[jira] Resolved: (DERBY-4661) Reduce size of encoding buffer for short character values

["Kristian Waagan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-4661?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kristian Waagan resolved DERBY-4661.
------------------------------------

    Issue & fix info:   (was: [Patch Available])
       Fix Version/s: 10.7.0.0
          Resolution: Fixed

> 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
>             Fix For: 10.7.0.0
>
>         Attachments: derby-4661-1a-reduce_encoding_bz.diff, derby-4661-1a-reduce_encoding_bz.stat, derby-4661-1b-reduce_encoding_bz.diff, 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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