2008 Mysql client run out of memory !?!

Hello, I use PHP 4.0.6 with mySQL 3.23.40 and I have the error 2008 (client run out of memory) performing this query : select i2f.item_id, i2f.value, f.id from features as f, item2feature as i2f, items as i where i.scat_id = '244d713abba5f2ffb8d0ba8c858111ef' and i.id = i2f.item_id and f.id = i2f.feat_id That query works perfectly with phpMyAdmin - It returns 2 rows - and is also performed several times in the program using loops. I tried unbuffered queries but I had an error 0 (?). I think It is not the query that goes wrong but I don't understant why the mysql client run out of memory like that ! How can I find the cause of the problem ? Is there a way to see what's in the mysql client memory ? Thank you ! PS : If you want to reply me directly remove the name between brackets from the subject..