Investigate the performance effect of adding an index to the Derby jar files
(derby.jar, etc.)
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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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