explain with placeholders?
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
--------------------------------------it's like this-------------------
Dan Sugalski even samurai
dan@sidhe.org have teddy bears and even
teddy bears get drunk
Dan Sugalski <dan@sidhe.org> 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
At 10:39 AM -0400 9/7/04, Tom Lane wrote:
Dan Sugalski <dan@sidhe.org> 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
dan@sidhe.org have teddy bears and even
teddy bears get drunk