Why is there no problem with the test interface after the project is deployed online, but 405 appears after a few days without any modification?

centos,nginx configures the port. I really want to know the possible cause of this problem. Please ask the seniors to solve the problem

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Apr.09,2021
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-64f5-1b3612b-2bfef.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3612b-2bfef.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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