default null

The InnoDB row format in two formats (compact,redundant) defaults to the compact compact's storage format, and the first part is a non-null, variable-length list of field lengths, and is placed in reverse order, when the length of the column is less

"Backing up single database-Multiple parameters" syntax: Mysqldump-u username-P database name > backup file name"View the character set of a database"Mysql> Show variables like ' character_set% '; +--------------------------+-------------------------

DemandNow there is a demand, MySQL has a table, data growth is very fast, but the data is valid for 1 months, one months ago the record is not very important, but can not be deleted. In order to ensure the query speed of this table, a simple backup

When mysql processes a unique index, it updates the index. If it does not exist, it should be very common to insert the index. There are many similar articles on the Internet, today I will talk about the problems and methods that may occur when this

If mysql processes an index, it is updated. If there is no index, it is inserted (multiple columns of unique indexes). If there is no index, It is very common to insert the index, there are many similar articles on the Internet. Today I will talk

SQL templates created for Mysql databases, tables, character sets, and primary and Foreign keys # If a database with the same name exists, delete the database with the same name.Drop database if exists cfms;# If the cfms database whose

This article mainly introduces a specific case analysis of optimizing MySQL Query operations. it mainly adjusts the use of join fields. For more information, see Problem Description A user reports that the execution time of an SQL statement is too

PowerDNS introduction PowerDNS is a high-performance domain name server. in addition to supporting common BIND configuration files, PowerDNS can also read data from databases such as MySQL, Oracle, and PostgreSQL. PowerDNS is installed with

Oracle10g-Regular Expression For a basic introduction to regular expressions, refer to deep dive regular

Install powerDNS and poweradmin on Centos 1. Installation prerequisites The lamp environment has been installed successfully; 2. Install powerdns # Yum-y install pdns-backend-mysql Connect to mysql: # Mysql-u root-p Create a powerdns database: >

MySQL schema and binary log disk space trend analysis, schemabinary Author: SkateTime: 2015/01/05   Disk Space Trend Analysis of MySQL schema and binary log [Root @ skatedb55 dist] #./mysqlsize -- helpUsage: Database diskspace usage v0.1, (C)

Mysql inserts a Chinese garbled php file and sets the webpage encoding to UTF-8. Header ("Content-type: text/html; charset = utf-8 "); Before the database is inserted, the encoding passed to the database is set to UTF-8. $ This-> mysqli-> query

Purpose: To test the difference between create table A as SELECT * from B and create table a like B MySQL under test: SOURCE table: Ti Table structure is as follows Root:test> Show CREATE TABLE Ti\g 1. Row

InnoDB row format in two formats (compact,redundant) The storage format of the compact Compact is a non-null, variable-length list of field lengths, and is placed in reverse order by column, when the length of the column is less than 255 bytes,

Author:skateTime:2015/01/05MySQL schema and binary log disk space trend analysis[Email protected] dist]#/mysqlsize--helpUsage:database diskspace Usage v0.1, (C) Copyright Skate 2014[-h] [--load load]--dbtype dbtype--cfg cfg--field

1. Create a statement CREATE DATABASE database_name//Creating databasesDelete TableDROP TABLE IF EXISTS ' t_social_user_extend ';//Build tableCREATE TABLE ' t_social_user_extend ' (' id ' bigint (20) not NULL auto_increment, ' user_id ' bigint ()

When the data volume of the database rises to a certain amount, the performance becomes the question which we cannot but pay attention, how optimizes? There are only a few ways to use them: 1, the table, that is, a large number of expression data

When the amount of database data rises to a certain amount, performance becomes the problem that we can't help but how to optimize? There are a few common ways:1, sub-table, that is, a large expression of data into several tables, so that each table

Original address: http://nlp.solutions.asia/?p=180These instructions assume Ubuntu 12.04 and Java 6 or 7 installed and java_home configured.Install MySQL Server and MySQL Client using the Ubuntu Software Center or at the sudo apt-get install

资产管理对于任何公司来说都是件非常重要的事情，大家不用cmdb都有点不好意思出来见人了，上了CMDB之后基础就是资产这块，为了不苦逼似的一个个往里边录入，于是用python 结合Ansible 写了个自动收集资产信息，然后拿出自己需要关注的字段，自动insert 到cmdb 数据库里边去。Our CMDB is open source, and after the front-end customization, the back-end database needs to create