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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-3825) StoreStreamClob.getReader(charPos) performs poorly
Date Wed, 06 Aug 2008 14:20:44 GMT
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


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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