Linux
MySQLD 正在使用 175% 的 cpu
在其中一台伺服器上，我將 mysqld 作為從屬數據庫執行。
mysqld 目前使用的 CPU 使用率為 175%。
這是 SHOW PROCESSLIST 的結果；
+----------+-------------+-----------+---------+---------+---------+-----------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------+ | Id | User | Host | db | Command | Time | State | Info | +----------+-------------+-----------+---------+---------+---------+-----------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------+ | 109029 | system user | | NULL | Connect | 2346123 | Waiting for master to send event | NULL | | 109030 | system user | | NULL | Connect | 0 | Slave has read all relay log; waiting for the slave I/O thread to update it | NULL | | 12944426 | root | localhost | NULL | Query | 0 | NULL | SHOW PROCESSLIST | | 12944443 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944445 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944463 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944466 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944467 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944469 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944470 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944471 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944476 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944479 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944482 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944484 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944485 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944488 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944490 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944491 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944492 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944493 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944495 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944496 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944498 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944499 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944501 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944502 | mdpipub | localhost | mdpipub | Query | 0 | Sending data | SELECT DISTINCT(article_id) FROM authors WHERE CONCAT( firstname, | | 12944503 | mdpipub | localhost | mdpipub | Sleep | 0 | | NULL | | 12944504 | mdpipub | localhost | mdpipub | Query | 0 | Sending data | SELECT DISTINCT(article_id) FROM authors WHERE CONCAT( firstname, | +----------+-------------+-----------+---------+---------+---------+-----------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------+
我資助這個問題。有人在網站上不斷執行搜尋功能，我對伺服器進行了攻擊。我剛剛禁止了這個IP，目前還可以。
這是因為 2 個潛在的繁重 SELECT 查詢正在執行。然後將所有執行緒的負載匯總到主程序中，並可能顯示超過 100%。