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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-818) Read-only embedded ResultSets incur performance penalty due to updateable ResultSet code.
Date Mon, 29 Jun 2009 14:41:47 GMT

     [ https://issues.apache.org/jira/browse/DERBY-818?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dag H. Wanvik updated DERBY-818:
--------------------------------

    Derby Categories: [Performance]

> Read-only embedded ResultSets incur performance penalty due to updateable ResultSet code.
> -----------------------------------------------------------------------------------------
>
>                 Key: DERBY-818
>                 URL: https://issues.apache.org/jira/browse/DERBY-818
>             Project: Derby
>          Issue Type: Improvement
>          Components: JDBC
>            Reporter: Daniel John Debrunner
>            Assignee: Daniel John Debrunner
>            Priority: Minor
>             Fix For: 10.2.1.6
>
>         Attachments: derby818patch.txt
>
>
> The fields columnGotUpdated and copyOfDatabaseRow are allocated and maintained in EmbedResultSet
for every ResultSet but they are only required if the result set is updateable. I saw a 5%
improvement in execution rate on a simple VALUES clause when fixing this.

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