Nginx+apache, modifies apache's httpd-mpm.conf module, cpu100%?

< IfModule mpm_prefork_module >

StartServers          5
MinSpareServers       5
MaxSpareServers       10
MaxClients            30
MaxRequestsPerChild   0

< / IfModule >

I don"t know why cpu usage is always high. After stopping nginx, cpu drops immediately, and MaxClients is always equal to the number of processes. I don"t know why the maximum number of connections to processes is equal to the number of processes. Ask for help, it is extremely urgent

Mar.10,2021
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-64f5-1b3c32f-2c2fc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3c32f-2c2fc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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