Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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Introduction The inspiration for the material contained in this book comes from my experiences developing Oracle software, and from working with fellow Oracle developers and helping them build reliable and robust applications based on the Oracle database. The book is basically a reflection of what I do every day and of the issues I see people encountering each and every day. I covered what I felt was most relevant, namely the Oracle database and its architecture. I could have written a similarly titled book explaining how to develop an application using a specific language and architecture—for example, one using JavaServer Pages that speaks to Enterprise JavaBeans, which in turn uses JDBC to communicate with Oracle. However, at the end of the day, you really do need to understand the topics covered in this book in order to build such an application successfully. This book deals with what I believe needs to be universally known to develop successfully with Oracle, whether you are a Visual Basic programmer using ODBC, a Java programmer using EJBs and JDBC, or a Perl programmer using DBI Perl. This book does not promote any specific application architecture; it does not compare threetier to client/server. Rather, it covers what the database can do and what you must understand about the way it works. Since the database is at the heart of any application architecture, the book should have a broad audience. In writing this book, I completely revised an updated the architecture sections from Expert One-on-One Oracle and added substantial new material. There have been three database releases since Oracle 8.1.7, the release upon which the original book was based: two Oracle9i releases and Oracle Database 10g Release 1, which is the current production release of Oracle at the time of this writing. As such, there was a lot of new functionality and many new features to cover. The sheer volume of new material required in updating Expert One-on-One Oracle for 9i and 10g was at the heart of the decision to split it into two books—an already large book was getting unmanageable. The second book will be called Expert Oracle Programming. As the title suggests, Expert Oracle Database Architecture concentrates on the database architecture and how the database itself works. I cover the Oracle database architecture in depth—the files, memory structures, and processes that comprise an Oracle database and instance. I then move on to discuss important database topics such as locking, concurrency controls, how transactions work, and redo and undo, and why it is important for you to know about these things. Lastly, I examine the physical structures in the database such as tables, indexes, and datatypes, covering techniques for making optimal use of them. What This Book Is About One of the problems with having plenty of development options is that it’s sometimes hard to figure out which one might be the best choice for your particular needs. Everyone wants as much flexibility as possible (as many choices as they can possibly have), but they also want things to be very cut and dried—in other words, easy. Oracle presents developers with almost xvii
xviii ■INTRODUCTION unlimited choice. No one ever says, “You can’t do that in Oracle”; rather, they say, “How many different ways would you like to do that in Oracle?” I hope that this book will help you make the correct choice. 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. For example, Oracle has a really neat feature called parallel execution. The Oracle documentation tells you how to use this feature and what it does. Oracle documentation does not, however, tell you when you should use this feature and, perhaps even more important, when you should not use this feature. It doesn’t always tell you the implementation details of this feature, and if you’re not aware of them, this can come back to haunt you (I’m not referring to bugs, but the way the feature is supposed to work and what it was really designed to do). In this book I strove to not only describe how things work, but also explain when and why you would consider using a particular feature or implementation. I feel it is important to understand not only the “how” behind things, but also the “when” and “why”—as well as the “when not” and “why not”! Who Should Read This Book The target audience for this book is anyone who develops applications with Oracle as the database back end. It is a book for professional Oracle developers who need to know how to get things done in the database. The practical nature of the book means that many sections should also be very interesting to the DBA. Most of the examples in the book use SQL*Plus to demonstrate the key features, so you won’t find out how to develop a really cool GUI—but you will find out how the Oracle database works, what its key features can do, and when they should (and should not) be used. This book is for anyone who wants to get more out of Oracle with less work. It is for anyone who wants to see new ways to use existing features. It is for anyone who wants to see how these features can be applied in the real world (not just examples of how to use the feature, but why the feature is relevant in the first place). Another category of people who would find this book of interest is technical managers in charge of the developers who work on Oracle projects. In some respects, it is just as important that they understand why knowing the database is crucial to success. This book can provide ammunition for managers who would like to get their personnel trained in the correct technologies or ensure that personnel already know what they need to know. To get the most out of this book, the reader should have • Knowledge of SQL. You don’t have to be the best SQL coder ever, but a good working knowledge will help. • An understanding of PL/SQL. This isn’t a prerequisite, but it will help you to “absorb” the examples. This book will not, for example, teach you how to program a FOR loop or declare a record type—the Oracle documentation and numerous books cover this well. However, that’s not to say that you won’t learn a lot about PL/SQL by reading this book. You will. You’ll become very intimate with many features of PL/SQL and you’ll see new ways to do things, and you’ll become aware of packages/features that perhaps you didn’t know existed.
