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Re: I: About "Our CLUSTER implementation is pessimal" patch

From: Itagaki Takahiro <itagaki(dot)takahiro(at)gmail(dot)com>
To: Leonardo Francalanci <m_lists(at)yahoo(dot)it>
Cc: Josh Kupershmidt <schmiddy(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: I: About "Our CLUSTER implementation is pessimal" patch
Date: 2010-09-01 09:51:16
Message-ID: (view raw or whole thread)
Lists: pgsql-hackers
On Tue, Aug 31, 2010 at 8:04 PM, Itagaki Takahiro
<itagaki(dot)takahiro(at)gmail(dot)com> wrote:
> * How to determine which method was used?
>  We can get some information from trace_sort logs,
>  but CLUSTER VERBOSE would be better to log
>  which CLUSTER method was used.

I wrote a patch to improve CLUSTER VERBOSE (and VACUUM FULL VERBOSE).
The patch should be applied after sorted_cluster-20100721.patch .

* clustering "schema.table" by index scan on "index"
* clustering "schema.table" by sequential scan and sort

It also adds VACUUM VERBOSE-like logs:
INFO:  "table": found 1 removable, 100001 nonremovable row versions in
1655 pages
DETAIL:  1 dead row versions cannot be removed yet.
CPU 0.03s/0.06u sec elapsed 0.21 sec.

Note that the patch says nothing about reindexing. But if
required, I'm willing to add some VERBOSE messages for
indexes (ex. REINDEX VERBOSE)

Itagaki Takahiro

Attachment: cluster_verbose-20100901.patch
Description: application/octet-stream (9.2 KB)

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