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https://issues.apache.org/jira/browse/IOTDB-749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17135631#comment-17135631
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Houliang Qi commented on IOTDB-749:
-----------------------------------

Wether is it too restrictive? Assuming that the number of query columns is M 
and the number of query rows is N, can it flexibly control the number of M*N to 
prevent OOM, rather than rejecting the query when the query columns exceeds a 
certain value?

> 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
>            Assignee: Yuan Tian
>            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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