Jim Nasby wrote:
On Dec 20, 2006, at 7:56 AM, Florian G. Pflug wrote:
Jim Nasby wrote:
I'm teaching a class this week and a student asked me about OIDs. He
related the story of how in Sybase, if you moved a database from one
server from another, permissions got all screwed up because user IDs
no longer matched. I explained that exposing something like an
integer ID in a user interface or an API is just a bad idea and
PostgreSQL doesn't do that.
Then I got to pg_autovacuum....
So... is there any reason there isn't a prescribed interface to
pg_autovacuum that doesn't expose vacrelid? Can we get that added to
TODO?
Wouldn't it be sufficient to change the type of vacrelid from oid
to regclass? Then just dumping and restoring pg_autovacuum like any
other table should Just Work.
I think that would work, though as I mentioned we'd also want to set
reasonable defaults on the table if we decide to keep that as our
interface.
On the other hand, this would be the only part of the system where the
official interface/API is a system catalog table. Do we really want to
expose the internal representation of something as our API? That
doesn't seem wise to me...
Additionally, AFAIK it is not safe to go poking data into catalogs
willy-nilly. Having one table where this is the interface to the
system seems like it could lead to some dangerous confusion.
I thought the plan was to change the ALTER TABLE command to allow vacuum
settings to be set. I may be totally away from the mark. But if this
was the case it would mean that dumps would just need an alter table
statement to maintain autovacuum information. There is an advantage
that if you only dump some tables, their autovac settings would go with
them. But is that a good thing?
Reagrds
Russell Smith
--
Jim Nasby [EMAIL PROTECTED]
EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)
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