专家级Oracle数据库架构：9i 10g 11g编程技术与解决方案

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"Expert Oracle Database Architecture 2nd Ed" 是一本由 Tom Kyte 撰写的关于 Oracle 数据库架构的专业书籍，主要涵盖了 Oracle 9i、10g 和 11g 的编程技术和解决方案。这本书得到了 Jonathan Lewis 和 Ken Jacobs（也被称作 "Dr.DBA"）的推荐。在 Oracle 数据库领域，Tom Kyte 被公认为是权威专家，他的著作深入浅出地解释了如何充分利用 Oracle 技术。书中倡导的理性方法论和以实例证明的理念，能够帮助读者成为更好的技术思考者。第一版就受到了高度评价，被认为是每一位 Oracle 用户必备的重要参考书之一。专家们对本书的赞誉表明，它包含了许多关于 Oracle 技术的深度见解。例如，Ken Jacobs 认为这本书将帮助读者更好地利用 Oracle 技术，并推崇 Tom Kyte 的实践证明方法可以提升技术思维能力。另一位专家 Sean Hull 也称赞这本书充满了丰富的 Oracle 技术洞察。在 "Expert Oracle Database Architecture" 第二版中，Tom Kyte 继续深化和更新了他对 Oracle 数据库架构的理解，涵盖了从基础到高级的编程技巧和解决方案。读者可以期待了解到如何优化数据库性能、管理事务处理、设计高效的数据模型、使用存储过程和触发器、理解并发控制机制如行级锁定和多版本并发控制（MVCC），以及如何应对数据库扩展和高可用性挑战等内容。此外，书中可能还会探讨 Oracle 的数据存储结构、查询优化、索引策略、数据库设计最佳实践、备份与恢复策略、数据库安全和权限管理等关键主题。Tom Kyte 的写作风格通常既理论扎实又实战经验丰富，因此读者不仅可以学习到理论知识，还能获得解决实际问题的方法和技巧。 "Expert Oracle Database Architecture 2nd Ed" 是一本面向高级数据库管理员、开发人员和系统架构师的宝贵资源，对于那些希望深入理解 Oracle 数据库内部运作、提升数据库性能和管理效率的人来说，是一本不可或缺的参考书籍。

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■ CONTENTS

xiv

■ Chapter 12: Datatypes......................................................................................493

An Overview of Oracle Datatypes ................................................................................493

Character and Binary String Types..............................................................................496

NLS Overview .....................................................................................................................................496

Character Strings................................................................................................................................499

Binary Strings: RAW Types ..........................................................................................506

Number Types..............................................................................................................508

NUMBER Type Syntax and Usage .......................................................................................................510

BINARY_FLOAT/BINARY_DOUBLE Type Syntax and Usage.................................................................513

Non-native Number Types..................................................................................................................514

Performance Considerations ..............................................................................................................514

Long Types ..................................................................................................................516

Restrictions on LONG and LONG RAW Types ......................................................................................516

Coping with Legacy LONG Types ........................................................................................................518

Dates, Timestamps, and Interval Types.......................................................................523

Formats ..............................................................................................................................................523

DATE Type ..........................................................................................................................................525

TIMESTAMP Type................................................................................................................................531

INTERVAL Type ...................................................................................................................................538

LOB Types....................................................................................................................541

Internal LOBs ......................................................................................................................................541

BFILEs.................................................................................................................................................552

ROWID/UROWID Types .................................................................................................554

Summary .....................................................................................................................555

■ Chapter 13: Partitioning...................................................................................557

Partitioning Overview ..................................................................................................557

Increased Availability .........................................................................................................................558

Reduced Administrative Burden .........................................................................................................560

Enhanced Statement Performance.....................................................................................................564

■ CONTENTS

Table Partitioning Schemes.........................................................................................566

Range Partitioning ..............................................................................................................................567

Hash Partitioning ................................................................................................................................569

List Partitioning ..................................................................................................................................574

Interval Partitioning ............................................................................................................................575

Reference Partitioning........................................................................................................................581

Composite Partitioning .......................................................................................................................586

Row Movement...................................................................................................................................588

Table Partitioning Schemes Wrap-up.................................................................................................590

Partitioning Indexes.....................................................................................................591

Local Indexes vs. Global Indexes........................................................................................................592

Local Indexes......................................................................................................................................593

Global Indexes ....................................................................................................................................599

Partitioning and Performance, Revisited .....................................................................612

Auditing and Segment Space Compression.................................................................618

Summary .....................................................................................................................619

■ Chapter 14: Parallel Execution.........................................................................621

When to Use Parallel Execution ...................................................................................622

A Parallel Processing Analogy ............................................................................................................623

Oracle Exadata.............................................................................................................624

Parallel Query ..............................................................................................................624

Parallel DML.................................................................................................................630

