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https://issues.apache.org/jira/browse/DERBY-3934?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kristian Waagan updated DERBY-3934:
-----------------------------------
Derby Info: (was: [Patch Available])
Regression tests for patch 5a ran without failures.
Committed to trunk with revision 736000.
> 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
> Fix For: 10.5.0.0
>
> 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,
> derby-3934-4a-getinternalreader_cachedlength.diff,
> derby-3934-5a-UTF8Reader_cleanup.diff
>
>
> 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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