表结构:
CREATE TABLE `instance` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT, `timestamp` int(10) unsigned DEFAULT NULL, `cpu` decimal(8,3) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB;
统计每半小时平均值,实现可以如下:
select `timestamp`-`timestamp`% (5*60) , avg(cup) from `instance` group by `timestamp`-`timestamp`% (5*60)
另外还有:
SELECT queueName, HOUR(dt) AS h, FLOOR(MINUTE(dt) / 30) AS v , avg(memoryUsed), sum(memoryUsed), count(memoryUsed) from queue_resource where dt>='2014-04-14 00:00:00' GROUP BY h, v, queueName;
每个人都需要一台速度更快、更稳定的 PC。随着时间的推移,垃圾文件、旧注册表数据和不必要的后台进程会占用资源并降低性能。幸运的是,许多工具可以让 Windows 保持平稳运行。
Copyright 2014-2025 https://www.php.cn/ All Rights Reserved | php.cn | 湘ICP备2023035733号