After one of your functions is in the production environment, the pressure on the server increases sharply, how to troubleshoot

Hello, everyone. The questions are as follows: 

cpu:
Java production-environment server-performance stress-test
Mar.06,2021

check which processes in the server take up too much cpu, and then see if there is any abnormal access to the log in this service

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e4507d-65119.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e4507d-65119.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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