FOR UPDATE SKIP LOCKED;

Oracle 11g introduced SKIP LOCKED clause to query the records from the table which are not locked in any other active session of the database.

http://viralpatel.net/blogs/oracle-skip-locked/

http://markjbobak.wordpress.com/2010/04/06/unintended-consequences/

http://www.dba-oracle.com/t_select_update_skip_locked.htm

http://sqlplsql.wordpress.com/2012/08/28/iterative-update-with-skip-locked-option/

http://www.ateam-oracle.com/db-adapter-distributed-polling-skip-locked-demystified/

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