On 28.12.09 18:54 , Kevin Grittner wrote:
To give some idea of the scope of development, Michael Cahill added
SSI to InnoDB by modifying 250 lines of code and adding 450 lines of
 code; however, InnoDB already had the S2PL option and the prototype
 implementation isn't as sophisticated as I feel is necessary for
real production use (particularly regarding the granularity of SIREAD
locks).  I'm assuming it would take more to reach real production
quality in PostgreSQL.  My SWAG would be to multiply by two or
three.

I believe the hard part of implementing true serializability is not the
actual SSI or S2PL algorithm, but rather the necessary predicate locking
strategy.

So I think checking how InnoDB tackles that and how much of it's code is
invovled might give a more realistic estimate of the effort required.

best regards,
Florian Plug

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