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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Closed: (DERBY-1876) Investigate overhead of JDBC layer and compiled activation code for simple embedded read-only, forward ResultSets
Date Wed, 28 Apr 2010 17:33:51 GMT

     [ https://issues.apache.org/jira/browse/DERBY-1876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rick Hillegas closed DERBY-1876.
--------------------------------

    Resolution: Fixed

It seems that a fair amount of work has been done in this area. Closing until someone wants
to re-open this issue and do more work.

> Investigate overhead of JDBC layer and compiled activation code for simple embedded read-only,
forward ResultSets
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-1876
>                 URL: https://issues.apache.org/jira/browse/DERBY-1876
>             Project: Derby
>          Issue Type: Improvement
>          Components: JDBC
>            Reporter: Daniel John Debrunner
>            Priority: Minor
>         Attachments: derby1862.java, derby1876.java, ers_current_row.txt, timeout_colcount.diff
>
>
> For simple ResultSet usage like:
> ResultSet rs = ps.executeQuery();
>       while (rs.next()) {
>               rs.getInt(1);
>               rs.getInt(2);
>               rs.getInt(3);
>        }
> rs.close();
> it would be interesting to see how much overhead could be removed with simple changes,
or possibly removed if there was a simple ResultSet implementation for forward only, read-only
ResultSet, and the more complete implementation for all other ResultSet types such as updateable
and/or scrollable. Has introducing updateable ResultSets, for example, degraded the performance
of read-only ResultSets? Could code be changed so that a typical read-only Resultset is not
affected by the code required for richer ResultSets?

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