dan@sidhe.org escribió:
dan@sidhe.org escribió:
where libinstance.libdate <= 1238445044
and libinstance.enddate > 1238445044
and libinstance.libinstanceid = libobject.libinstanceid
and libinstance.architecture = ?
How are you generating the explain? My bet is that you're just
substituting a literal in the architecture condition, but if the driver
is smart then maybe it's preparating the query beforehand. You'll get a
different plan in that case.
I don't think so. Perl's DBI is involved, but the statement's in a
variable.
So what's the "?" in the query you pasted earlier?
The first ? (for architecture) is 1, the second ? (for branchid) is 0.
They both should get passed to Postgres as $1 and $2, respectively,
assuming DBD::Pg does its substitution right. (They're both supposed to go
in as placeholders)

-Dan

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grouppgsql-performance @
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postedMar 30, '09 at 5:57p
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