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Posted to notifications@iotdb.apache.org by "Julian Feinauer (Jira)" <ji...@apache.org> on 2020/06/08 07:15:00 UTC

[jira] [Commented] (IOTDB-749) Handle select * from root OOM

    [ https://issues.apache.org/jira/browse/IOTDB-749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17127947#comment-17127947 ] 

Julian Feinauer commented on IOTDB-749:
---------------------------------------

What about generally returning batches of results? Many SQL Servers do it that way and this would help us to better controll the memory as we would only need to store one batch at a time.

> Handle select * from root OOM
> -----------------------------
>
>                 Key: IOTDB-749
>                 URL: https://issues.apache.org/jira/browse/IOTDB-749
>             Project: Apache IoTDB
>          Issue Type: Improvement
>          Components: Core/Engine
>            Reporter: Jialin Qiao
>            Priority: Major
>
> In this query, select * from root
> the server will cache [the total time series * fetch size] points. This may cause OOM, we need to handle this.



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