Subject ext. MVR transactions approach
Author Alexandre Kozlov
Hi all,

I guess it would be rather nice deal to include next feature in

I never heard about it and so named as "Commutative updates" but stick to this name.
This feature expands slogan "writer never blocks readers and vice versa"
up to
"writers never interfere with each other doing commutative updates".
Commutative update is the update which increase or decrease numeric
field by some value.
This feature is rather naturally implemented in multi-version
architecture and will be appreciated
by many developers who wants to maintain subtotals and totals on large data tables. Moreover,
this feature can be
intrinsicly exploited by DB engine to maintain number of records in


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