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https://issues.apache.org/jira/browse/IOTDB-512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17043237#comment-17043237
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FengQingxin commented on IOTDB-512:
-----------------------------------

Hi,

I have test this sql with the lastest code of iotdb [commit 
4b651008aecd01f0f8af3de1d77b0c722c48bcbf], and it works well.

But after that I tried another sql "select s_0 from root.*.d_0 limit 10".There 
is no response from iotdb server.

I fount an error message in iotdb server:

!image-2020-02-24-16-51-26-238.png!

> When I using [select count(*) from root.*.*] in iotdb-cli, I got an error 
> message like : OutOfMemoryError: Java heap space
> --------------------------------------------------------------------------------------------------------------------------
>
>                 Key: IOTDB-512
>                 URL: https://issues.apache.org/jira/browse/IOTDB-512
>             Project: Apache IoTDB
>          Issue Type: Bug
>          Components: Client/Java
>            Reporter: FengQingxin
>            Priority: Major
>         Attachments: image-2020-02-24-16-50-07-639.png, 
> image-2020-02-24-16-51-26-238.png, log_error.log
>
>
> Hello IoTDB Developers:
>    When I using [select count(*) from root.*.*] in iotdb-cli, I got an error 
> message like : {color:#FF0000}OutOfMemoryError: Java heap space{color}.
> IoTDB version: apache/iotdb master : 59cba45b28046264330aaedbab609590404f95af
> Data schema: SG=10;Device=50;Sensor=100;Points=1000000; Overflow:10%
> 11G ./sequence
> 1.2G ./unsequence
> 12G
>  
> Please help me to check this issue.Thanks.
> B.R



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