On 23/06/10 18:17, Leonardo F wrote:
in bufpage.h:
"all blocks written out by an access method must be disk pages"
but in
http://www.postgresql.org/docs/8.4/static/storage-page-layout.html
"Actually, index access methods need not use this page format. All the
existing index methods do use this basic format, but the data kept on
index metapages usually doesn't follow the item layout rules."
I'm not getting it: am I supposed to use the "disk page format" when
writing an index access method, or it's just a "good practice" because
it makes the handling easier? Given the docs it looks "recommended",
but the comment on the code sounds more "mandatory".
It's recommened because it makes life easier. Even if you don't use the
normal page format, I think you need to have the LSN at the beginning of
the page. The rest is up to you.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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