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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3825) StoreStreamClob.getReader(charPos) performs poorly
Date Tue, 04 Nov 2008 10:48:44 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644941#action_12644941
] 

Kristian Waagan commented on DERBY-3825:
----------------------------------------

Thanks for letting me know, Ole.

I'm not sure how this slipped though, guess I have to look at my test-deployment scripts...
Committed fix to 10.4 with revision 711221.

I'm sorry for the noise.

> StoreStreamClob.getReader(charPos) performs poorly
> --------------------------------------------------
>
>                 Key: DERBY-3825
>                 URL: https://issues.apache.org/jira/browse/DERBY-3825
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC, Store
>    Affects Versions: 10.5.0.0
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>             Fix For: 10.4.2.1, 10.5.0.0
>
>         Attachments: derby-3825-0a-preview.diff, derby-3825-1a-reset_readpositioninbuffer.diff,
derby-3825-2a-internalReader_repositioning.diff, derby-3825-2a-internalReader_repositioning.stat,
derby-3825-2b-internalReader_repositioning.diff, derby-3825-3a-simplification.diff
>
>
> StoreStreamClob.getReader(charPos) performs poorly because it resets the underlying stream
and skips data until it reached the requested character position. Not only does the data has
to be skipped, it also has to be decoded (UTF-8).
> The problem is exposed through EmbedClob.getSubString, which causes extremely bad performance
for the client driver because the locator based Clob implementation uses this method.
> For the record, there is another read buffer size issue that exaggerates the problem
(it will probably be handled under DERBY-3769, and also DERBY-3818).

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