Tom Lane wrote:
Heikki Linnakangas <[EMAIL PROTECTED]> writes:
Tom Lane wrote:
but it'd make it safe to use in non-WAL contexts (I think there are
other places where we know we are going to init the page and so a
physical read is a waste of time).
Is there? I can't think of any. Extending a relation doesn't count.
No, but re-using a free page in an index does. I'm not sure which index
AMs know for sure the page is free, and which have to read it and check,
but I think there's at least some scope for that.
B-tree, GIN ans GiST read and check. I'm not sure how hash works. I
think the latest bitmap index patch doesn't support reusing empty pages
at all.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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