MultiXact ID
RU: MultiXact ID
A 32-bit id stored in a tuple's xmax when several transactions hold a shared lock on the row; it points to a member list and has its own wraparound clock.
RU: MultiXact ID
A 32-bit id stored in a tuple's xmax when several transactions hold a shared lock on the row; it points to a member list and has its own wraparound clock.