Inconsistent query results...

Hello all,

I am experiencing a somewhat strange behavior with Postgres.  I am running 7.0
beta 5 on Linux Slackware, and connecting to Postgres through php with the pg_*
function set.  Everything seems to work fine, however A particular query fails
about 10% of the time.

The query is a simple two-way join:

select xapctl_https_dom.ssl_hostname, xapctl_dom.dom_id, xapctl_dom.prefix
from xapctl_https_dom, xapctl_dom
where xapctl_https_dom.ssl_hostname = 'blackbox.xapnet.com'
and xapctrl_https_dom.dom_id = xapctl_dom.dom_id

(For the curious, I this PHP program is performing virtual
host resolution using the database... this simple join should verify that the
hostname requested exists.)

Problem is, after using pg_numrows to determine how many rows were selected, it
returns 0 about 5-10% of the time.  Weird, isn't it?  When this happens the
PHP script will return an error stating "hostname could not be resolved", as
it should.

My PHP script uses a debugging log so I can check the full text of
the query everytime it executes, and it is always correct.  Also it is set up so
that if the query returns an error it will display a different error message
with the contents of the query.

I also vacuum and vacuum analyze the database on a regular basis.

To make a shot in the dark, I tried putting a 1/10th of a second delay before
making the call to pg_numrows() but that did nothing.

Does anyone have an idea as to how I might be able to track down the problem
(or should I upgrade to RC1?)..


Thanks,
-Andy