Kenneth Downs <ken@secdat.com> writes:
> Speaking as an end-user, I can give only one I've ever seen, which is
> performance. Because of MVCC, Postgres's write performance (insert and
> update) appears on my systems to be almost exactly linear to row size.
> Inserting 1000 rows into a table with row size 100 characters takes
> twice as long as inserting 1000 rows into a table with row size 50
> characters.
Not sure why you'd think that's specific to MVCC. It sounds like purely
an issue of disk write bandwidth.
regards, tom lane