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

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CHAPTER 10 ■ DATABASE TABLES 411 ops$tkyte@ORA10G> create or replace type address_type 2 as object 3 ( city varchar2(30), 4 street varchar2(30), 5 state varchar2(2), 6 zip number 7 ) 8 / Type created. ops$tkyte@ORA10G> create or replace type person_type 2 as object 3 ( name varchar2(30), 4 dob date, 5 home_address address_type, 6 work_address address_type 7 ) 8 / Type created. ops$tkyte@ORA10G> create table people of person_type 2 / Table created. ops$tkyte@ORA10G> desc people Name Null? Type ---------------------------------------- -------- ---------------------------- NAME VARCHAR2(30) DOB DATE HOME_ADDRESS ADDRESS_TYPE WORK_ADDRESS ADDRESS_TYPE That’s all there is to it. We create some type definitions, and then we can create tables of that type. The table appears to have four columns representing the four attributes of the PERSON_TYPE we created. We are at the point where we can now perform DML on the object table to create and query data: ops$tkyte@ORA10G> insert into people values ( 'Tom', '15-mar-1965', 2 address_type( 'Reston', '123 Main Street', 'Va', '45678' ), 3 address_type( 'Redwood', '1 Oracle Way', 'Ca', '23456' ) ); 1 row created. ops$tkyte@ORA10G> select * from people; NAME DOB HOME_ADDRESS(CITY, S WORK_ADDRESS(CITY, S ----- --------- -------------------- -------------------- Tom 15-MAR-65 ADDRESS_TYPE('Reston ADDRESS_TYPE('Redwoo
412 CHAPTER 10 ■ DATABASE TABLES ', '123 Main Street' d', '1 Oracle Way', , 'Va', 45678) 'Ca', 23456) ops$tkyte@ORA10G> select name, p.home_address.city from people p; NAME HOME_ADDRESS.CITY ----- ------------------------------ Tom Reston We’re starting to see some of the object syntax necessary to deal with object types. For example, in the INSERT statement we had to wrap the HOME_ADDRESS and WORK_ADDRESS with a CAST. We cast the scalar values to be of an ADDRESS_TYPE. Another way of saying this is that we create an ADDRESS_TYPE instance for that row by using the default constructor for the ADDRESS_TYPE object. Now, as far as the external face of the table is concerned, there are four columns in our table. By now, after seeing the hidden magic that took place for the nested tables, we can probably guess that there is something else going on. Oracle stores all object-relational data in plain old relational tables—at the end of the day it is all in rows and columns. If we dig into the “real” data dictionary, we can see what this table really looks like: ops$tkyte@ORA10G> select name, segcollength 2 from sys.col$ 3 where obj# = ( select object_id 4 from user_objects 5 where object_name = 'PEOPLE' ) 6 / NAME SEGCOLLENGTH ------------------------- ------------ SYS_NC_OID$ 16 SYS_NC_ROWINFO$ 1 NAME 30 DOB 7 HOME_ADDRESS 1 SYS_NC00006$ 30 SYS_NC00007$ 30 SYS_NC00008$ 2 SYS_NC00009$ 22 WORK_ADDRESS 1 SYS_NC00011$ 30 SYS_NC00012$ 30 SYS_NC00013$ 2 SYS_NC00014$ 22 14 rows selected. This looks quite different from what DESCRIBE tells us. Apparently, there are 14 columns in this table, not 4. In this case, they are
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Expert Oracle Database Architecture
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Contents Foreword . . . . . . . . .
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■CONTENTS v Block Buffer Cache .
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■CONTENTS vii ■CHAPTER 9 Redo a
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■CONTENTS ix ■CHAPTER 12 Dataty
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Foreword “THINK.” In 1914, Thom
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■FOREWORD xiii Tom is an aficiona
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About the Technical Reviewers ■JO
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Introduction The inspiration for th
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■INTRODUCTION xix • Exposure to
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■INTRODUCTION xxi Chapter 3: File
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■INTRODUCTION xxiii Next up are t
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Setting Up Your Environment In this
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■SETTING UP YOUR ENVIRONMENT xxvi
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■SETTING UP YOUR ENVIRONMENT xxxv
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■SETTING UP YOUR ENVIRONMENT xlii
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CHAPTER 1 ■ ■ ■ Developing Su
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CHAPTER 1 ■ DEVELOPING SUCCESSFUL
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CHAPTER 3 ■ ■ ■ Files In this
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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 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 99 “accidenta
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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 LATCHING
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CHAPTER 8 ■ ■ ■ Transactions
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284 CHAPTER 9 ■ REDO AND UNDO cri
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288 CHAPTER 9 ■ REDO AND UNDO The
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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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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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318 CHAPTER 9 ■ REDO AND UNDO •
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320 CHAPTER 9 ■ REDO AND UNDO bac
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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 13 ■ ■ ■ Partitioning
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CHAPTER 13 ■ PARTITIONING 565 Enh
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