MySQL

MAC OS X-Reset MySQL Root passwordHave you forgotten the root password of MySQL for Mac OS? You can reset your new password by following 4 steps:1. Stop MySQL server. Usually in ' System Preferences ' > MySQL > ' Stop mysql Server '2. Open the

1.INTMySQL supports integer types in 5 , and each integer type can be divided into signed and unsigned integers. Type Number of bytes TINYINT 1 SMALLINT 2 Mediumint 3

first, have the original MYQL of the Root the password;Method One:Outside the MySQL system, use the Mysqladmin# mysqladmin-u root-p Password "test123"Enter Password: "Enter the original password"Method Two:By logging into the MySQL system,mysql> use

1. Aggregation functions (Aggregate function)MySQL (5.7) the list of aggregate functions given in the official documentation (image) is as follows:Click https://dev.mysql.com/doc/refman/5.7/en/group-by-functions.html for details.Unless otherwise

The MySQL default mode of operation is autocommit auto-commit mode. This means that unless a transaction is explicitly started, each query is executed automatically as a separate transaction. We can change whether the autocommit mode is

Original: xtrabackup backup restore MySQL DatabaseMysqldump Backup In view of some of its own characteristics (lock table, essentially back up the insert script or text, does not support differential backup), is not suitable for high-real-time

Five optimization techniques1. Query reuse refers to the use of the previous execution results as far as possible, in order to save the query calculation of the whole process of time and reduce resource consumption. At present, the query reuse

Preface:Always want to know how a SQL statement is executed, the order in which it executes, and then review the summary of the information, there is the following blog post. This article explores the knowledge from the MySQL overall architecture--->

MySQL database design, which, for Data performance optimization, field type considerations are important, collected some information, organized to share, this is about the MySQL integer bigint, int, mediumint, smallint and tinyint syntax

**************************************MYSQL Use of views view : Create, modify, delete ***************************************1. MYSQL Build ViewCreating a view is similar to creating a table syntax, unlike creating a view that is created from a

Use MySQL's own function to be cautious, say that it will affect the efficiency of data execution, the cost is too high. This also to distinguish between the reference category of fast software, such as the internal system business logic is more

1, first put aside Mycat to deal with2. When querying a table, specify which database to be, and then query.①, if the MySQL Workbench is used first, use TableName, and then execute the action statement, or specify the database select * from

By default, MySQL will keep the mysql-bin file, so that at some point, the disk may be full, whether it is possible to delete these files, whether it can be safely deleted, is a problem.First of all, these files are MySQL log files, if not the

This error occurs because the port number is not 3306.Open the D:\Program files\mysql\mysql Server 5.5 \my.ini file, and, of course, other. ini files:[Client]port=3306[MySQL]Default-character-set=utf8# SERVER Section# --------------------------------

About MySQL DatabaseMySQL is a relational database management system developed by the Swedish MySQL AB company and is currently part of Oracle's product portfolio. MySQL's most popular relational database management system, MySQL is the best RDBMS

First, mathematical functionsABS (x) returns the absolute value of XBIN (x) returns the binary of X (Oct returns octal, HEX returns hex)CEILING (x) returns the smallest integer value greater than XEXP (x) return value E (base of natural logarithm) x

Treatment scenarios:1, first connect to the MySQL database with localhost, and then use MySQL's own database MySQL;Use MySQL;2. Execution: Select host from user where user = ' root '; found that the value of host is localhost.So get rid of its value:

MySQL slow query log and MySQL Log MySQL has a log called slow query log, which is mainly used to record time-consuming query operations.   . Through this log, we can analyze which operations affect performance, and we need   Some optimization

The difference between using index and using where using index in the MySQL execution plan extra is as follows:   Source: http://www.cnblogs.com/wy123/p/7366486.html(The Source retained is not the right of original works. My work is far from

How to Use the MySQL EntityFramework component to process MYSQL PaaS DB, MySQL Database on Azure is a MySQL cloud Database Service launched on the Azure platform. It is fully compatible with the MySQL protocol, it provides a fully managed database