Bingai077 opened a new issue, #20075:
URL: https://github.com/apache/shardingsphere/issues/20075

   Which version of ShardingSphere did you use?
   ghcr.io/apache/shardingsphere-proxy:c9cc117c8f4b42c220f89c92851bf945c40c71b0 
 (helm cluster)
   
   Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
   ShardingSphere-Proxy
   
   Expected behavior
   JDBC connection is normal.
   
   Actual behavior
   java.sql.SQLException: Unknown system variable 'query_cache_size'
   
![image](https://user-images.githubusercontent.com/51192624/184082438-f5cfd40b-d56b-4861-bd8e-892bfabe8133.png)
   
   Environment Configurations
   ```
   props:
     check-duplicate-table-enabled: false
     check-table-metadata-enabled: true
     kernel-executor-size: 16
     max-connections-size-per-query: 1
     proxy-backend-driver-type: JDBC
     proxy-backend-executor-suitable: OLAP
     proxy-backend-query-fetch-size: -1
     proxy-frontend-executor-size: 0
     proxy-frontend-flush-threshold: 128
     proxy-frontend-max-connections: 0
     proxy-hint-enabled: true
     proxy-opentracing-enabled: false
     show-process-list-enabled: false
     sql-federation-enabled: false
     sql-show: true
     proxy-mysql-default-version: 8.0.21
   ```
   My mysql cloud server version is `8.0.21-5` 
   
   I need a little help.
   


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