In order to understand a large number of concurrent visits in large websites, it is far from enough to achieve distributed load balancing in websites. To the data business layer and data access layer, if the traditional data structure is still used, or only one server is used to handle so many database connection operations, th ...
Posted by Mr. Tech on Sun, 12 May 2019 04:31:44 +0200
In production, with the updating of database version or other requirements, it may be necessary to install multiple databases of different versions (or the same version) on one host. (The database here refers to an entire database separated by the database port number, rather than referring to the database in a database, pay ...
Posted by deejay on Sun, 12 May 2019 04:28:22 +0200
MySQL was originally an open source relational database management system developed by Swedish company MySQL AB, which was acquired by Sun Microsystems in 2008. In 2009, Oracle acquired Sunrise Microsystems, and MySQL became Oracle's product.
MySQL has become the most popular open source database in the past because of ...
Posted by sweetstuff2003 on Sat, 11 May 2019 22:52:05 +0200
Recently, I read MariaDB's official website to introduce MariaDB's functions and characteristics, and outlined a few places that I feel it necessary to understand:
Supporting column-level compression
CREATE TABLE `cmp2` (
`id` bigint(20) NOT NULL,
`name` varchar(100) DEFAULT NULL,
PRIMARY KEY (`id`));
Posted by Crystal Dragon on Sat, 11 May 2019 22:26:21 +0200
Return Proxy SQL Series: http://www.cnblogs.com/f-ck-need-u/p/7586194.html
1. Understanding Chain Rules
In the mysql_query_rules table, there are two special fields, "flagIN" and "flagOUT", which are used to define the entry and exit of the rules respectively, so as to realize the chains of rules.
The implementation of ch ...
Posted by pob123 on Sat, 11 May 2019 15:33:54 +0200
This article includes the following contents
Group query: group by
Sort query: order by
Reduplication of query results: distinct
Limit query volume: limit
First, create two tables employee and department:
mysql> select * from employee;
Posted by abigail on Sat, 11 May 2019 10:55:36 +0200
1.linux centos 7 system2. The CD-ROM image file has been mounted3. The system can connect to the external network.4. Font links: https://pan.baidu.com/s/1m9WJys5aGuUi-WgBG-zrxw Extraction code: qq6r
1. Upload font files and zabbix scripts to the Linux system / root directory
Method 1: Mount Method 2: U ...
Posted by sicKo on Sat, 11 May 2019 10:00:42 +0200
The running environment is windows server 2008 64-bit system.
Installation directory D:/wnmp
Mysql 5.7 Download Address: https://dev.mysql.com/downloads/mysql/5.7.html#downloads
(This article chooses 5.7.25 | Microsoft Windows | All | Windows (x86, 64-bit), ZIP Archive)
php7.2 Download Address: https://windows.php.net/downloads/releases/php-7. ...
Posted by cyberlew15 on Sat, 11 May 2019 09:05:31 +0200
I don't know if you have such a feeling. In normal development, there are often many duplicate codes in dao and service classes. Velocity provides template generation tools. Today, I will teach you how to say goodbye to these duplicate codes.
Reference items: https://github.com/bigbeef/cppba-codeTemplatePersonal blog: http://www.zhangb ...
Posted by Tonic-_- on Sat, 11 May 2019 04:37:58 +0200
Configuration of server
II. Configuring Agents
1. Ports are not accessible
2. Active and passive modes of ZABBIX
3. Incorrect alarm time
Configuration of server
First configure the zabbix server side
1. go zabbix official website Choose install zabbix from package mode, and then select ...
Posted by Chris_78 on Fri, 10 May 2019 22:11:02 +0200