[jira] Updated: (DERBY-2634) CLOB performance partially very poor on linux system

["Dag H. Wanvik (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-2634?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dag H. Wanvik updated DERBY-2634:
---------------------------------

    Derby Categories: [Performance]

> CLOB performance partially very poor on linux system
> ----------------------------------------------------
>
>                 Key: DERBY-2634
>                 URL: https://issues.apache.org/jira/browse/DERBY-2634
>             Project: Derby
>          Issue Type: Improvement
>          Components: Network Client, Network Server
>    Affects Versions: 10.2.2.0, 10.3.1.4
>         Environment: gnu linux, network client and network server on the same machine
>            Reporter: Frank-Ralph Reiser
>         Attachments: derbytest-linux-laptop-1.66GHz.txt, testcase.zip
>
>
> Doing some performance tests with several differente database implementations, we noticed very poor query performance of apache derby under certain conditions.
> If the select statement selects a CLOB column and if it contains a subselect, traversing the ResultSet takes very long with nearly no cpu load.

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