Page 2 and 3: Expert Oracle Database Architecture
Page 4 and 5: Contents Foreword . . . . . . . . .
Page 6 and 7: ■CONTENTS v Block Buffer Cache .
Page 8 and 9: ■CONTENTS vii ■CHAPTER 9 Redo a
Page 10 and 11: ■CONTENTS ix ■CHAPTER 12 Dataty
Page 12 and 13: Foreword “THINK.” In 1914, Thom
Page 14 and 15: ■FOREWORD xiii Tom is an aficiona
Page 16 and 17: About the Technical Reviewers ■JO
Page 20 and 21: ■INTRODUCTION xix • Exposure to
Page 22 and 23: ■INTRODUCTION xxi Chapter 3: File
Page 24 and 25: ■INTRODUCTION xxiii Next up are t
Page 26 and 27: Setting Up Your Environment In this
Page 28 and 29: ■SETTING UP YOUR ENVIRONMENT xxvi
Page 30 and 31: ■SETTING UP YOUR ENVIRONMENT xxix
Page 32 and 33: ■SETTING UP YOUR ENVIRONMENT xxxi
Page 36 and 37: ■SETTING UP YOUR ENVIRONMENT xxxv
Page 38 and 39: ■SETTING UP YOUR ENVIRONMENT xxxv
Page 42 and 43: ■SETTING UP YOUR ENVIRONMENT xli
Page 44 and 45: ■SETTING UP YOUR ENVIRONMENT xlii
Page 46 and 47: CHAPTER 1 ■ ■ ■ Developing Su
Page 48 and 49: CHAPTER 1 ■ DEVELOPING SUCCESSFUL
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CHAPTER 1 ■ DEVELOPING SUCCESSFUL
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50 CHAPTER 2 ■ ARCHITECTURE OVERV
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CHAPTER 3 ■ ■ ■ Files In this
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CHAPTER 3 ■ FILES 67 Without a pa
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CHAPTER 3 ■ FILES 69 and even dat
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CHAPTER 3 ■ FILES 71 all operatio
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CHAPTER 3 ■ FILES 73 *.cluster_da
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CHAPTER 3 ■ FILES 75 ops$tkyte@OR
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CHAPTER 3 ■ FILES 77 • To maint
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CHAPTER 3 ■ FILES 79 • Resource
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CHAPTER 3 ■ FILES 81 3 l_dummy nu
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CHAPTER 3 ■ FILES 83 Trace Files
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CHAPTER 3 ■ FILES 85 _qerixAlloca
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CHAPTER 3 ■ FILES 87 6 ( 7 TYPE O
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CHAPTER 3 ■ FILES 89 A Brief Revi
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CHAPTER 3 ■ FILES 91 Redundant Ar
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CHAPTER 3 ■ FILES 93 (data from m
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CHAPTER 3 ■ FILES 95 dictionary t
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CHAPTER 3 ■ FILES 97 ■Note df i
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CHAPTER 3 ■ FILES 99 “accidenta
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CHAPTER 3 ■ FILES 101 So, at the
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CHAPTER 3 ■ FILES 103 Password Fi
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CHAPTER 3 ■ FILES 105 USER is "SY
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CHAPTER 3 ■ FILES 107 Flashback L
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CHAPTER 3 ■ FILES 109 of the requ
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CHAPTER 3 ■ FILES 111 IMPDP, howe
