MySQL

MySQL Password lost backSteps1 Stopping the database/etc/init.d/mysqld stop2 Starting the database service with the--skip-grant-tables ignore authorization table/usr/local/mysql/bin/mysqld_safe--skip-grant-tables &3 MySQL Direct access change

Steps to be made for the newly initialized database1 password was set for root2 Deleting the Default user3 Delete the default test libraryWays to change passwords1 set the password for the administrator (start without password)Mysqladmin-uroot

Logical Structure of the 1.mysql:• Tier One: Service layer (for Client services, request connection processing, authorization authentication, security)• Second tier: Core layer (query parsing, parsing, optimization, caching, providing built-in

SQL classificationSQL statements can be divided into 3 categoriesDDL: Data definition language, defining data segments, databases, data tables, and other DML: data manipulation statements for adding, deleting, updating, and querying database records

A database is a warehouse where data is stored and managed, but the database itself cannot store data directly, and data is stored in tables. Storing data is bound to use the database server, that is, a computer is installed on a database management

There are 6 permissions tables in MySQL library under MySQLMysql.userUser fields, permission fields, security fields, resource control fieldsMysql.db, Mysql.hostUser fields, permission fieldsMysql.tables_priv,mysql.columms_priv,mysql.procs_privFirst,

First in the new database must pay attention to generate the original database the same encoding form, if it has been generated can be used phpMyAdmin and other tools to organize again, to prevent the database encoding and table encoding is not

When importing the MySQLdb module, the error is as follows>>> Import MySQLdbTraceback (most recent):File "", line 1, in Importerror:no module named MySQLdbFound a solution on the Internet:Yum Install Mysql-python (CentOS System)Import again when the

MySQL database has a database named MySQL;Yes, it's a bit of a detour, and it's understandable to read it more than two times.The execution show tables; can be found to have so 28 tables under

Stored Procedures???? Store multiple steps to complete a feature to define multiple calls at once.???? is a function that has no return value.Create1th Step: Change Terminator2nd step: Create a process???? CREATE PROCEDURE procedure name ( direction

MySQL operation on a table The concept of a tableRepresents a database object that contains all the data in the database. The database objects in the table contain columns, indexes, triggers. Where triggers are user-defined sets of

Explain execution planAbout MySQL tuning: Find the problem first (slow query, profile) For using indexes and not using indexes, learn that indexes can quickly find data Understanding what an index is (an index is an ordered, fast-looking

reprint: http://blog.163.com/user_zhaopeng/blog/static/166022708201252323942430/Business Scenario:For example, the user table, we need to build a field is the creation time, a field is the update time.The workaround can be to specify the insertion

First, about large file storage1. When using MySQL to store large files, the exceptionAdd the following line to the configuration file2. Restart MySQL after the change, but report the following error:Solution:My MySQL is version 5.6, found online

1. Download and decompress MySQL database  wget http://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.9-linux-glibc2.5-x86_64. TAR.GZSTAR-XVF mysql-5.7.9-linux-glibc2.5-x86_64.tar.gz-c/usr/local/mysql-5.7.9 2. Creating a soft link ln-s mysql-5.7.9

Mysql green version is enabled in windows, mysqlwindows Start mysql Green Edition in windows 1. Download mysql installation-free version such as: mysql-5.7.11-winx64 2, modify the configuration file, my-default.ini name changed to: my. ini, the file

Mysql database index optimization and mysql database index With outstanding performance, low cost, and rich resources, MySQL has become the first choice of relational databases for most Internet companies. Although the performance is outstanding,

Mysql source code compilation and installation and master-slave asynchronous configuration in centos Installation machine: 10.11.1.193 and 10.11.1.194 Master/Slave synchronization mode: asynchronous Synchronization Mysql version: mysql community5.6.2

[Java] operations on the database (including preprocessing in the database)I. connection problems I just introduced how to connect to the database and write the corresponding template, but its maintainability is very poor. How can I solve this

MySQLsql statement optimization (conversion) Optimization objectives1. Reduce IO times I/O is always the easiest bottleneck for databases. This is determined by the database's responsibilities. More than 90% of the time spent in most database