Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 64 b

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 64 bytes) in D:\wamp\www\stjude\system\database\DB_result.php on line 295.
I got this error when run my application. i have more data in my database.

how to retrieve the data from database using model. I use foreach loop more and more function.
i used more regular queries

for eg:
$query = $this->db->query('YOUR QUERY HERE');


Thnaks for advance and quick reply...

Its very urgent