memory_limit problem in opencart or anyother website

error:-

Fatal error: Allowed memory size of 138412032 bytes exhausted (tried to allocate 71 bytes) in /home/xxxxxxx/public_html/xxxxxxxxxxxx/vqmod/vqcache/vq2-system_engine_controller.php on line 79


simple solution:-

<?php ini_set('memory_limit', '-1'); ?>

write this code on config.php in first line.its unlimited.

simple way to Create two primary key in one table(composite key)

simple way to Create two primary key in one table(composite key)

but auto increment only one coulmn to assign.
code:-
ALTER TABLE provider DROP PRIMARY KEY, ADD  PRIMARY KEY(person, place, thing);