Re: Question about isolation level documentation

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.

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