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https://issues.apache.org/jira/browse/DERBY-4661?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kristian Waagan updated DERBY-4661:
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Attachment: derby-4661-1b-reduce_encoding_bz.diff
Attached patch 1b.
Thanks for reviewing the patch, Knut Anders.
I have addressed your suggestions, and I also made a few other changes (size
logic, fixed two typos).
Regression tests passed (suites.All).
Patch ready for a second review.
> Reduce size of encoding buffer for short character values
> ---------------------------------------------------------
>
> Key: DERBY-4661
> URL: https://issues.apache.org/jira/browse/DERBY-4661
> Project: Derby
> Issue Type: Improvement
> Components: JDBC
> Affects Versions: 10.7.0.0
> Environment: Inserts using setXStream(int, Reader/InputStream,
> int/long) for short values on character columns
> Reporter: Kristian Waagan
> Assignee: Kristian Waagan
> Priority: Minor
> Attachments: derby-4661-1a-reduce_encoding_bz.diff,
> derby-4661-1a-reduce_encoding_bz.stat, derby-4661-1b-reduce_encoding_bz.diff
>
>
> When inserting character values Derby converts from Java char to an on-disk
> encoding of UTF-8. To to this, the user stream is read and the resulting
> bytes after conversion are placed in a "translation buffer". The default size
> of the buffer is 32 KB. When inserting a lot of short values, the pressure on
> the Java garbage collector is unnecessary high and the allocation/GC also
> causes a somewhat higher CPU usage.
> This effect of this issue can easily be reduced by sizing the buffer in the
> appropriate cases.
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