explain with placeholders?

[Dan Sugalski]

Is there any way to convince explain to go do its thing when given a
query with placeholders in it?

I'm trying to do some performance checking of some of the queries
built into a system I'm building. The SQL's all done with
placeholders, for safety and ease of twiddling, but EXPLAIN...
EXPLAIN doesn't like them. Trying throws an "ERROR: there is no
parameter $1" which is somewhat sub-optimal.

Any way, short of hand-replacing the placeholders with real values
(which makes me nervous since the optimizer may do things that
wouldn't be doable in the system when it was running), to get a
meaningful check on these things?
--
Dan

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Dan Sugalski even samurai
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[Tom Lane]

Dan Sugalski <da*@sidhe.or g> writes:

Is there any way to convince explain to go do its thing when given a
query with placeholders in it?

PREPARE foo(...) AS SELECT ...

EXPLAIN EXECUTE foo(...)

EXPLAIN EXECUTE is a relatively recent addition, but I'm sure it's in
7.4 at least.

regards, tom lane

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[Dan Sugalski]

At 10:39 AM -0400 9/7/04, Tom Lane wrote:

Dan Sugalski <da*@sidhe.or g> writes:

Is there any way to convince explain to go do its thing when given a
query with placeholders in it?

PREPARE foo(...) AS SELECT ...

EXPLAIN EXECUTE foo(...)

EXPLAIN EXECUTE is a relatively recent addition, but I'm sure it's in
7.4 at least.

Ah, cool. Thanks.
--
Dan

--------------------------------------it's like this-------------------
Dan Sugalski even samurai
da*@sidhe.org have teddy bears and even
teddy bears get drunk

---------------------------(end of broadcast)---------------------------
TIP 4: Don't 'kill -9' the postmaster