Does anybody here know what is the definition of the DB block format and
in which source file can I find it? Also, where in the source can I find
the lock manager? I would like to take a look at that, too.


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Mladen Gogala
The preferred term is "page", I think.
http://www.postgresql.org/docs/curre...ge-layout.html
This page also refers you to
src/include/storage/bufpage.h
for details.

src/backend/storage/lmgr

Start by reading the README there.

Yours,
Laurenz Albe