MySQL

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The general database design needs to meet the three normal forms, which is the most basic requirements, up to 6NF, but in general, 3NF achieved can beOne: 1NF a paradigm of understanding:1NF is a relational database of the most basic requirements,

This article describes some MySQL SQL statements for querying, including by year, quarter, month, week, day and so on, the need for friends, you can refer to.I. Annual ENQUIRYQuerying data for the yearSELECT *From Blog_articleWHERE year

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[Email protected] log]# pt-query-digest Slowq.log# 200ms User Time, 10ms system time, 24.39M rss, 205.12M vsz# current Date:thu Dec 17 15:32:04 2015# hostname:hank-yoon.com# Files:slowq.log# Overall:8 Total, 2 unique, 0.00 QPS, 0.00x concurrency ____

5.6.26 Source installation package:Http://pan.baidu.com/s/1kUl44WRCMake installation package Link:Http://pan.baidu.com/s/1c0LuwJAOperating system version: CentOS release 6.3 (Final)installation process: (Remember to mount the image and configure Yum

The common MySQL show commands are as follows:1, show databases; Show all databases in MySQL2, show tables [from databases]; Displays the names of all tables in the current database3, Show columns from tables; Displays the names of the columns in

There are three standard loops in a MySQL stored procedure statement: While loop, loop loop, and repeat loop. There is also a non-standard cycle mode: GOTO, but this cycle is best not to use, it is easy to cause confusion of the program, here is a

1 Environmental DescriptionThe first article of the environment "MYCAT Study notes". MYSQL read-write separation and log analysis--master-slave single node http://www.cnblogs.com/kaye0110/p/5134588.htmlAdded a set of MySQL instances, Port 3308,

This article will detail the cause of MySQL garbled and the specific solutionWhy MySQL is garbledTo understand why garbled, we have to understand: from the client initiated the request, to the MySQL storage data, and the next time from the table to

MySQL Common functions1, the database to take yesterday's dateMysql> Select Date_sub (current_date (), Interval 1 day); +-----------------------------------------+| Date_sub (Current_date (), Interval 1 day) |+----------------------------------------

Innotop is a very powerful MySQL monitoring tool, written in Perl, showing the health of MySQL servers and InnoDB in text mode.Installing Innotop: Https://github.com/innotop/innotopThere are two versions available on GitHub, one for the development

Indexes are the basis of efficient use of the database, but when your data volume is very small, perhaps by scanning the whole table to access the performance of the data is acceptable, but when the amount of data is very large, when the traffic is

One, Apache download: http://www.apache.org/Installation: Direct decompression to Apache for the file name on the disk. Locate the drive letter: \apache\conf\httpd.conf file, open with Notepad, find: Define srvroot This entry, its value is

How Mysql limit is optimized correctly 2010-05-17 17:09 Anonymous Blog Parkfont Size:T | T What we are mainly sharing with you today is the description of the contents of the MySQL limit brief introduction and how to optimize it, the following is

Reprinted from: http://blog.chinaunix.net/uid-20639775-id-3254611.htmlMySQL master-Slave synchronization architecture is currently one of the most used database architecture, especially the load is relatively large site, so for master-slave

Comparison and usage of distinct and group by statements in MySQL, mysqldistinct The data table records the bibliography used for user verification. Now I want to retrieve all the bibliography and use DISTINCT and group by to get the expected

Mysql databases are queried by day, yesterday, the first seven days, the last thirty days, the quarter, and the year. mysql databases are queried by thirty days. Today, I spent some time sorting out the code for MySQL to find data for the current

MySQL Proxy installation and basic command usage tutorial, mysqlproxy One of the most powerful features of MySQL Proxy is the end of "Read/Write Splitting )". The principle is to allow the primary database to process transactional queries, but to

How to Use the LIKE clause in MySQL, MySQL LIKE syntaxThe LIKE operator is used in the WHERE expression to search for the specified content in a matching field. The syntax is as follows: WHERE column LIKE patternWHERE column NOT LIKE pattern When