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https://issues.apache.org/jira/browse/DERBY-3130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen resolved DERBY-3130.
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Resolution: Fixed
Fix Version/s: 10.4.1.0
Committed to 10.4 with revision 644209.
> Reduce memory footprint of StoredRecordHeader
> ---------------------------------------------
>
> Key: DERBY-3130
> URL: https://issues.apache.org/jira/browse/DERBY-3130
> Project: Derby
> Issue Type: Improvement
> Components: Store
> Affects Versions: 10.4.0.0
> Reporter: Knut Anders Hatlen
> Assignee: Knut Anders Hatlen
> Priority: Minor
> Fix For: 10.4.1.0, 10.5.0.0
>
> Attachments: d3130-1a.diff, SmallRecordsTest.java, srh.diff
>
>
> Derby's page cache often has a memory footprint that is much larger than
> pageSize*pageCacheSize. One large contributor to the footprint is the array
> of StoredPageHeader objects in BasePage. The memory consumed by these objects
> can be as large as, and sometimes even larger than, the byte arrays
> containing the raw page data. (See for instance
> http://www.nabble.com/How-much-derby-need-memory--tf3307655.html.) Reducing
> the size of the StoredPageHeader objects could therefore reduce Derby's
> memory footprint significantly, especially if the page cache is large and
> contains many pages from tables with small records or from indices.
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