《数据库系统概念 Database System Concepts》原书教学资源（第六版，PPT课件讲稿，英文版）Chapter 2 Introduction to the Relational Model

Heterogeneous and Homogeneous Databases Distributed Data Storage Distributed Transactions Commit Protocols Concurrency Control in Distributed Databases Availability Distributed Query Processing Heterogeneous Distributed Databases Directory Systems

Introduction I/O Parallelism Interquery Parallelism Intraquery Parallelism Intraoperation Parallelism Interoperation Parallelism Design of Parallel Systems

Centralized and Client-Server Systems Server System Architectures Parallel Systems Distributed Systems Network Types

Failure Classification Storage Structure Recovery and Atomicity Log-Based Recovery Remote Backup Systems

Lock-Based Protocols Timestamp-Based Protocols Validation-Based Protocols Multiple Granularity Multiversion Schemes Insert and Delete Operations Concurrency in Index Structures

Transaction Concept Transaction State Concurrent Executions Serializability Recoverability Implementation of Isolation Transaction Definition in SQL Testing for Serializability

Introduction Transformation of Relational Expressions Catalog Information for Cost Estimation Statistical Information for Cost Estimation Cost-based optimization Dynamic Programming for Choosing Evaluation Plans Materialized views

Overview Measures of Query Cost Selection Operation Sorting Join Operation Other Operations Evaluation of Expressions

Basic Concepts Ordered Indices B+-Tree Index Files B-Tree Index Files Static Hashing Dynamic Hashing Comparison of Ordered Indexing and Hashing Index Definition in SQL Multiple-Key Access