Re: I: About "Our CLUSTER implementation is pessimal" patch
Itagaki Takahiro <itagaki.takahiro@gmail.com>
From: Itagaki Takahiro <itagaki.takahiro@gmail.com>
To: Leonardo Francalanci <m_lists@yahoo.it>
Cc: Josh Kupershmidt <schmiddy@gmail.com>, pgsql-hackers@postgresql.org
Date: 2010-09-01T09:51:16Z
Lists: pgsql-hackers
Attachments
- cluster_verbose-20100901.patch (application/octet-stream) patch
On Tue, Aug 31, 2010 at 8:04 PM, Itagaki Takahiro <itagaki.takahiro@gmail.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