Consider stored as a randomly ordered file for which
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files stored on Storage Elements and a Resource Broker controls the scheduling of jobs ... LFNs is ordered, forming a list of successive requests), random (files are selected randomly ...
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Consider a relation stored as a randomly ordered file for which the only index is an unclustered index on a field called sal. If you want to retrieve all records with sal> 20, is using the index always the best alternative.
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