[GitHub] [incubator-shardingsphere] kimmking edited a comment on issue #4341: shardingsphere 4.0.0 retrive very slow that sql script

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kimmking edited a comment on issue #4341: shardingsphere  4.0.0 retrive very slow that sql script
URL: https://github.com/apache/incubator-shardingsphere/issues/4341#issuecomment-587377554
 
 
   @ancientelves 
   After discuss with @terrymanu , I find the key point about this issue.
   The parameter `max.connections.size.per.query` in `server.yaml` is 1 by default. This means 16 sub query to each table one by one via a same connection.
   In my case, the cost is 250ms by proxy sharding, and came down to 90ms by set the parameter to 8, better than only one table.
   
   And a tip here : don't modify this parameter to a higher value in your production env, cause it maybe    exhausted your jdbc connections in datasource pool. 

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