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https://issues.apache.org/jira/browse/DERBY-4543?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kristian Waagan closed DERBY-4543.
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Closing issue.
> CLOB values incorrectly stored on disk using the old header format
> ------------------------------------------------------------------
>
> Key: DERBY-4543
> URL: https://issues.apache.org/jira/browse/DERBY-4543
> Project: Derby
> Issue Type: Bug
> Components: JDBC, Store
> Affects Versions: 10.6.0.0
> Reporter: Kristian Waagan
> Assignee: Kristian Waagan
> Fix For: 10.6.0.0
>
> Attachments: derby-4543-1a-clob_hdr_format_fix.diff
>
>
> The logic determining whether CLOB values should be stored using the old (pre
> 10.5) or the new header format has two bugs, which sometimes causes the old
> format to be used even though the new one should be used.
> The naming of the relevant methods are also problematic, as we're not really
> interested in whether we are in soft-upgrade mode or not. If you soft-upgrade
> from 10.5 to 10.6, the new header format should still be used.
> The consequences of these bugs are potential loss of performance for certain
> operations on CLOB values and in some cases it might cause a crash if the
> source stream cannot be rewinded/reset.
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