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https://issues.apache.org/jira/browse/DERBY-3791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12616856#action_12616856
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Knut Anders Hatlen commented on DERBY-3791:
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The patch looks fine to me.
Just to check that I've understood correctly, removing the BufferedInputStream
won't affect the performance negatively because the underlying stream gets its
data from a byte array, so buffering the data in another byte array on top of
that won't improve the speed at which data can be read. Is that about right?
> Excessive memory usage when fetching small Clobs
> ------------------------------------------------
>
> Key: DERBY-3791
> URL: https://issues.apache.org/jira/browse/DERBY-3791
> Project: Derby
> Issue Type: Bug
> Components: JDBC
> Affects Versions: 10.2.2.0, 10.3.1.4, 10.4.1.3, 10.5.0.0
> Reporter: Kristian Waagan
> Assignee: Kristian Waagan
> Priority: Minor
> Attachments: derby-3791-1a-buffer_fix.diff
>
>
> When investigating DERBY-3312 I found out that performance with the embedded
> driver has decreased a lot as well.
> Analysis on trunk indicate excessive memory usage, causing high allocation
> and garbage collection costs.
> I believe there was another major performance problem in 10.3, but it appears
> fixed in trunk. I have not spent time identifying this problem.
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