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Posted to derby-dev@db.apache.org by "Mamta A. Satoor (Updated) (JIRA)" <ji...@apache.org> on 2012/02/23 23:57:48 UTC
[jira] [Updated] (DERBY-5555) Execution Time with a Statement 1 ms
and with a PreparedStatement about 4 minutes
[ https://issues.apache.org/jira/browse/DERBY-5555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mamta A. Satoor updated DERBY-5555:
-----------------------------------
Urgency: Normal
Labels: derby_triage10_9 (was: )
> 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
> Components: SQL
> Affects Versions: 10.8.1.2, 10.8.2.2
> Reporter: Steffen Kuche
> Labels: derby_triage10_9
> Attachments: derby.log, 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 issue.
> This program creates a derby database with 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 another 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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