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Posted to derby-dev@db.apache.org by "Kristian Waagan (JIRA)" <ji...@apache.org> on 2008/12/08 10:10:44 UTC
[jira] Commented: (DERBY-3934) Improve performance of reading
modified Clobs
[ https://issues.apache.org/jira/browse/DERBY-3934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12654353#action_12654353 ]
Kristian Waagan commented on DERBY-3934:
----------------------------------------
Tests ran without errors.
Committed patch 3a to trunk with revision 724294.
> Improve performance of reading modified Clobs
> ---------------------------------------------
>
> Key: DERBY-3934
> URL: https://issues.apache.org/jira/browse/DERBY-3934
> Project: Derby
> Issue Type: Improvement
> Components: JDBC
> Affects Versions: 10.5.0.0
> Reporter: Kristian Waagan
> Assignee: Kristian Waagan
> Attachments: derby-3934-1a-clob_replace_test.diff, derby-3934-2a-intclob_new_methods.diff, derby-3934-3a-clobupdreader_utf8reader.diff, derby-3934-3a-clobupdreader_utf8reader.stat
>
>
> The performance of reading modified Clobs is poor, which is demonstrated by running a test program selecting a 10 MB Clob and then getting the contents using getSubString:
> - unmodified Clob (StoreStreamClob) : ~1 300 ms
> - modified Clob (TemporaryClob): ~156 000 ms
> In this case, the Clob was modified by changing the first character.
> A number of subtasks will be created to handle the various issues, which will be related to both performance and code cleanup.
> For a brief overview, see http://www.nabble.com/Suggestion-for-improving-ClobUpdatableReader-and-related-code-to20308303.html
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