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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 updated DERBY-3791:
-----------------------------------
Attachment: derby-3791-2a-buffer-adjustments.diff
'derby-3791-2a-buffer-adjustments.diff' adjusts the buffer sizes of the
internal char array and the BufferedInputStream.
If the Clob is known to be smaller than 8 KB (maximum allowed buffer size), the
buffer is set to match the Clob size.
Note that the internal buffer is for characters, whereas the stream buffers
bytes. The same size is used for both.
Committed to trunk with revision 681723.
> 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,
> 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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