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https://issues.apache.org/jira/browse/DERBY-6135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13633157#comment-13633157
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Tony Brusseau commented on DERBY-6135:
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No, the id's never start anywhere near 0. The upper 8 bits of the long is used
to represent type info, and the numbers grow normally from there. So the upper
byte and lower 3-4 bytes always have relevant data bits set.
> Request data compression scheme (i.e., gzip of data pages)
> ----------------------------------------------------------
>
> Key: DERBY-6135
> URL: https://issues.apache.org/jira/browse/DERBY-6135
> Project: Derby
> Issue Type: Improvement
> Components: Store
> Reporter: Tony Brusseau
>
> This is a request for a data compression scheme facility added to Derby
> (something like gzip of data pages). MySQL and some other databases provide
> such a feature, see:
> http://dev.mysql.com/doc/innodb-plugin/1.0/en/innodb-compression-internals.html
> The desire for this is because my current database size is 27GB but gzipped,
> it goes down to 7GB. I wish to scale my database dramatically, but the
> current disk footprint would prevent me from being able to use Derby.
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