Service temporarily unavailable – PHP SDK-Collection of common programming errors

When ever I try to get a large data set say, I am writing an FQL something like

select first_name,last_name,age_range,sex,birthday_date,books,current_location,hometown_location,education,work,inspirational_people,interests,languages,movies,music,relationship_status,sports,tv,website,favorite_athletes,favorite_teams from user where uid in (select uid2 from friend where uid1=me())

I am getting this error. There is no problem for smaller data set. I am using facebook php sdk.

Fatal error: Uncaught Exception: 2: Service temporarily unavailable thrown in C:\xampp\htdocs\cm_test\WebContent\php-sdk\base_facebook.php on line 1254

Any help would be deeply appreciated.

Originally posted 2013-11-19 13:18:05.