I have more than 20,000 contacts in my iPhone, i need to show all those contacts in the application very quickly, but i need to compare every iphone contact with my core data attribute named as "phonenumber" matched or not, For this im using "NSPredicate" for filtering quickly.
Here my quick doubt is, how can i get all contacts very quickly, when i update the contact or delete the contact from my iphone and update need update those contacts on my app simultaneously.