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Date: Sun, 14 Oct 2007 09:50:50 -0700 (PDT)
From: "Knut Anders Hatlen (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Created: (DERBY-3130) Reduce memory footprint of
 StoredRecordHeader
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Reduce memory footprint of StoredRecordHeader
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                 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
            Priority: Minor


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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