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https://issues.apache.org/jira/browse/DERBY-6841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14995460#comment-14995460
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Xavion commented on DERBY-6841:
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Sorry, it's a proprietary application and the databases contain information
that I can't disclose. The best I can give you is fragments of the code and
similar databases containing random data (if necessary).
However, to begin with, just test using your own embedded Derby application. I
simply added System.nanoTime() calls immediately before and after
connecting/processing/disconnecting to get the event durations. The databases
are unencrypted, but I have to supply a username and password when
connecting/disconnecting.
Each one contains hundreds/thousands of text files, which are up to a few
kilobytes in size each. During the processing phase, I'm extracting each of
these as Clobs. A single thread is dedicated to each database, and there are
about 40 of them in total. Let me know if that isn't enough to reproduce the
issue at your end.
> Derby v10.12.1.1 is horribly slow compared to v10.11.1.1 in embedded mode
> -------------------------------------------------------------------------
>
> Key: DERBY-6841
> URL: https://issues.apache.org/jira/browse/DERBY-6841
> Project: Derby
> Issue Type: Bug
> Components: JDBC, SQL
> Affects Versions: 10.12.1.1
> Environment: OS: Windows, OS X, Linux
> CPU: Quad-Core Intel i5
> App: Swing, multi-threaded
> Reporter: Xavion
> Fix For: 10.11.1.1
>
>
> It takes much longer to open, read, and close embedded databases using
> v10.12.1.1 than it did with v10.11.1.1. What ever changes you guys made over
> the last year and a bit have definitely been for the worse.
> Below are the results of the repetition tests I've just run on the same
> computer with the same databases. Let me know if you need to know about the
> sizes of the databases and/or the file type they contain.
> Connecting with v10.11.1.1:
> Database opened in 0.82 seconds.
> Database opened in 0.77 seconds.
> Database opened in 0.88 seconds.
> Database opened in 0.77 seconds.
> Database opened in 0.77 seconds.
> Database opened in 0.96 seconds.
> Database opened in 0.74 seconds.
> Connecting with v10.12.1.1:
> Database opened in 1.98 seconds.
> Database opened in 2.07 seconds.
> Database opened in 1.97 seconds.
> Database opened in 2.01 seconds.
> Database opened in 2.01 seconds.
> Database opened in 2.00 seconds.
> Database opened in 2.03 seconds.
> Reading with v10.11.1.1:
> Database processed in 6.17 seconds.
> Database processed in 4.00 seconds.
> Database processed in 3.67 seconds.
> Database processed in 3.66 seconds.
> Database processed in 3.78 seconds.
> Database processed in 3.69 seconds.
> Database processed in 3.74 seconds.
> Reading with v10.12.1.1:
> Database processed in 7.29 seconds.
> Database processed in 4.54 seconds.
> Database processed in 4.88 seconds.
> Database processed in 4.65 seconds.
> Database processed in 4.34 seconds.
> Database processed in 4.35 seconds.
> Database processed in 4.50 seconds.
> Disconnecting with v10.11.1.1:
> Database closed in 0.11 seconds.
> Database closed in 0.13 seconds.
> Database closed in 0.15 seconds.
> Database closed in 0.14 seconds.
> Database closed in 0.10 seconds.
> Database closed in 0.13 seconds.
> Database closed in 0.14 seconds.
> Disconnecting with v10.12.1.1:
> Database closed in 0.74 seconds.
> Database closed in 0.87 seconds.
> Database closed in 0.76 seconds.
> Database closed in 0.87 seconds.
> Database closed in 0.85 seconds.
> Database closed in 0.69 seconds.
> Database closed in 0.84 seconds.
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