MySQL

The following articles mainly describe the practical application and specific operation steps of the extended option in the MySQL EXPLAIN statement. We all know that there is an explain command in the MySQL database, its main function is to analyze

This article mainly describes the list of database MySQL error codes. If you are a beginner in MySQL database learning, this article will be meaningful to you, the following is a detailed description of the main content of the article. I hope you

Many people have asked how to set an auto-increment field in MySQL. The following describes how to set an auto-increment field in MySQL. I hope you can learn more about the MySQL database. Related statements for setting auto-increment fields in

MySQL GUI Tools is a set of graphical desktop application Tools that can be used to manage MySQL servers. The tool package includes three tools: MySQL Query Browser, MySQL Administrator, and MySQL Migration Assistant (only supported on Windows

1. The configuration is enabled.Linux:AddLog-slow-queries =/var/lib/mysql/slowquery. log (specify the location where the log file is stored, which can be empty and the system will give a default file host_name-slow.log)Long_query_time = 2 (the time

In recent months, servers have always been on the machine frequently, leading to unguaranteed availability of the Bill lid. But it is also strange, when the server can be normally connected, Nginx also seems to be normal, but the PHP-FPM lost

Message from server: "Host 'xxx' is not allowed to connect to this MySQL server solution: 1. Change the table method. It may be that your account is not allowed to log on remotely, but only on localhost. At this time, you only need to log on to

MySQL crash: InnoDB redo log error solution InnoDB: Progress in percents: 1120731 9:56:59 InnoDB: Error: page 9 log sequence number 5746244819174 InnoDB: is in the future! Current system log sequence number 5706919300319. innoDB: Your database may

The date and time functions UNIX_TIME () and UNIX_TIMESTAMP () in the MySQL database write code over the past few days. It is used repeatedly to convert the date and time fields into numbers and date format strings, I feel that I am still in the

MYSQL Getting Started: Link to MYSQL command parameters: MYSQL Getting Started: basic operations http://www.bkjia.com/database/201212/173868.htmlMYSQL Entry 2: Search Using Regular Expressions http://www.bkjia.com/database/201212/173869.htmlMYSQL

Note 1 For mysql count distinct null: An example is used to explain the problem. Now another database table is hello. The table content is as follows: www.2cto.com id name 1 Null2 Null3 Null4 Null5 Null hello table has two fields: id and name, name

Warning: prerequisite DBD: mysql 1 not found error solution when using perl-compiled DBD: mysql, the process prompts that the compilation fails, here we want to manually compile the relevant package files; related errors are as follows; www.2cto.com

MySQL manager or server PID file cocould not be found solved # My server hostname, mysql pid file default name is hostname. pid, if not in/etc/my. in cnf, If you specify a specific pid filename and pid file path, this file is associated with mysql

Mysql's collation case-sensitive setting mysql databases are sometimes case-sensitive and sometimes not true when performing queries, mainly because of the setting of mysql character verification rules. Usually, it is not supported by default. After

[MySQL practice] when loading data infile reports ERROR 1148 (42000) or ERROR 1045 (28000, load data infile is a very efficient command, from db1.table1 of host1 Through select... into outfile: import data to a text file, and then import data to db2.

Logical backup: Common Operations, case studies, causes of unexpected termination, and solutions (I) Common Operations ① full-Database Backup Syntax: mysqldump-h host name-P port-u user name-p password (-database) database Name> file name. SQL

Mysql prompts Writing to net to solve the problem. Recently, it found that the cpu usage of a database has been compared. More than 200%. First, check the slow log of the database and set the slow log to 5 seconds. Basically, no daily log is

Function: Example of taking the entire function round and floor in MySQL: round(123.456,2) ------------ 123.47ROUND ( numeric_expression , length [ , function ] )  The numeric_expression parameter is an expression of

Mysql provides a large number of time and date functions, as well as various operations of the date and time functions, such as addition and subtraction operations. If you need them, you can refer to them. 1.1 obtain the current date + time (date +

SQL getting started Tutorial: SQL CREATE INDEX syntax The table used to create the index in the create index statement. Indicators allow database applications to quickly find data without reading the entire table. MetricsThis index can be created