[jira] Updated: (DERBY-1876) Investigate overhead of JDBC layer and compiled activation code for simple embedded read-only, forward ResultSets

["Daniel John Debrunner (JIRA)" <de...@db.apache.org>]

     [ http://issues.apache.org/jira/browse/DERBY-1876?page=all ]

Daniel John Debrunner updated DERBY-1876:
-----------------------------------------

    Attachment: derby1876.java

Simple java program, derby1876, that runs a VALUES statement a number of times and measures its performance. The SQL query is simple so that the store and most of the SQL language layer is factored out of measurement, to allow focus on the base infrastructure.

Can be used as a test-bed for performance investigations for this issue.

> Investigate overhead of JDBC layer and compiled activation code for simple embedded read-only, forward ResultSets
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-1876
>                 URL: http://issues.apache.org/jira/browse/DERBY-1876
>             Project: Derby
>          Issue Type: Improvement
>          Components: JDBC, Performance
>            Reporter: Daniel John Debrunner
>            Priority: Minor
>         Attachments: derby1876.java
>
>
> 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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