei ' (using Password:yes)This problem occurs because MySQL's own user root is theoretically not allowed to access, only local access, if you need to access the user, you need to modify some of the

---query today's recordsSELECT * from WMACC. ' Cash_trade_record ' WHERE to_days (create_date) = To_days (now ());SELECT * from WMACC. ' Cash_trade_record ' WHERE date_format (create_date, '%y%m%d ') = Date_format (Curdate (), '%y%m%d ');---query

I. Data type-related issues 1, varchar (N) How much space is occupied(1) The N in varchar (n) is the number of characters, not the number of bytes;(2) Character type (varchar text blob, etc.) space = character actual length + field length;(3) The

SQL Structured Query Language (Structured query statement)Contains fields and records.A library of multiple data tablesSteps to build a E-r diagram:1. Establish a table for each entity;2. Select a primary key for each table;3. Increase the foreign

First, why partition?Requirements: Big Data. Solution: Divide and conquer, the finer point is. Dividing large tables and large indexes into smaller operations unitsIn MySQL, partitioning allows tables, indexes, and index orchestration tables to be

Chapter One: Data types and operational data sheetsspecification for MySQL statements(1): Keywords and function names all uppercase(2): Database name, table name, field name all lowercase(3): SQL statement must end with a semicolon1: Command-line

Mysql index types and advantages and disadvantages IndexIt is a special file (the index on the InnoDB data table is an integral part of the tablespace) that contains reference pointers to all records in the data table.Note:[1] indexing is not

Mysql 5.7.11 winx64 installation and configuration tutorial, 5.7.11winx64 This document uses mysql5.7.11as an example to describe how to install mysql5.7.zip in windows. I. Prerequisites: 1. win Administrator 2. MySQL installation package (zip

Latest MySQL database vulnerabilities and mysql reports Recently, the Internet disclosed about the existence of MySQL database Code Execution Vulnerability (CNNVD-201609-183. Due to some defects in the default configuration of the MySQL database,

How to solve Chinese garbled characters when MySQL imports SQL scripts from command lines? This example describes how to solve Chinese garbled characters when MySQL imports SQL scripts from a command line. We will share this with you for your

Centos6.5 compile and install mysql 5.6.16 detailed tutorial, centos6.55.6.16 I. Preparations before MySQL compilation and Installation Install the tools and libraries required for compiling source codeYum install gcc-c ++ ncurses-devel perl Install

Mysql security upgrade from 5.6.14 to mysql5.6.25, 5.6.14mysql5.6.25 Mysql versions on the server are: community edition mysql-community-server-5.6.14. Recently, the Bureau scanned the server for vulnerabilities and found that mysql on zhyh08 had