MVCC doc improvements

Neil Conway <neilc@samurai.com> writes:

This patch improves the MVCC documentation: I added some additional
discussion of deadlock conditions, removed a mis-statement about index
locking, and made minor edits in a couple other places.

- </para>
-
- <para>
- In short, B-tree indexes are the recommended index type for concurrent
- applications.
</para>

AFAICS, that is not a misstatement. B-trees are still the only
recommended index type for concurrent-update situations ...
hash has deadlock issues and the other two are just plain not
concurrent.

regards, tom lane

On Tue, 2002-12-17 at 11:35, Tom Lane wrote:

AFAICS, that is not a misstatement. B-trees are still the only
recommended index type for concurrent-update situations ...
hash has deadlock issues and the other two are just plain not
concurrent.

Yes, but what I disagree with is the recommendation that "concurrent
applications" should use B-trees -- a concurrent application that wishes
to index non-scalar data won't have a lot of success using B-trees,
page-level locks or not...

Cheers,

Neil
--
Neil Conway <neilc@samurai.com> || PGP Key ID: DB3C29FC

Neil Conway <neilc@samurai.com> writes:

Yes, but what I disagree with is the recommendation that "concurrent
applications" should use B-trees -- a concurrent application that wishes
to index non-scalar data won't have a lot of success using B-trees,

True, there are cases where you have no choice. That does not mean that
we should fail to make this recommendation for cases where you have a
choice.

I'm not objecting to improving the text. I am objecting to deleting it
outright...

regards, tom lane

On Tue, 2002-12-17 at 11:53, Tom Lane wrote:

I'm not objecting to improving the text. I am objecting to deleting it
outright...

Ok, fair enough. I've attached a revised version of the patch -- let me
know you think it needs further improvements.

Cheers,

Neil

Your patch has been added to the PostgreSQL unapplied patches list at:

http://momjian.postgresql.org/cgi-bin/pgpatches

I will try to apply it within the next 48 hours.

---------------------------------------------------------------------------

Neil Conway wrote:

On Tue, 2002-12-17 at 11:53, Tom Lane wrote:

I'm not objecting to improving the text. I am objecting to deleting it
outright...

Ok, fair enough. I've attached a revised version of the patch -- let me
know you think it needs further improvements.

Cheers,

Neil

[ Attachment, skipping... ]

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Patch applied. Thanks.

---------------------------------------------------------------------------

Neil Conway wrote:

On Tue, 2002-12-17 at 11:53, Tom Lane wrote:

I'm not objecting to improving the text. I am objecting to deleting it
outright...

Ok, fair enough. I've attached a revised version of the patch -- let me
know you think it needs further improvements.

Cheers,

Neil

[ Attachment, skipping... ]

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-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073