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https://issues.apache.org/jira/browse/DERBY-3791?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kristian Waagan closed DERBY-3791.
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Closed the issue.
There might still be a small optimization possibility for small Clobs (not
stored as a stream) by not creating a TemporaryClob for them, but I don't think
it is worth the hassle at the moment.
> 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
> Fix For: 10.4.2.0, 10.5.0.0
>
> Attachments: derby-3791-1a-buffer_fix.diff,
> derby-3791-2a-buffer-adjustments.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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