Ubuntu24.04安装好Mysql8后，检查mysql占用的内存和磁盘

检查磁盘使用情况

1. 查看MySQL数据目录大小

查看MySQL数据目录：

bash

sudo du -sh /var/lib/mysql

查看详细的目录结构大小：

bash

sudo du -h --max-depth=1 /var/lib/mysql

查看磁盘总体使用情况：

bash

df -h

2. 在MySQL内部查看数据库大小

查看所有数据库的大小：

sql

SELECT table_schema AS 'Database',ROUND(SUM(data_length + index_length) / 1024 / 1024, 2) AS 'Size (MB)'
FROM information_schema.tables 
GROUP BY table_schema
ORDER BY SUM(data_length + index_length) DESC;

查看具体表的大小：

sql

SELECT table_name AS 'Table',ROUND((data_length / 1024 / 1024), 2) AS 'Data Size (MB)',ROUND((index_length / 1024 / 1024), 2) AS 'Index Size (MB)',ROUND(((data_length + index_length) / 1024 / 1024), 2) AS 'Total Size (MB)'
FROM information_schema.tables
WHERE table_schema = 'your_database_name'
ORDER BY (data_length + index_length) DESC;

查看二进制日志大小：

sql

SHOW BINARY LOGS;

使用监控脚本

创建监控脚本

内存监控脚本：

bash

#!/bin/bash
# mysql_memory_monitor.shecho "=== MySQL Memory Usage ==="
echo "System Memory:"
free -hecho -e "\nMySQL Process Memory:"
ps aux | grep mysql | grep -v grep | awk '{print "PID: "$2", MEM: "$4"%, VSZ: "$5", RSS: "$6}'echo -e "\nMySQL Buffer Pool Usage:"
mysql -u root -p -e "
SHOW VARIABLES LIKE 'innodb_buffer_pool_size';
SHOW STATUS LIKE 'Innodb_buffer_pool_pages%';
" 2>/dev/null

磁盘监控脚本：

bash

#!/bin/bash
# mysql_disk_monitor.shecho "=== MySQL Disk Usage ==="
echo "Data Directory Size:"
sudo du -sh /var/lib/mysqlecho -e "\nDisk Space:"
df -h /var/lib/mysqlecho -e "\nDatabase Sizes:"
mysql -u root -p -e "
SELECT table_schema AS 'Database',ROUND(SUM(data_length + index_length) / 1024 / 1024, 2) AS 'Size (MB)'
FROM information_schema.tables 
GROUP BY table_schema
ORDER BY SUM(data_length + index_length) DESC;
" 2>/dev/null

使用专业监控工具

安装和使用mytop

bash

sudo apt install mytop
mytop -u root -p

使用MySQL Workbench

• 下载并安装MySQL Workbench

• 连接到MySQL服务器

• 使用性能仪表板查看详细指标

关键指标解读

内存相关：

• innodb_buffer_pool_size: InnoDB缓冲池大小

• key_buffer_size: MyISAM键缓冲大小

• query_cache_size: 查询缓存大小

磁盘相关：

• 数据文件: /var/lib/mysql/ibdata1

• 日志文件: /var/lib/mysql/ib_logfile*

• 二进制日志: /var/lib/mysql/binlog.*

定期清理（如果需要）

清理二进制日志：

sql

PURGE BINARY LOGS BEFORE NOW() - INTERVAL 7 DAY;

优化表：

sql

OPTIMIZE TABLE table_name;

这些方法可以帮助你全面了解MySQL在Ubuntu 24.04上的内存和磁盘使用情况。