From: | Jim Nasby <decibel(at)decibel(dot)org> |
---|---|
To: | Jonah H(dot) Harris <jonah(dot)harris(at)gmail(dot)com> |
Cc: | "Greg Stark" <gsstark(at)mit(dot)edu>, "Mark Lewis" <mark(dot)lewis(at)mir3(dot)com>, pgsql-performance(at)lusis(dot)org, "PGSQL Performance" <pgsql-performance(at)postgresql(dot)org> |
Subject: | Re: Optimizer internals |
Date: | 2006-06-17 19:33:17 |
Message-ID: | 5F206F7D-D7F8-4F73-B932-13E7BC612524@decibel.org |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-performance |
On Jun 16, 2006, at 8:43 AM, Jonah H. Harris wrote:
> Yes, this is certainly the most noticible case. This is one reason
> I'm behind the freespace patch. Unfortunately, a lot of inexperienced
> people use VACUUM FULL and don't understand why VACUUM is *generally*
> better.(to free up block-level freespace and update FSM) assuming they
> have enough hard disk space for the database.
Another reason to turn autovac on by default in 8.2...
>> That and of course the visibility bitmap that has been
>> much-discussed
> I'd certainly like to see it.
What's the hold-up on this? I thought there were some technical
issues that had yet to be resolved?
BTW, I'll point out that DB2 and MSSQL didn't switch to MVCC until
their most recent versions.
--
Jim C. Nasby, Sr. Engineering Consultant jnasby(at)pervasive(dot)com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
From | Date | Subject | |
---|---|---|---|
Next Message | Jim Nasby | 2006-06-17 19:53:03 | Re: SAN performance mystery |
Previous Message | Jim Nasby | 2006-06-17 19:25:14 | Re: Precomputed constants? |