3 ms·Just because it does it in tempdb, doesn't mean its not MVCC. That's an implementation detail.by UK-AL 10y agoJust because it does it in tempdb, doesn't mean its not MVCC. That's an implementation detail.serguzest 10y agoIn postgres (and probably in others aswell), MVCC implemented in Btree storage level. there is an overhead to write tempdb.anarazel 10y agoBtrees in postgres have no visibility information, MVCC is implemented on the heap level.