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https://issues.apache.org/jira/browse/DERBY-5207?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kathey Marsden updated DERBY-5207:
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Issue & fix info: Newcomer,Patch Available (was: Newcomer)
> Fix the description of Derby's stored page format, found on the web site.
> -------------------------------------------------------------------------
>
> Key: DERBY-5207
> URL: https://issues.apache.org/jira/browse/DERBY-5207
> Project: Derby
> Issue Type: Improvement
> Components: Web Site
> Affects Versions: 10.9.0.0
> Reporter: Rick Hillegas
> Assignee: Mohamed Nufail
> Attachments: DERBY-5207.patch
>
>
> I have found some discrepancies between Derby code and the description of the
> stored page format found on our web site
> (http://db.apache.org/derby/papers/pageformats.html):
> 1) The website correctly says that the page header is 56 bytes long. However,
> you get 58 bytes if you add up the values in the left column of
> http://db.apache.org/derby/papers/pageformats.html#storedpage. The extra 2
> bytes come from the inclusion of an unsigned short representing "% of the
> page to keep free for updates". That field does not appear in
> StoredPage.readPageHeader(). The field should be removed from the web site
> page.
> 2) That table has an additional problem: the "spare for future use
> (encryption uses to write random bytes here)" field is correctly listed as
> being 4 bytes long (in the left column) but the middle column says that it is
> a long. That middle column should say that the value is an integer.
> 3) Although the first 4 bytes of the AllocPage header are devoted to a
> Formatable ID, the actual Formatable ID only occupies the leading 2 bytes of
> the page. The next 2 bytes are unused. The first line of the "Format of Alloc
> Page" table should note this fact.
> 4) There is no RECORD_INITIAL bit in the record header status field.
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