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Posted to notifications@iotdb.apache.org by "Yuan Tian (Jira)" <ji...@apache.org> on 2023/02/10 13:24:00 UTC

[jira] [Created] (IOTDB-5522) Last Query performance improvement

Yuan Tian created IOTDB-5522:
--------------------------------

             Summary: Last Query performance improvement
                 Key: IOTDB-5522
                 URL: https://issues.apache.org/jira/browse/IOTDB-5522
             Project: Apache IoTDB
          Issue Type: Improvement
          Components: Core/Query
            Reporter: Yuan Tian
            Assignee: liaolanyu
         Attachments: image-2023-02-10-21-23-28-478.png

If we have a lot of data regions and then we execute `select last s1 from root.sg.d1`, this sql may not execute that fast as we expected, because it may need to wait for all data regions' result and then merge it.



In some user's case, we build a 1C9D cluster, we set dataregion per database to 27. We need 300ms to get the last query result which even slower than MatrixDB.

!image-2023-02-10-21-23-28-478.png!



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