Troubleshooting problems with high redis cpu occupancy

the occupation of an online redis CPU is relatively high. How to troubleshoot this?
redis users provide PHP scripts to obtain data, and PHP processes data

Mar.11,2021
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-64f5-1bdbfb1-312a9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bdbfb1-312a9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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