[Info-ingres] ANSI + MVCC

[mike_cu80 at yahoo.com]

if one transaction with RR isolation locks some pages/rows and MVCC tries to read those rows , will it read their state before the RR took place?

in the other case that the MVCC transaction tries to update those same rows that RR has already locked,will it cause a serialization error?

and yet what happens in another case that MVCC is reading the rows and RR tries to get a lock on them for reading or updating?