如果像之前那样标签以逗号分隔保存在 courses 表中,同一个标签如 “frontend” 会多次出现,如果要将这个标签改名为 “front-end” 就会多出很多不必要的锁定操作,修改标签却要锁定 courses 表里的记录,这本身就很不合理,tags 表才该是唯一储存标签的地方,而tags 里的标签条目才是修改标签时唯一应该被锁定的条目 ...
Scale Up,向上扩展,垂直扩展 Scale Out,向外扩展,横向扩展 1.1 MySQL 主从复制 1.1.1 主从复制架构和原理 1.1.1.1 MySQL的主从复制 读写分离 复制:每个节点都有相同的数据集,向外扩展,基于二进制日志的单向复制 1.1.1.2 复制的功用 负载均衡读操作 备份 高可用和故障切换 数据分布 MySQL升级 1.1.1.3 复制架构 ...
_or("192.168.0.113").to_string(); let port = matches.value_of("port").unwrap_or("5662").to_string(); let front = "mysql://pgx:pgx_pwd@".to_string(); let hosts = front + &host + ":" + &port + "/mysql"; let url = hosts.to_string(); // let mut hosts = front + ...
haproxy代理配置:结果图:haproxy代理配置2方式:结果配置:Haproxy的配置文件由两部分组成:全局设定和对代理的设定,共分为五段:global、Default、frontened、backend、listen配置文件格式:HAPROXY的配置处理3类来主要参数来源:---最先处理的命令行参数---“global”配置段,用于设定全局的参数配置---proxy相关配置段,...
Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' forhelp. Type '\c' toclearthe current input statement. mysql> show frontends; ...
Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 9 Server version: 10.4.25-MariaDB MariaDB Server Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input ...
本问主要介绍了FLink CDC分库分表怎么实时同步,并结合Apache Doris Flink Connector最新版本整合的Flink 2PC 和 Doris Stream Load 2PC的机制及整合原理,使用方法等。 希望能给大家带来一点帮助。 8.相关链接: SelectDB 官方网站: https://selectdb.com
Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> show frontends; +---+---+---+---+---+-...
Much attention focuses on front-end development; this is where the HMTL5, CSS, and JavaScript are coded to develop the landing page that everyone sees when they visit your site. But the real magic happens on the backend. This is the ecosystem that really powers your website. One writer ...
Hosting an application or dynamic website requires you to set up a database on the backend to store user’s information. A popular option is MySQL, which is widely used for various projects with different web stacks. To help you get started quicker, this tutorial will guide you through the...