Thread: STORAGE: Time versions and Delta records

Some questions about the storage system:

How PostgreSQL store tuples? Using the Postgre (no SQL) mechanism of an
anchor pointer (to the original tuple) and a list of pointers to the (delta
tuples) differences with the initial register?

It´s possible access to the value of a tuple in a specified time? Or only
acces to the actual value?

What function access the value of a tuple from the disk?

Thanks everybody.

Francisco Javier Cuberos.