Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl> writes:
> 1. To examine a tuple one must first call LockTuple, which grabs a pin
> and lock in the buffer. The buffer lock is released right away, but the
> pin is kept.
Surely you don't mean that *every* access to a tuple now has to go
through the lock manager :-(. Have you done any performance testing?
regards, tom lane