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https://issues.apache.org/jira/browse/DERBY-4227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12709060#action_12709060
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Knut Anders Hatlen commented on DERBY-4227:
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And just for the record, I have not been able to verify the degradation seen in
the nightly regression tests. I've tried to rerun the tests with jar files from
each day the last two and a half months, but I don't see any degradation, so I
assume it's a problem with the environment. The test in question runs the
following command:
java -server -Dderby.storage.pageCacheSize=25000
org.apache.derbyTesting.perf.clients.Runner -load sr_select -load_opts
nonIndexed
> performance degradation of 10.5.1.1 with simple queries & no data retrieval
> ---------------------------------------------------------------------------
>
> Key: DERBY-4227
> URL: https://issues.apache.org/jira/browse/DERBY-4227
> Project: Derby
> Issue Type: Bug
> Affects Versions: 10.5.1.1, 10.6.0.0
> Reporter: Myrna van Lunteren
> Attachments: scanperf.java
>
>
> I have been executing some non-contributed (and not easily contributable)
> performance tests, and found that across the board, with the exception of
> some blob streaming and complicated queries, 10.5.1.1 performs significantly
> worse from 10.4.2.0.
> I've turned one of these tests into a little repro script.
> It's decidedly hokey, but if you execute this repeatedly (removing the
> wombatC db and derby.log each time) you'll likely find the same. I executed
> this on an MS-Windows 2000 machine, with ibm 1.5. jvm.
> As a quick comparison, I got the following data out of executing the repro 4
> times with a fairly recent 10.3.3.1 build (706492), 10.4.2.0, and 10.5.1.1.
> Time is the elapsed time printed out at the end by the repro.
> version 10.3.3.1 10.4.2.0 10.5.1.1
> 1st run 187 219 328
> 2nd run 172 172 328
> 3rd run 203 234 313
> 4th run 187 281 344
> We should identify why a simple select without actually fetching the data
> would do so much worse with 10.5.1.1.
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