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CHAPTER 3 ■ FILES 113 tkyte@ORA10
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CHAPTER 4 ■ ■ ■ Memory Struct
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CHAPTER 4 ■ MEMORY STRUCTURES 117
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CHAPTER 5 ■ ■ ■ Oracle Proces
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CHAPTER 5 ■ ORACLE PROCESSES 157
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CHAPTER 6 ■ ■ ■ Locking and L
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CHAPTER 6 ■ LOCKING AND LATCHING
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CHAPTER 7 ■ ■ ■ Concurrency a
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CHAPTER 7 ■ CONCURRENCY AND MULTI
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CHAPTER 8 ■ ■ ■ Transactions
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CHAPTER 8 ■ TRANSACTIONS 257 •
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CHAPTER 8 ■ TRANSACTIONS 259 So,
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CHAPTER 8 ■ TRANSACTIONS 261 X --
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CHAPTER 8 ■ TRANSACTIONS 263 “s
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CHAPTER 8 ■ TRANSACTIONS 265 busi
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CHAPTER 8 ■ TRANSACTIONS 267 Many
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CHAPTER 8 ■ TRANSACTIONS 269 ops$
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CHAPTER 8 ■ TRANSACTIONS 271 last
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CHAPTER 8 ■ TRANSACTIONS 273 Dist
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CHAPTER 8 ■ TRANSACTIONS 275 Auto
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CHAPTER 8 ■ TRANSACTIONS 277 3 Au
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CHAPTER 8 ■ TRANSACTIONS 279 5 pr
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CHAPTER 8 ■ TRANSACTIONS 281 scot
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284 CHAPTER 9 ■ REDO AND UNDO cri
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286 CHAPTER 9 ■ REDO AND UNDO Fir
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288 CHAPTER 9 ■ REDO AND UNDO The
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290 CHAPTER 9 ■ REDO AND UNDO We
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292 CHAPTER 9 ■ REDO AND UNDO Wha
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294 CHAPTER 9 ■ REDO AND UNDO row
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296 CHAPTER 9 ■ REDO AND UNDO If
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298 CHAPTER 9 ■ REDO AND UNDO ops
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300 CHAPTER 9 ■ REDO AND UNDO Inv
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302 CHAPTER 9 ■ REDO AND UNDO The
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304 CHAPTER 9 ■ REDO AND UNDO 41
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306 CHAPTER 9 ■ REDO AND UNDO ins
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308 CHAPTER 9 ■ REDO AND UNDO So,
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314 CHAPTER 9 ■ REDO AND UNDO •
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316 CHAPTER 9 ■ REDO AND UNDO ...
