这是非常典型的开发场景：在一台笔记本上同时启动 3～5 台 CentOS 虚拟机模拟集群（如 Hadoop、K8S、MySQL 主从等），每台虚拟机默认启动的 GNOME/KDE 桌面会占用大量内存与 CPU。关闭图形界面后，每台虚拟机只保留 Shell 命令行环境，资源占用大幅下降，集群可以跑得更稳、更多。

本内容遵循CC 4.0 BY-SA版权协议 本文详细介绍了MySQL中的数值型、字符串、日期时间、特殊函数，包括ABS、SQRT、MOD等基础数学运算，以及字符串处理的CONCAT、SUBSTRING、DATE_FORMAT等，还有日期时间函数如DATEDIFF和TIMESTAMPDIFF，以及实用的ELT、GROUP_CONCAT和类型转换函数。

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