You may get an error on your Magento site, something like this,

“Fatal error: Allowed memory size of 33554432 bytes exhausted”

This is because of the PHP Memory Limit.

Here is how to fix.

1. Goto your website root from FTP.
2. You will see a file called php.ini.sample
3. Rename it to php.ini
4. Edit that file .
5. Paste this code there,

   disable_functions =
   memory_limit = 384M
   extension=pdo.so
   extension=pdo_mysql.so
   extension=pdo_sqlite.so