[
https://issues.apache.org/jira/browse/DERBY-3934?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kristian Waagan updated DERBY-3934:
-----------------------------------
Attachment: derby-3934-6a-UTF8Reader_remove_method.diff
Patch 6a removes the now unused method 'readUnsignedShort'. It is no longer
used because the reading of the header bytes have been moved outside the reader
class.
Committed to trunk with revision 742380.
> 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,
> derby-3934-6a-UTF8Reader_remove_method.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
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
