Quoting Brian Maguire [EMAIL PROTECTED]:
That's right it's a big one from a performance and admin perspective. DB2,
Oracle and Informix have tablespaces. It appears that it has been in the
postgres crosshair for a few years now. I'm not sure how much has been
completed so far.
Few scenarios where they are really important:
1.
Right now a database can be as fast as one disk. Tablespaces allow you to
distribute database objects across multiple physical locations. A big index
or table can live on separate disks distributing the io activity.
2.
Say you are close to running out of disk space and want to grow some of the
data onto another disk. Table spaces allow you to alter the table space and
more easily move the big table or indexes onto a different disk rather than
just moving the entire db to a bigger single disk.
3.
Say there is a part of a database that you want to backup every hour, but
backing up entire database is overkill. You can set it up so it backs up
different table spaces at different times.
4.
Couple other features of tablespaces are that they allow you to allocate
space to a specific tablespace and to take only part of a database offline or
online very easily.
More detail on what they are how to mange them with oracle...
http://www.engin.umich.edu/caen/wls/software/oracle/server.901/a88856/c04space.htm
http://www.siue.edu/~dbock/cmis565/ch8-tablespaces.htm
http://www-rohan.sdsu.edu/doc/oracle/server803/A54641_01/ch8.htm
-Original Message-
From: John Sidney-Woollett [mailto:[EMAIL PROTECTED]
Sent: Sat 12/13/2003 4:38 AM
To: Keith C. Perry
Cc: Bruce Momjian; Brian Maguire; [EMAIL PROTECTED]
Subject: Re: [GENERAL] tablespaces in 7.5?
My (limited) understanding is that it will give you the ability to:
i) decide what data resides in what tablespace, (database, schema,
indexes, data [coarser - finer grain]).
ii) where the tablespace data is physically located, allowing you to
distribute your database across disks, or disk arrays.
John Sidney-Woollett
Keith C. Perry said:
Quoting Bruce Momjian [EMAIL PROTECTED]:
Brian Maguire wrote:
I am curious if tablespaces are going to be seriously targeted
for the next version. It really opens up new levels of scalability
and is a killer feature from an administration perspective.
I hope so!
--
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Excuse my ignorance but what will namespaces give us? I though PG schema
provided the namespace functionality- 'least the way I am understanding
the term.
--
Keith C. Perry, MS E.E.
Director of Networks Applications
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6: Have you searched our list archives?
http://archives.postgresql.org
Ok, thats for the response. I take it a PG namespace = Oracle table space (or
namespace is simply the generic term). I can see some definite benefits
especially with disk i/o throughput though I thought database partitioning (I
think that is what its called) would provide the same thing.
This actually sounds like system that might fit well on a Plan 9 OS.
Anyway, thanks to all for the explanations.
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Keith C. Perry, MS E.E.
Director of Networks Applications
VCSN, Inc.
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