Parallel DDL .................................................................................................................633

Parallel DDL and Data Loading Using External Tables........................................................................634

Parallel DDL and Extent Trimming......................................................................................................636

Parallel Recovery.........................................................................................................645

Procedural Parallelism.................................................................................................645

Parallel Pipelined Functions ...............................................................................................................646

Do-It-Yourself Parallelism ..................................................................................................................649

■ CONTENTS

xvi

Old School Do-It-Yourself Parallelism ................................................................................................652

Summary .....................................................................................................................656

■ Chapter 15: Data Loading and Unloading.........................................................657

SQL*Loader..................................................................................................................657

Loading Data with SQLLDR FAQs........................................................................................................661

SQLLDR Caveats .................................................................................................................................686

SQLLDR Summary ..............................................................................................................................686

External Tables ............................................................................................................686

Setting Up External Tables .................................................................................................................687

Dealing with Errors.............................................................................................................................693

Using an External Table to Load Different Files..................................................................................696

Multiuser Issues .................................................................................................................................696

External Tables Summary...................................................................................................................697

Flat File Unload............................................................................................................698

Data Pump Unload .......................................................................................................706

Summary .....................................................................................................................708

■ Chapter 16: Data Encryption ............................................................................709

Types of Encryption .....................................................................................................709

Data in Motion ....................................................................................................................................709

Data at Rest ........................................................................................................................................710

Manual Application Encryption...........................................................................................................713

The Oracle Wallet ...............................................................................................................................714

Transparent Column Level Encryption................................................................................................717

Transparent Tablespace Encryption ...................................................................................................719

What Encryption Is Not About ......................................................................................722

Implementing Manual Application Encryption .............................................................723

Reasons to Avoid the Manual Approach .............................................................................................723

Performance Implications of the Manual Approach ...........................................................................724

When to Use the Manual Approach ....................................................................................................729

■ FOREWORD FROM THE FIRST EDITION

xviii

Foreword

I first met the Oracle RDBMS some time in 1988, or possibly 1987, when my manager dumped a small

box on my desk and said something like: “There’s this new product called Oracle just coming into the

country. Play around with it for a few weeks and then tell us what it’s good for.”

The version was something like 5.0.22, and in those days it was a lot easier getting started with

Oracle. The entire printed manual set—including Forms 2.0, SQL*Report, and everything else—would fit

into a small briefcase and the documentation for the create table statement ran to about three pages.

If you check the PDF file for the 11.2 SQL reference manual, you’ll find that create table currently

starts at page 16-6 and runs on to page 16-79 for a total of 74 pages. The last time I checked the total page

count was for 9i, and that was more than 20,000 pages—and I doubt if the number has dropped in 10g

and 11g.

With three (fairly slim) manuals for 5.0.22, it didn’t take me very long to learn about everything that

Oracle was supposed to do and how to do it efficiently. There weren’t many options, so there weren’t

many ways to do things wrong. But how do you get started today when the core of Oracle is hidden

under a huge mass of options and features? Worse, the details you really need to understand are covered

by a mountain of information that is nice to have, but not critical to getting started.

The answer is simple.

Step 1: Read the concepts manual so you have an idea of what it’s all about.

Step 2: Read Tom Kyte’s book so that you can follow a rational progression of learning and

experimenting that leads you from your first “select ‘hello world’ from dual” to the day when you can

confidently say things like “we should use a range partitioned IOT with these columns in the overflow for

this table because … .”

Tom combines three things in this book: a conversational style that makes it easier to read about

technical details and understand the “why” behind the “how”; a structured “storyline” so that you see

the text building towards a target rather than scattering a disjointed collection of random tips; and an

array of carefully constructed demonstrations that teach you how things work and how you should work

and think.

Consider just one example, indexing. There are many types of indexes, so we need a brief

introduction to separate the different types. It’s good to have an idea of how B-tree indexes (for example)

actually work so that we can understand their strengths and weaknesses. Then we can move on to the

idea of function-based indexes—indexes on “data that don’t really exist.” This gets us to the point of

understanding what Oracle can do, but we can (and do) go further with what we can do with Oracle. So

we see how we can put the pieces together to create an index that guarantees uniqueness across subsets

of the data, we see how we can—on a huge data set—create a tiny, low-maintenance index that identifies

exactly the data that we really want to access and minimizes the risk of the optimizer producing a silly

execution plan.

In principle, it’s all in the manuals, but only if we have the insight to take the naked descriptions of

the available commands and see how we can use them to construct solutions to real problems. Tom Kyte

supplies that insight, and then encourages you to go further in developing your own insights.

Frankly, if every DBA and developer in the world were made to work carefully through Tom Kyte’s

book, I’d probably have to start offering consultancy services to SQL Server users because the number of

clients needing Oracle consultancy would drop dramatically.

Jonathan Lewis

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