MySQL

Remove already installed version Yum List installed mysql[[email protected] ~]# Yum list installed mysqlloaded plugins:fastestmirror, refres H-packagekit, securityloading mirror speeds from cached hostfile* base:mirrors.cn99.com* extras:mirrors.cn99.

Tag: The null safe parameter applies EFI profile log zlib so5 ways to install MySQL:1, yum/rpm installation (suitable for the requirements are not high, concurrency is not big, the company internal, some application scenarios within the enterprise)2.

Brief introductionConcept of the 1 view2 · Create a view3 • Working with views Concept of the 1 viewWhat is a view, let's give an example: A boss want to understand a few warehouse specific information, want to know how many of the

1. Modify Login SettingsVIM/ETC/MY.CNF #或/etc/mysql/my.cnf [mysqld] Skip-grant-tables #新加2. Restart MySQL Service3, direct MySQL login, and change the passwordUpdate mysql.user set authentication_string=password (' new password ')  where user= '

Tag: Equals tab div Create specifies charset size fixed codeThe relationship between character and Byte and encodingASCII code, an English letter (not case) occupies a byte of space, a Chinese character occupies two bytes of space. A binary number

Background NotesThe company's entire e-commerce system is built on the Huawei Cloud, according to Mister Estimates, the online 3 months after the daily order volume will reach millions, conservative estimate 3 months after the total number of orders

Hash index structure of the particularity, its retrieval efficiency is very high, index retrieval can be located at once, unlike B-tree index need from the root node to the side point, and finally access to the page node so many IO access, so the

Problem: Slave cannot start after changing relay log directory 2018-08-03t02:53:36.172465z 0 [ERROR] Failed to open the relay log './mysql03-relay-bin.000018 ' (relay_log_ POS 9680848). 2018-08-03t02:53:36.172515z 0 [ERROR] Could not find target

Apache version: 2.2.27MySQL version: 5.5.54-linux2.6-x86_64PHP version: 5.3.27First, source code installation Apache1. First install the Upload tool2, upload the lamp environment required installation package3. Unzip all installation packages4.

Why use incremental backups?There are two ways to fully backup, one is to use tar to package the data file, and the other is to use mysqldump for a full backup. The problem with a full backup is easy to see, every time the data content is backed up,

D:Go to D drive.Scrapy Startproject DoubanCreate a Watercress ProjectCD DoubanEnter ProjectScrapy Genspider Douban_spider movie.douban.comCreating crawlersEdit items.py:#-*-Coding:utf-8-*-# Define Here the models for your scraped items## See

Python generates model from a database tableLooking for a long time to find this, I am a novice ...Now has a built database, need to do data analysis based on the original data Web application, I choose Python+tornado, because do not want to write

Directory.... 1Document Format: .... 1I. Introduction to ATLAS and architecture diagram .... 2Two. Experimental environment .... 3Three. Implementation cases .... 31. Directory structure ... 32. Configure MySQL master-slave ... 43. Install the

Problem Description:Requires storage of 13-bit millisecond-level timestamps, formatted as INT (13) in MySQL, overflow, auto-truncated to 2147483647Analysis:If you ask directly the scope of the int type of storage, it must be known, but the addition

Because you used Oracle before, you know that you can lock a table with SELECT * for update. So it is natural to think in MySQL can not adapt to the for update to lock the table.Learn the following referencesBecause the InnoDB preset is Row-level

The reasons for the slow query are many, and the following are common:1, no index or no index (this is the most common problem of slow query, is the defect of program design)2, I/O throughput is small, forming a bottleneck effect.3. No computed

MySQL database itself provides the master-slave replication function can easily achieve multiple automatic data backup, to achieve the expansion of the database. Multiple data backup can not only enhance the security of data, but also can further

In MySQL, use the ID field of the Auto_increment type as the primary key for the table.   The usual practice is through "SELECT Max (ID) from tablename" approach, but obviously this practice needs to consider the concurrency situation, need to in

This article transferred from: http://blog.sina.com.cn/s/blog_4c197d420101fbl9.htmlView the size of all libraries mysql> use information_schema;database changedmysql> select concat (Round (sum (data_length/1024/1024), 2 ), ' MB ') as data  from

First, Pmm-server1. Installing Dockeryum install -y docker-io2. Pull Pmm-server Imagedocker pull percona/pmm-server:latest3. Create a persistence containerdocker create -v /opt/prometheus/data -v /opt/consul-data -v /var/lib/mysql -v