Re: 9.4 Proposal: Initdb creates a single table

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От Alvaro Herrera
Тема Re: 9.4 Proposal: Initdb creates a single table
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Msg-id 20140424170018.GZ25695@eldon.alvh.no-ip.org
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Ответ на Re: 9.4 Proposal: Initdb creates a single table  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: 9.4 Proposal: Initdb creates a single table  (Heikki Linnakangas <hlinnakangas@vmware.com>)
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Tom Lane wrote:

> This is not our fault, and I don't want us to get caught up in trying
> to fix a fundamentally broken concept --- which is what a generic
> "uuidserial" API would be.  If you try to paper over the difficulties
> here, they'll just bite you on the rear someday.

But we have non-colliding generation technology for OIDs in system
catalogs.  We could try to reuse the idea in a UUID generator: grab one
value, try to insert; if it fails generate a new one, lather, rinse,
repeat.

This would make uuidserial not quite as simple as SERIAL pseudotype, of
course.

-- 
Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services



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