| From: | "Andrey V(dot) Lepikhov" <a(dot)lepikhov(at)postgrespro(dot)ru> |
|---|---|
| To: | "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com>, "movead(dot)li(at)highgo(dot)ca" <movead(dot)li(at)highgo(dot)ca> |
| Cc: | 'Amit Kapila' <amit(dot)kapila16(at)gmail(dot)com>, Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com>, Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com>, PostgreSQL-Dev <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Global snapshots |
| Date: | 2020-07-27 06:44:54 |
| Message-ID: | 806c3708-26ea-b94d-87b1-d48e41e93726@postgrespro.ru |
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| Lists: | pgsql-hackers |
On 7/27/20 11:22 AM, tsunakawa(dot)takay(at)fujitsu(dot)com wrote:
> Hi Andrey san, Movead san,
>
>
> From: tsunakawa(dot)takay(at)fujitsu(dot)com <tsunakawa(dot)takay(at)fujitsu(dot)com>
>> While Clock-SI seems to be considered the best promising for global
>> serializability here,
>>
>> * Why does Clock-SI gets so much attention? How did Clock-SI become the
>> only choice?
>>
>> * Clock-SI was devised in Microsoft Research. Does Microsoft or some other
>> organization use Clock-SI?
>
> Could you take a look at this patent? I'm afraid this is the Clock-SI for MVCC. Microsoft holds this until 2031. I couldn't find this with the keyword "Clock-SI.""
>
>
> US8356007B2 - Distributed transaction management for database systems with multiversioning - Google Patents
> https://patents.google.com/patent/US8356007
>
>
> If it is, can we circumvent this patent?
>
>
> Regards
> Takayuki Tsunakawa
>
>
Thank you for the research (and previous links too).
I haven't seen this patent before. This should be carefully studied.
--
regards,
Andrey Lepikhov
Postgres Professional
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