Blocking problems caused by reverse proxy of apache

problem description

I have found that agents configured through apache will affect the speed of other agents if there is a problem at one of the sites and the response is very slow, which is incomprehensible. Is the reverse proxy of apache a single process, single thread?

the platform version of the problem and what methods you have tried

related codes

/ / Please paste the code text below (do not replace the code with pictures)

what result do you expect? What is the error message actually seen?

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-64f5-1b32627-2b660.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b32627-2b660.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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