Norman Dunbar is working in a new documentation describing some of the Firebird internals aspects, like the database file structure, compression used on records, etc.

The document is not finished, but already contains lots of good information.

You can download the currently version at:

http://www.firebirdsql.org/manual/fb-internals.html
http://www.firebirdsql.org/pdfmanual/Firebird-Internals.pdf

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