Redis capacity estimation problem

The

background is to do an activity that uses redis to store some of the user"s data.
is there any good way to accurately estimate the memory usage of redis

Mar.10,2021
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-64f5-1c30905-33d11.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1c30905-33d11.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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