Introduction

Shared Nothing

A parallelism of shared nothing is a scheme where commodity hardware has dedicated CPU, RAM, and disk. Between machines is only a network connection.

Types of Query Parallelism

1. Inter-query Parallelism

   • Each query runs on a separate processor

2. Intra-query Parallelism

   • Each operator can be parallelized (inter-operator)

   • Within each operator, we can parallelize its components (intra-operator)