this is more of a discussion post than a response:
On Aug 5, 2006, at 10:02 AM, Mark Stosberg wrote:
do you have links of that in regards to dbd::pg? i didn't realize
they supported it.
However, when deploying it on mod_perl on a busy website, I quickly
saw a lot of this kind of error:
prepared statement "dbdpg_7" already exists
from my experience with psycopg ( python pg interface ) it is the
persistant connection issue. obviously , you're trying to prepare a
statement that has already been allocated. but i'm wondering how/why
that's happening.
I found a related mention of this issue here:
http://fudforum.org/forum/index.php?t=msg&th=4598&start=0&;
There the fix involved putting using DEALLOCATE when persistent
first, the patch with DEALLOCATE makes prepared statements entirely
useless, as it means you're caching a prepared statement, running it,
then deallocating it immediately afterwards. thats some brilliant
php right there. why didn't they just do a conditional to never
prepare on persistant connections ?
before looking into how dbd::pg is internally handling the prepared
statements, are you using some sort of db abstraction layer like rose
or class::dbi. or are you executing directly? if executing
directly, are you creating statement handles on the outset, or are
you just letting dbdpg handle all of that internally?
the prepared statement 'handle/name' is private to the session. so
two different connections will each have their own statement handle.
my guess on things to look into:
how is dpd::pg caching the statement handle? are they even doing it?
where is the statment handle being cached, accessed, checked? in
the memory space of the child, or in the shared area?
// Jonathan Vanasco
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