Grzegorz Jaskiewicz wrote:


On Mar 19, 2007, at 11:16 AM, Heikki Linnakangas wrote:

Grzegorz Jaskiewicz wrote:
On Mar 16, 2007, at 10:12 PM, Heikki Linnakangas wrote:
You'll obviously need to run it with the patch applied. I'd suggest to enable stats_block_level to see the effect on buffer cache hit/miss ratio.
groupeditems-42-pghead.patch.gz is enough, or it needs maintain_cluster_order_v5.patch ??

No, it won't make a difference unless you're inserting to the table, and the inserts are not in cluster order.
well, that's okay than. I see really good improvement in terms of speed and db size (which reflects obviously in i/o performance). Let me know if further testing can be done. I would happily see it in mainline.

If you have a real-world database you could try it with, that would be nice. The test I sent you is pretty much a best-case scenario, it'd be interesting to get anecdotal evidence of improvements in real applications.

--
  Heikki Linnakangas
  EnterpriseDB   http://www.enterprisedb.com

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