RaigorJiang opened a new issue, #21671:
URL: https://github.com/apache/shardingsphere/issues/21671

   Hi community,
   
   This issue is for #21659.
   
   
   ### Background
   Because the conceptual scope of `RESOURCE` is relatively large, here it 
actually just represents the unit used to store data, so the naming is adjusted.
   
   At the same time, `ADD RESOURCE` does not `ADD` a new db, but register the 
physical db in the logical database for use, so `ADD` is also adjusted to 
`REGISTER`.
   
   ### Aim
   Change keyword `INSTANCE` to `COMPUTE NODE`, e.g.
   ```
   ADD RESOURCE -> REGISTER STORAGE UNIT
   ALTER RESOURCE -> ALTER STORAGE UNIT 
   DROP RESOURCE -> UNREGISTER STORAGE UNIT
   SHOW DATABASE RESOURCES -> SHOW STORAGE UNITS
   SHOW UNUSED RESOURCES -> SHOW STORAGE UNITS WHERE usage_count = 0
   ```


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