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A novel extension to external double hashing providing significant reduction to both successful and unsuccessful search lengths is presented. The experimental and analytical results demonstrate the reductions possible. This method does not restrict the hashing table configuration parameters and utilizes very little additional storage space per bucket. The runtime performance for insertion is slightly greater than for ordinary external double hashing.Hashing is a well-known data indexing technique for organizing data stored externally. Numerous schemes exist for handling collisions such as open-addressing; each record determines the probe sequence used to store or retrieve it.
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