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From "Steffen Kuche (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-5555) Execution Time with a Statement 1 ms and with a PreparedStatement about 4 minutes
Date Fri, 23 Dec 2011 12:10:30 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Steffen Kuche updated DERBY-5555:

    Attachment: test.zip
> Execution Time with a Statement 1 ms and with a PreparedStatement about 4 minutes
> ---------------------------------------------------------------------------------
>                 Key: DERBY-5555
>                 URL: https://issues.apache.org/jira/browse/DERBY-5555
>             Project: Derby
>          Issue Type: Bug
>            Reporter: Steffen Kuche
>         Attachments: test.zip
> Sounds incrediable? Test it by yourself with the attached program.
> The issued reased up because of AMQ-3644, but it is actually a derby problem so I post
the issue here as well.
> Derby writes multiple gigabyte of temporary files in its tmp directory during one select
statement. Afterwards these temporary files are deleted and rebuild by the next Statement.

> You can find a Test-Program (import it as a Maven-Eclipse project) which reproduces this
> This program creates a derby database with a the activemq Message table and fills it
with data (2000 Messages, this can take several hours). I assumed 3MB for one message as our
messages contain same binary data and has an average size of 3MB.
> After the database is built one time a Statement and one time a PreparedStatment is used
to retrieve the next messages.
> The Statement takes about 1 ms and the PreparedStatement about 258805 ms. Also the second
PreparedStatement takes as much time.

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