tristaZero commented on issue #8734:
URL: https://github.com/apache/shardingsphere/issues/8734#issuecomment-751656380


   I guess the following description in [1] is what you are looking for.
   
   ```
   Broadcast Table
   
   It refers to tables that exist in all sharding database sources. Their 
structures and data are the same in each database. It can be applied to the 
small data volume scenario that needs to correlate with big data volume tables 
to query, dictionary table for example.
   ```
   
   
[1]https://shardingsphere.apache.org/document/current/en/features/sharding/concept/sql/
   


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