Algorithm 8.1: Parallel Nested Loop (PNL)Input: R₁, R2, . . . , Rm: fragments of relation RS1, S2,..., Sn: fragments of relation S;JP: join predicateOutput: T1, T2, ..., Tn: result fragmentsbeginendfor i from 1 to m in parallel dosend R; to each node containing a fragment of Send forfor j from 1 to n in parallel doR ← U₁1 R₁;TjRAJP Sjend for{send R entirely to each S-node}{perform the join at each S-node}{R; from R-nodes; R is fully replicated at S-nodes} 366Node 1R₁R₁R2XNode 3S1R₁8 Parallel Database SystemsNode 2R2R2Fig. 8.11 Example of parallel nested loopXNode 4S₂

The given code is a parallel implementation of the relational algebra operation of join. The join…

Algorithm 8.1: Parallel Nested Loop (PNL) Input: R₁, R₂, ..., Rm: fragments of relation R S1, S2,..., Sn: fragments of relation S; JP: join predicate Output: T1, T2,..., Tn: result fragments begin end for i from 1 to m in parallel do | send R; to each node containing a fragment of S end for for j from 1 to n in parallel do R←UR₁; i=1 TjRAJP Sj end for {send R entirely to each S-node} {perform the join at each S-node} {R; from R-nodes; R is fully replicated at S-nodes}

Algorithm 8.1: Parallel Nested Loop (PNL) Input: R₁, R₂, ..., Rm: fragments of relation R S1, S2,..., Sn: fragments of relation S; JP: join predicate Output: T1, T2,..., Tn: result fragments begin end for i from 1 to m in parallel do | send R; to each node containing a fragment of S end for for j from 1 to n in parallel do R←UR₁; i=1 TjRAJP Sj end for {send R entirely to each S-node} {perform the join at each S-node} {R; from R-nodes; R is fully replicated at S-nodes}

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter3: Data Representation

Section: Chapter Questions

Problem 1PE

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