Re: Allow pooled connections to list all prepared queries

From: David Brown <brownda(at)cs(dot)earlham(dot)edu>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: PostgreSQL Global Development Group <pgsql-patches(at)postgresql(dot)org>, Charlie Peck <charliep(at)cs(dot)earlham(dot)edu>
Subject: Re: Allow pooled connections to list all prepared queries
Date: 2004-12-24 20:34:29
Message-ID: 20041224203429.GA950@lan.spoonguard.org
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Hi Tom:

On Fri, Dec 24, 2004 at 11:00:57AM -0500, Tom Lane wrote:
>> * Extended PostgreSQL's SQL grammar to capture the original SQL query
>> string for PREPARE statements.
>
>This seems much the ugliest and most invasive part of the patch. I'd
>suggest doing something similar to what pg_proc.c is doing:

I agree. At the time I did this, I was working against the 7.4.5 release
(which, as far as I can tell, doesn't have ActivePortal defined anywhere).
I'll try your approach on a CVS snapshot.

>> * Modified backend/commands/prepare.c to keep some additional
>> statistics in the prepared statement hash table (plan creation time,
>> execution count, etc.)
>
>The usefulness of this seems pretty dubious. You aren't going to have a

>> * Added an accessor function to allow for "raw" access to the prepared
>> statement hash table (necessary for sequential access).
>
>It would have been better to put the function that needs this access
>into prepare.c. There is no point in trying to hide a data structure
>inside a module if we then turn around and expose the data structure
>to the world...

I'll split the exec_count/gettimeofday stuff out into a separate patch, and
find a way to eliminate FetchPreparedStatementHtab().

Thanks,

- Dave

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