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318 CHAPTER 9 ■ REDO AND UNDO •
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320 CHAPTER 9 ■ REDO AND UNDO bac
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322 CHAPTER 9 ■ REDO AND UNDO As
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326 CHAPTER 9 ■ REDO AND UNDO wil
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328 CHAPTER 9 ■ REDO AND UNDO Thi
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332 CHAPTER 9 ■ REDO AND UNDO Whe
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334 CHAPTER 9 ■ REDO AND UNDO Tha
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336 CHAPTER 9 ■ REDO AND UNDO tou
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338 CHAPTER 10 ■ DATABASE TABLES
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CHAPTER 11 ■ ■ ■ Indexes Inde
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CHAPTER 11 ■ INDEXES 423 value of
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CHAPTER 11 ■ INDEXES 425 One of t
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CHAPTER 11 ■ INDEXES 427 We then
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CHAPTER 11 ■ INDEXES 429 we ended
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CHAPTER 11 ■ INDEXES 431 The data
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CHAPTER 11 ■ INDEXES 433 if ( (++
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CHAPTER 11 ■ INDEXES 435 Table 11
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CHAPTER 11 ■ INDEXES 437 When Sho
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CHAPTER 11 ■ INDEXES 439 an 8KB b
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CHAPTER 11 ■ INDEXES 441 select *
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CHAPTER 11 ■ INDEXES 445 Indicate
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CHAPTER 11 ■ INDEXES 447 an index
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CHAPTER 11 ■ INDEXES 449 Table 11
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CHAPTER 11 ■ INDEXES 451 9 1, 'M'
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CHAPTER 11 ■ INDEXES 453 column w
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CHAPTER 11 ■ INDEXES 455 Bitmap j
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CHAPTER 11 ■ INDEXES 457 INSERT a
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CHAPTER 11 ■ INDEXES 459 7 l_last
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CHAPTER 11 ■ INDEXES 461 ops$tkyt
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CHAPTER 11 ■ INDEXES 463 If we co
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CHAPTER 11 ■ INDEXES 467 Caveat o
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CHAPTER 11 ■ INDEXES 471 Frequent
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CHAPTER 11 ■ INDEXES 475 If you s
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CHAPTER 11 ■ INDEXES 477 we’ll
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CHAPTER 11 ■ INDEXES 479 Predicat
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CHAPTER 11 ■ INDEXES 485 This dem
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CHAPTER 11 ■ INDEXES 487 SELECT /
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CHAPTER 12 ■ ■ ■ Datatypes Ch
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CHAPTER 12 ■ DATATYPES 491 • TI
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CHAPTER 12 ■ DATATYPES 493 (in th
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CHAPTER 12 ■ DATATYPES 495 That d
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CHAPTER 12 ■ DATATYPES 497 ops$tk
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CHAPTER 12 ■ DATATYPES 499 Table
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CHAPTER 12 ■ DATATYPES 501 The IN
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CHAPTER 12 ■ DATATYPES 505 • BI
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CHAPTER 12 ■ DATATYPES 507 NUMBER
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CHAPTER 12 ■ DATATYPES 509 MSG NU
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CHAPTER 12 ■ DATATYPES 511 They a
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CHAPTER 12 ■ DATATYPES 513 ■Not
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CHAPTER 12 ■ DATATYPES 515 Coping
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CHAPTER 12 ■ DATATYPES 517 Note t
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CHAPTER 12 ■ DATATYPES 519 We are
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CHAPTER 12 ■ DATATYPES 521 Format
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CHAPTER 12 ■ DATATYPES 525 You ca
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CHAPTER 12 ■ DATATYPES 527 month
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CHAPTER 12 ■ DATATYPES 529 DT2-DT
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CHAPTER 12 ■ DATATYPES 531 DT TS
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CHAPTER 12 ■ DATATYPES 535 Since
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CHAPTER 12 ■ DATATYPES 541 suppor
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CHAPTER 12 ■ DATATYPES 543 Concep
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CHAPTER 12 ■ DATATYPES 545 We can
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CHAPTER 12 ■ DATATYPES 547 buffer
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CHAPTER 12 ■ DATATYPES 549 Note t
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CHAPTER 12 ■ DATATYPES 551 13 dbm
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CHAPTER 12 ■ DATATYPES 553 equall
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CHAPTER 12 ■ DATATYPES 555 ROWID/
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CHAPTER 13 ■ ■ ■ Partitioning
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CHAPTER 13 ■ PARTITIONING 559 6 (
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CHAPTER 13 ■ PARTITIONING 561 els
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CHAPTER 13 ■ PARTITIONING 563 BIG
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CHAPTER 13 ■ PARTITIONING 565 Enh
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CHAPTER 13 ■ PARTITIONING 567 Tab
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CHAPTER 13 ■ PARTITIONING 569 tha
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CHAPTER 14 ■ ■ ■ Parallel Exe
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CHAPTER 14 ■ PARALLEL EXECUTION 6
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