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Re: [COMMITTERS] pgsql: Create a "relation mapping" infrastructure to support changing

From: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: [COMMITTERS] pgsql: Create a "relation mapping" infrastructure to support changing
Date: 2010-02-08 13:47:02
Message-ID: 20100208134702.GB4113@alvh.no-ip.org (view raw or flat)
Thread:
Lists: pgsql-committerspgsql-hackers
I just noticed that this patch

> Create a "relation mapping" infrastructure to support changing the relfilenodes
> of shared or nailed system catalogs.  This has two key benefits:

creates a new function pg_relation_filenode() that only uses the
syscache to fetch the relation's filenode, without locking it.  I wonder
if we could do the same in the pg_relation_size() function and friends,
to avoid having to grab a lock on the relation.

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.

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