Re: 8.2.4 signal 11 with large transaction

From: Bill Moran <wmoran(at)collaborativefusion(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: 8.2.4 signal 11 with large transaction
Date: 2007-07-20 17:17:04
Message-ID: 20070720131704.f76af31d.wmoran@collaborativefusion.com
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In response to Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:

> Bill Moran <wmoran(at)collaborativefusion(dot)com> writes:
> > I'm now full of mystery and wonder. It would appear as if the
> > underlying problem has something to do with PHP, but why should this
> > cause a backend process to crash?
>
> I'd bet on PHP submitting the query via extended query protocol
> (PQexecParams or equivalent) instead of plain ol PQexec which is what
> psql uses.

Doesn't appear that way. The PHP source is somewhat cryptic, but I
don't seem much ambiguity here:

pgsql_result = PQexec(pgsql, Z_STRVAL_PP(query));

There're no conditional blocks around that, so it's the only possible
choice when pg_query() gets called in a PHP script. PHP exposes a
seperate pg_query_params() that wraps PQexecParams().

> I don't speak PHP or have it installed here, so this example
> is hard for me to investigate. Can someone make a reproducer that uses
> PQexecParams?

Is there any way that this (or something similar) could still apply?

--
Bill Moran
Collaborative Fusion Inc.
http://people.collaborativefusion.com/~wmoran/

wmoran(at)collaborativefusion(dot)com
Phone: 412-422-3463x4023

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