From: | Dave Page <dpage(at)pgadmin(dot)org> |
---|---|
To: | Joshua Berkus <josh(at)agliodbs(dot)com> |
Cc: | PostgreSQL Advocacy <pgsql-advocacy(at)postgresql(dot)org> |
Subject: | Re: Unlogged vs. In-Memory |
Date: | 2011-05-03 17:55:13 |
Message-ID: | BANLkTin-pJhCCEsMoOfucPym6eJMVypbYw@mail.gmail.com |
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Lists: | pgsql-advocacy pgsql-hackers |
On Tue, May 3, 2011 at 6:46 PM, Joshua Berkus <josh(at)agliodbs(dot)com> wrote:
>
> Saying "It's like a in-memory table" is a lot more successful. And it's using the term "in-memory" the same way a lot of other DBMSes market it, i.e. in-memory == non-durable & no disk writes.
Unlogged tables *are* written to disk though. And may be read from
there too - they are not pinned into memory.
> The important thing from my perspective is that unlogged tables give us the capabilities of a lot of the "in-memory" databases ... with unlogged tables and fsync off, for example, PostgreSQL becomes a viable caching database.
>
> When doing PR, it's more important to use terms people recognize than to use terms which are perfectly accurate. Nobody expects a news article to be perfectly accurate anyway.
I consider the term to be pretty much 100% inaccurate. When you say
in-memory to me, I think of a table that is pinned into buffer cache,
as you can do in some DBMS', thus *ensuring* the reads are fast, or of
a database or table that operates entirely in memory (perhaps with
occasional disk writes for persistence) like VoltDB, Redis or MySQL's
Memory storage manager.
> However, I posted this because I think that several folks in the community feel that this is going too far into the land of marketese, and I want to hash it out and get consensus before we start pitching 9.1 final.
Thank you.
--
Dave Page
Blog: http://pgsnake.blogspot.com
Twitter: @pgsnake
EnterpriseDB UK: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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