Query Plan Generation using Particle Swarm Optimization

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This document discusses using particle swarm optimization to generate query plans in a distributed database system. It notes that joins are an important operation but generating all possible query plans leads to exponential growth. Particle swarm optimization is proposed to produce low-cost query plans by modeling query planning as particles that track the best solutions. The approach breaks queries into local subqueries, executes them in parallel, and combines results to reduce data transfer and response times compared to alternative algorithms like genetic algorithms. The goal is to optimize query performance by selecting plans with minimum processing costs.

Education

Generation of Query Plan
using Particle Swarm
Optimization Algorithm
SUBMITTED BY-
AKSHAY JAIN
9911103421

Introduction
 A database is a collection of data.
 A database management system (DBMS) is a set of
software that are used to define, store, manipulate
and control the data in a database.

Problem Statement
 Across the globe large number of queries are
generated. In order to process these queries
efficiently, optimal strategies are used.
 Join operation is the most important operation in
database.
 In distributed Relation database systems, there is
replication of data at multiple sites and every
relation has to answer a query.

 This leads to data accessing from multiple sites
which increases the size of database which further
increases the number of joins.
 This leads to exponential increase in query plans.
 So distributed query plan generation technique
generates the best possible and the most cost-
effective option for query plan.

 To produce the most cost effective query plan using
one of the soft computing techniques which are -
1. Particle Swarm Optimization
2. Ant Colony Algorithm
3. Genetic Algorithm

Logic Used
Distributed
query
(parsing)
Local sub
queries
Execution at
respective
sites
Final result

Amount of data
transfer between
sites reduces
Cost reduces
Response time
reduces

Genetic Algorithm
 GA generates a population of chromosomes where each
chromosome represents a query plan.
 The fitness value of each chromosome in the
population, using the fitness function, is evaluated.
 The fitter individuals are then selected for crossover
and mutation.
 GA explores the entire solution space of chromosomes.

Particle Swarm Optimization
 Population based stochastic optimization
technique.
 SCALABLE
 FLEXIBLE
 ROBUST
 PSO uses a population of individuals, to search
feasible region of the function space. In this context,
the population is called swarm and the individuals
are called particles.

 It uses number of particles that constitute a swarm. Each
particle keeps a track of its coordinates and the best solution it
has achieved so far is called pbest.
 It also keeps track of neighbourhood particle and it’s best
value which is called gbest.
 PSO accelerates each particle to pbest and gbest and find
best path and hence minimum cost.

 Particle swarm optimization (PSO) is a computational
method that optimizes a problem by iteratively taking
particle's position and velocity and using mathematical
formulae.
 This is expected to move the swarm toward the best
solutions.
 Experimental comparisons of this algorithm with the GA
based distributed query plan generation algorithm shows
that for higher number of relations, the PSO based
algorithm is able to generate comparatively better
quality query plans.

• Select plans with minimum query processing cost

Objectives Achieved
 Generated the most effective query plan for a
distributed relational query using the concept that a
distributed query is broken down into local sub-queries
which are executed at their respective sites and then
the final integrated result is provided as the answer.
 Reduced the the total query processing cost (TC) which
comprises of Total Processing Cost (TPC) and Total Site-
to-Site Communication Cost (TCC).

A large number of queries are been posed daily on databases spread across the globe. In order for processing these queries efficiently, the best strategies to generate plans are being devised. In distributed relational database systems, due to replica of relations at different sites, the relations required to answer a query might necessitate accessing of data from many different sites. This leads in exponential increase in the number of possible alternative query plans to process a query. Though it is not computationally feasible for exploring all possible query plans in such a vast search space, the query plan that provides the most cost-effective option for query processing is considered to be necessary and should be generated for a given query. Here in this project of ours, an effort has been made to give best possible query plans using Particle Swarm Optimization (PSO), Genetic Algorithm (GA) and other soft computing techniques. Experimental comparisons of this algorithm with the GA based distributed query plan generation algorithm and it proves that for more number of relations, PSO based algorithm is able to generate better query plans.

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Query Plan Generation using Particle Swarm Optimization

1. Generation of Query Plan using Particle Swarm Optimization Algorithm SUBMITTED BY- AKSHAY JAIN 9911103421

2. Introduction  A database is a collection of data.  A database management system (DBMS) is a set of software that are used to define, store, manipulate and control the data in a database.

3. Problem Statement  Across the globe large number of queries are generated. In order to process these queries efficiently, optimal strategies are used.  Join operation is the most important operation in database.  In distributed Relation database systems, there is replication of data at multiple sites and every relation has to answer a query.

4.  This leads to data accessing from multiple sites which increases the size of database which further increases the number of joins.  This leads to exponential increase in query plans.  So distributed query plan generation technique generates the best possible and the most cost- effective option for query plan.

5.  To produce the most cost effective query plan using one of the soft computing techniques which are - 1. Particle Swarm Optimization 2. Ant Colony Algorithm 3. Genetic Algorithm

6. Logic Used Distributed query (parsing) Local sub queries Execution at respective sites Final result

7. Amount of data transfer between sites reduces Cost reduces Response time reduces

8. Genetic Algorithm  GA generates a population of chromosomes where each chromosome represents a query plan.  The fitness value of each chromosome in the population, using the fitness function, is evaluated.  The fitter individuals are then selected for crossover and mutation.  GA explores the entire solution space of chromosomes.

9. Particle Swarm Optimization  Population based stochastic optimization technique.  SCALABLE  FLEXIBLE  ROBUST  PSO uses a population of individuals, to search feasible region of the function space. In this context, the population is called swarm and the individuals are called particles.

10.  It uses number of particles that constitute a swarm. Each particle keeps a track of its coordinates and the best solution it has achieved so far is called pbest.  It also keeps track of neighbourhood particle and it’s best value which is called gbest.  PSO accelerates each particle to pbest and gbest and find best path and hence minimum cost.

11.  Particle swarm optimization (PSO) is a computational method that optimizes a problem by iteratively taking particle's position and velocity and using mathematical formulae.  This is expected to move the swarm toward the best solutions.  Experimental comparisons of this algorithm with the GA based distributed query plan generation algorithm shows that for higher number of relations, the PSO based algorithm is able to generate comparatively better quality query plans.

12.

13. • Select plans with minimum query processing cost

14. Objectives Achieved  Generated the most effective query plan for a distributed relational query using the concept that a distributed query is broken down into local sub-queries which are executed at their respective sites and then the final integrated result is provided as the answer.  Reduced the the total query processing cost (TC) which comprises of Total Processing Cost (TPC) and Total Site- to-Site Communication Cost (TCC).

Query Plan Generation using Particle Swarm Optimization

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