Css and js files cannot be loaded online

the project has been working well online, but recently there has been a very strange phenomenon

clipboard.png

these two files initially display 200 ok and then become failed. I confirmed that these two files exist in the project on the server, and I don"t know why

Mar.07,2021

check access.log and error.log

of Nginx.
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-64f5-1b3518d-2b7b2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3518d-2b7b2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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