Often when I try to add something to my cart or try to checkout I get the following error:
Fatal error: Out of memory (allocated 247463936) (tried to allocate 261900 bytes) in /home/users/domain/domain.com/webshop/lib/Zend/Db/Select.php on line 421
This only just started today on two Magento webshops I'm working on.
I've done some research on the error - the memory_limit in .htaccess of Magento was already set to 256M. I've tried commenting this out and keeping it on and also been checking out the php_info(); function and this says that memory_limit is set to 256M.
This error is getting quite frustrating so help would be appreciated.
Instead of changing your memory limit in htaccess you should do it in in the php ini file.
Look for this line: php_value memory_limit
If you are on a shared host, you may find that they have to help you with this. If you are on a shared host, good luck :) I've found running a shopping cart was nightmare on every shared host I've ever tried it on. Worth the extra bit a month for a VPS at least.