server dropping connection

[Reed Loefgren <rloef(at)interfold(dot)com>]

All,

I've been trying to run a nested query via a browser using a php script. 
The script looks at a table with a couple years worth of data (6M rows). 
If I constrain the search to five or six days of the data it works fine 
and displays the result set in the browser, but if I have it parse the 
entire table it errors out with this message:

server closed the connection unexpectedly This probably means the server 
terminated abnormally before or while processing the request.

The error points at line 33, which is the $query = "SELECT..." in the 
script.
The full table query runs fine in psql and the very limited query runs 
fine in the php script so I'm thinking there might be some type of 
resource starvation or client connection timeout happening. In psql the 
full query over two years of data returns a result set (limit 50) in about 
three minutes. Any ideas where I should begin looking?

thanks,

r