Why do I set the isolation level of the database and still produce dirty read data when I call the method to update the system prompt?

Mar.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-64f5-1b9c9e0-2f322.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b9c9e0-2f322.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?