RaigorJiang commented on issue #21615:
URL: 
https://github.com/apache/shardingsphere/issues/21615#issuecomment-1283347823

   > @RaigorJiang
   > 
   > connect use mysql 8 client workbench success with proxy account testacc_a: 
[success_testacc_a_workbench_mysql8.log](https://github.com/apache/shardingsphere/files/9808471/success_testacc_a_workbench_mysql8.log)
   > 
   > connect use mysql 8 client workbench fail with proxy account testacc_b: 
[fail_testacc_b_workbench_mysql8.log](https://github.com/apache/shardingsphere/files/9808629/fail_testacc_b_workbench_mysql8.log)
   > 
   > connect use mysql 8 client navicat success with proxy account testacc_a: 
[success_testacc_a_navicat_mysql8.log](https://github.com/apache/shardingsphere/files/9808485/success_testacc_a_navicat_mysql8.log)
   > 
   > connect use mysql 8 client navicat fail with proxy account testacc_b: 
[fail_testacc_b_navcat_mysql8.log](https://github.com/apache/shardingsphere/files/9808491/fail_testacc_b_navcat_mysql8.log)
   > 
   > different client will have different connect sql, the common issue is 
proxy account would access the database that does not belong to it
   
   @wallacezhou Thanks you, after checking the log, I think it is a bug for 
now. 
   
   The reason is that `DALStatement` uses `UnicastDatabaseBackendHandler`, 
which is used to get a database at random. (containing unauthorized databases). 
   Are you interested in trying to fix this?


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