[jira] Commented: (DERBY-818) Read-only embedded ResultSets incur performance penalty due to updateable ResultSet code.

["Mamta A. Satoor (JIRA)" <de...@db.apache.org>]

    [ http://issues.apache.org/jira/browse/DERBY-818?page=comments#action_12362911 ] 

Mamta A. Satoor commented on DERBY-818:
---------------------------------------

I looked through the changes and they look good. I should have been more cautious when I originally wrote this code.

> Read-only embedded ResultSets incur performance penalty due to updateable ResultSet code.
> -----------------------------------------------------------------------------------------
>
>          Key: DERBY-818
>          URL: http://issues.apache.org/jira/browse/DERBY-818
>      Project: Derby
>         Type: Improvement
>   Components: JDBC, Performance
>     Reporter: Daniel John Debrunner
>     Assignee: Daniel John Debrunner
>     Priority: Minor
>  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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