"Alvaro Herrera" <alvherre@alvh.no-ip.org> writes
>
> Interesting; do they use an overwriting storage manager like Oracle, or
> a non-overwriting one like Postgres?
>
They call this MVCC "RLV(row level versioning)". I think they use rollback
segment like Oracle (a.k.a "version store" or tempdb in SQL Server). Some
details are explained in their white paper:"Database concurrency and row
level versioning in SQL Server 2005".
Regards,
Qingqing