The problem of low hit rate of redis query

use redis to store thermal data in the project. In the process of frequent reading, there are often read failures. The hit rate is just over 30%. Especially after reading frequently for a period of time, the hit rate is particularly low. Excuse me, what is the cause of this problem? How to optimize.

Jul.08,2022

same computer room? How many concurrent reads


workerman has video tutorials, which is pretty good. Web site: https://study.163.com/course/...

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-64f5-1b2bd9d-2bac5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2bd9d-2bac5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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