| 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 |
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| 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
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