civicrm/civicrm-core — pull request #3764 by jmcclelland (2014-07-30 13:51:41+00:00)
Title: CRM-15060 - don't load entire contacts table when reserving for survey.

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* CRM-15060: reserving survey respondents causes wait while entire database query is executed
https://issues.civicrm.org/jira/browse/CRM-15060