[mod_python] ModPython, Psycopg postgresql gives segmentation fault

Justin Ryan jryan at qutang.net
Mon Nov 29 20:31:10 EST 2004

What exactly are you storing in the session?

Under what conditions do you avoid a database hit, specifically?

Is it necessary to avoid a database hit during authenhandler, since you 
are probably going to hit the db again later?  It would probably help 
to keep your code from creating a new db connection after 
authenticating, but it seems logical that you will need one at some 
point during most requests (unless you are using postgres only for 


On Nov 29, 2004, at 12:56 PM, java_dev wrote:

> Hi,
> Some config stuff is puzzeling me. I have a site running with 
> mod_python 3.1.3, apache 2.0.49, psycopg 1.99.10 and postgres 7.4.2
> On my developmentmachine the only real difference is that I'm using 
> postgresql 7.4.5
> I get a segmentation fault when using authentication using a database. 
> Strange because writing this email made me try switching the 
> authenhandler of to see if the rest was also crashing but that part is 
> working ok.
> So the Segmentation Fault is caused by the AuthenHandler using the 
> database.
> Further research showed that nothing is wrong with the database but I 
> have trouble with the Session part of the authentication.
> I store a uservalue in the Session which I check and on my 
> productionserver is gives a crash and on my development machine it 
> works well.
> The reason i store a value in the session is that the 
> AuthenticationHandler every request a call to the database makes. I 
> tried to prevent that behaviour.
> If someone can give me a pointer how to prevent the Session from 
> creating segmentation Faults please let me know. And if there is 
> another way for preventing the authenicationhandler from being called 
> all the time please let me know
> Thanks
> Johan
> -- 
> Nilling Software Design
> Postbus 43
> 2280 AA  Rijswijk ZH
> w: http://www.nilling.nl
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