Clean up CodeIgniter's database (ActiveRecord) memory usage

As what I have found when I was researching there are 2 ways:

• Prevent ActiveRecord from saving query

by

$this->db->save_queries = false;

credit: how can I free the memory used by $this->db->insert()

• Free result memory - CodeIgniter will only reclaim memory when http query processing was returned. If you request is long, you have to free by yourself

by

$query = $this->db->query('SELECT title FROM my_table');
$query->free_result();

credit: last section of Generating Query Results