Database Architecture

The Oracle Architecture is composed of several layers that work together to provide a robust, scalable database system. At the core is the Oracle Database, which relies on a multi-tiered architecture for storage and management of data. Key components include the Instance, which is made up of memory structures like the System Global Area (SGA) and background processes like the Database Writer. The Database Storage layer handles physical data files, and the User Layer interacts with the system through SQL queries and applications. The architecture is designed to optimize performance, scalability, and security, ensuring data integrity and high availability.

Oracle的进程结构是Oracle数据库体系架构中的关键组成部分。用户端发出SQL命令后，Oracle的服务器进程负责接收并处理请求。通过内存区域进行精细的语法分析、编译和执行，最后将数据写入数据文件，并将数据库修改信息记录到日志文件。最终，执行结果被返回至客户端。

Oracle Database 12c Architecture is designed to enhance scalability and flexibility. It introduces multitenant architecture, allowing multiple databases (pluggable databases) to run within a single container. This enables better resource management and consolidation. Additionally, features like automatic data optimization and in-memory processing provide improved performance and efficiency.

Expert Oracle Database Architecture is a masterpiece created by Oracle's global engineers. This work showcases advanced techniques and insights into the design, implementation, and optimization of Oracle databases. The architecture emphasizes scalability, high availability, and efficient performance across various environments. With its intricate details, this guide provides professionals with the knowledge needed to architect and manage Oracle databases in enterprise-level systems.

Toms Kyte的《Oracle9i&10g编程艺术》的第二版

This book is aimed at those people who appreciate the choice but would also like some guidelines and practical implementation details on Oracle features and functions.

Oracle基础电子书，学习的好材料，适应于Oracle开发人员。书中详细介绍了数据库体系结构，帮助读者深入理解Oracle的工作原理和最佳实践。

About This Book The MindShare Architecture Series....1Organization of This Book.....2Part One – The EISA Specification....2- EISA Overview.....2- EISA Bus Structure Overview.....2- EISA Bus Arbitration.....2- Interrupt Handling.....2- Detailed Description of EISA Bus.....3- ISA Bus Cycles...3- EISA CPU and Bus Master Bus Cycles.....3- EISA DMA....3- EISA System Configuration.....3Part Two – The Intel 82350DT EISA Chipset.....3- EISA System Buses.....3- Bridge, Translator, Pathfinder, Toolbox...3- Intel 82350DT EISA Chip Set...4Who This Book Is For.....4Prerequisite Knowledge...4Documentation Conventions....4- Hex Notation....5- Binary Notation....5- Decimal Notation....5- Signal Name Representation.....5- Bit Field Identification (logical bit or signal groups)....5We Want Your Feedback.....6Bulletin Board...6Mailing Address....6 Part One – EISA Specification Chapter 1: EISA OverviewIntroduction...9- Compatibility With ISA...10- Memory Capacity...10v EISA System ArchitectureSynchronous Data Transfer...

检查点进程（CKPT）负责：在检查点时调用DBWn，用检查点信息修改数据文件头和控制文件。流程如下：1. 将指定内容和标题进行格式化。2. 相关词加粗。 Instance SGADBWnLGWRCKPT ———做什么都比什么也不做强———控制文件数据文件重做日志文件数据库

POSA2是POSA系列的第二卷，于2000年出版。POSA2中的17个模式构成了一个模式语言，涵盖了与并发和网络相关的各种问题。这些模式包括服务访问和配置、事件处理、同步和并发等核心元素。所有模式均提供了丰富的示例，并展示了在多种编程语言（包括C++、C和Java）中的应用。