How does redis view the storage space of a db?

for example, how do I check the amount of storage space occupied by db6?

Operation-and-maintenance backend redis
May.13,2022

switch to DB6 (DB starts from 0 by default), and execute INFO MEMORY 

127.0.0.0:6379> select 6
OK
127.0.0.0:6379[6]> INFO MEMORY

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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-64f5-1c1e9e5-3b7c9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1c1e9e5-3b7c9.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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