From: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
---|---|
To: | Josh Berkus <josh(at)agliodbs(dot)com> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: global temporary tables |
Date: | 2010-04-25 21:51:28 |
Message-ID: | 4BD4B960.5010204@dunslane.net |
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Thread: | |
Lists: | pgsql-hackers |
Josh Berkus wrote:
> Robert,
>
>> (1). What I *think* it is supposed to mean is that the table is a
>> permanent object which is "globally" visible - that is, it's part of
>> some non-temp schema like public or $user and it's column definitions
>> etc. are visible to all backends - and it's not automatically removed
>> on commit, backend exit, etc. - but the *contents* of the table are
>> temporary and backend-local, so that each new backend initially sees
>> it as empty and can then insert, update, and delete data independently
>> of what any other backend does.
>
> While closer to the standard, the above definition is a lot less
> useful than what I believe a lot of people want, which is a table
> which is globally visible, but has no durability; that is, it does not
> get WAL-logged or recovered on restart. Certainly this latter
> definition would be far more useful to support materialized views.
These are not mutually exclusive features. What you're asking for has
value, certainly, but it's not a temp table in the standard's terms
(which is a feature that also has value, I believe).
cheers
andrew
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