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https://issues.apache.org/jira/browse/DERBY-2904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12510912
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Daniel John Debrunner commented on DERBY-2904:
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Yes, it can easily enabled using ant's jar target.
> Investigate the performance effect of adding an index to the Derby jar files
> (derby.jar, etc.)
> ----------------------------------------------------------------------------------------------
>
> Key: DERBY-2904
> URL: https://issues.apache.org/jira/browse/DERBY-2904
> Project: Derby
> Issue Type: Improvement
> Components: Performance
> Reporter: Daniel John Debrunner
> Priority: Minor
>
> Since JDK 1.3 the Java jar format has supported an index to speed up class
> loading. Sounds like it would be useful for derby's jar file, especially
> derby.jar with its many classes. The ant jar target has an index attribute to
> enabled the index.
> Would be interesting to see the performance benefit and the increased size of
> the jar files.
> As a thought for a performance test, a simple test that loaded Derby in
> separate class loaders, opened an existing database and executed a query to
> load as many classes as possible.
> for (number of iterations)
> {
> create new class loader
> load derby in class loader
> boot database
> prepare query
> shutdown derby
> }
> Then time with a reasonable number of iterations. (I think 1 is too few,
> hence the use of a class loader).
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