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sudhakarreddysudhakarreddy 

can anybody tell me about Query cursor. And any related docs

Best Answer chosen by sudhakarreddy
Vinita_SFDCVinita_SFDC
Hello,

Cursors is equivalent of query result sets .  Cursor is a reference to the the result set for a soql query.

Select Id, name, (select Id, name from contacts) from account

Will account for 2 open cursors.

Please refer following link: http://www.interactiveties.com/b_batch_apex_invalid_query_locator.php