LeeGuoPing commented on pull request #11540:
URL: https://github.com/apache/shardingsphere/pull/11540#issuecomment-893310528


   @strongduanmu When I use unit test` GeneralDQLIT assertExecute`. Sometimes, 
it has a exception` Connection is not available, request timed out after 
30006ms.`  Sometimes it run right.  I debug the connection pool of H2 , find 
H2's max connections is two. Then one connection wait time out, Do you met this 
problems before?
   
   
   ```
   <test-case sql="SELECT o.*, i.* FROM t_order_federate o, 
t_order_item_federate i WHERE o.order_id = ? AND i.item_id = ?" 
scenario-types="db,dbtbl_with_readwrite_splitting,dbtbl_with_readwrite_splitting_and_encrypt">
           <assertion parameters="1000:int, 100000:int" 
expected-data-file="select_across_single_tables_with_federate.xml" />
       </test-case>
   
       <test-case sql="select t_order_federate.*, 
t_order_item_federate_sharding.* from 
t_order_federate,t_order_item_federate_sharding where t_order_federate.order_id 
= t_order_item_federate_sharding.item_id" 
scenario-types="db,dbtbl_with_readwrite_splitting,dbtbl_with_readwrite_splitting_and_encrypt">
           <assertion 
expected-data-file="select_sql_by_id_across_single_and_sharding_tables.xml" />
       </test-case>
   
       <test-case sql="select t_order_federate.*, 
t_order_item_federate_sharding.* from t_order_federate, 
t_order_item_federate_sharding where t_order_federate.order_id = 
t_order_item_federate_sharding.item_id AND 
t_order_item_federate_sharding.order_id = ?" 
scenario-types="db,dbtbl_with_readwrite_splitting,dbtbl_with_readwrite_splitting_and_encrypt">
           <assertion parameters="10001:int" 
expected-data-file="select_sql_by_id_across_single_and_sharding_tables_order_id.xml"
 />
       </test-case>
   ```


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