From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
---|---|
To: | Elliot S <yields(dot)falsehood(at)gmail(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Question about isolation level documentation |
Date: | 2014-04-08 20:09:26 |
Message-ID: | 20140408200926.GN5822@eldon.alvh.no-ip.org |
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Thread: | |
Lists: | pgsql-general |
Elliot S wrote:
> Is there a discussion somewhere regarding this line from the docs on
> transaction isolation: "When you select the level Read Uncommitted
> you really get Read Committed, and phantom reads are not possible in
> the PostgreSQL implementation of Repeatable Read"? I get that RU is
> the same as RC and why that is so, but why is RR mentioned in this
> sentence and more importantly why does it claim phantom reads aren't
> possible in RR despite the table above this paragraph clearly
> stating they are? It looks like a documentation issue associated
> with the true serialization mode introduced in 9.1.
I read that as saying that even though the standard defines repeatable
read as possibly having phantom reads, they don't occur in Postgres.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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