QueryLocator

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In the QueryResult object returned by the query call, the queryLocator field contains a QueryLocator object that you will use in a subsequent queryMore call. Note that:

You use a given QueryLocator only once. Each time you pass it in a queryMore call, the server returns a new QueryLocator in the QueryResult.
QueryLocator objects expire automatically after 15 minutes of inactivity.

A QueryLocator represents a server-side cursor. A salesforce.com account can have up to five (5) query cursors open at a time. If five QueryLocator cursors are opened when a client application attempts open a new one, then the oldest of the five cursors is released.