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

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CHAPTER 14 ■ PARALLEL EXECUTION 633 TERMINATED BY "|" ) ) location ( 'big_table.dat' ) )REJECT LIMIT UNLIMITED All we need to do is edit that a bit to name the external table the way we want; change the directories, perhaps; <strong>and</strong> so on: ops$tkyte@ORA10GR1> create or replace directory my_dir as '/tmp/' 2 / Directory created. And after that, all we need to do is actually create the table: ops$tkyte@ORA10GR1> CREATE TABLE "BIG_TABLE_ET" 2 ( 3 "ID" NUMBER, ... 16 "SECONDARY" VARCHAR2(1) 17 ) 18 ORGANIZATION external 19 ( 20 TYPE oracle_loader 21 DEFAULT DIRECTORY MY_DIR 22 ACCESS PARAMETERS 23 ( 24 RECORDS DELIMITED BY NEWLINE CHARACTERSET WE8ISO8859P1 25 READSIZE 1048576 26 FIELDS TERMINATED BY "|" LDRTRIM 27 REJECT ROWS WITH ALL NULL FIELDS 28 ) 29 location 30 ( 31 'big_table.dat' 32 ) 33 )REJECT LIMIT UNLIMITED 34 / Table created. Then we make this table parallel enabled. This is the magic step—this is what will facilitate an easy parallel direct path load: ops$tkyte@ORA10GR1> alter table big_table_et PARALLEL; Table altered.
634 CHAPTER 14 ■ PARALLEL EXECUTION ■Note The PARALLEL clause may also be used on the CREATE TABLE statement itself. Right after the REJECT LIMIT UNLIMITED, the keyword PARALLEL could have been added. I used the ALTER statement just to draw attention to the fact that the external table is, in fact, parallel enabled. Extent Trimming with UNIFORM vs. AUTOALLOCATE Locally-Managed Tablespaces That’s all we need to do to set up the load component. Now, we would like to investigate how space is managed in a locally-managed tablespace (LMT) that uses UNIFORM extent sizes, compared to how space is managed in an LMT that AUTOALLOCATEs extents. In this case, we’ll use 100MB extents. First we create LMT_UNIFORM, which uses uniform extent sizes: ops$tkyte@ORA10GR1> create tablespace lmt_uniform 2 datafile '/u03/ora10gr1/lmt_uniform.dbf' size 1048640K reuse 3 autoextend on next 100m 4 extent management local 5 uniform size 100m; Tablespace created. Next, we create LMT_AUTO, which uses AUTOALLOCATE to determine extent sizes: ops$tkyte@ORA10GR1> create tablespace lmt_auto 2 datafile '/u03/ora10gr1/lmt_auto.dbf' size 1048640K reuse 3 autoextend on next 100m 4 extent management local 5 autoallocate; Tablespace created. Each tablespace started with a 1GB data file (plus 64KB used by LMTs to manage the storage; it would be 128KB extra instead of 64KB if we were to use a 32KB blocksize). We permit these data files to autoextend 100MB at a time. We are going to load this file: $ ls -lag big_table.dat -rw-rw-r-- 1 tkyte 1067107251 Jul 11 13:46 big_table.dat which is a 10,000,000-record file. It was created using the big_table.sql script found in the “Setting Up” section at the beginning of this book <strong>and</strong> then unloaded using the flat.sql script available at http://asktom.oracle.com/~tkyte/flat/index.html. Next, we do a parallel direct path load of this file into each tablespace: ops$tkyte@ORA10GR1> create table uniform_test 2 parallel 3 tablespace lmt_uniform 4 as 5 select * from big_table_et; Table created. ops$tkyte@ORA10GR1> create table autoallocate_test 2 parallel
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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 xlii
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CHAPTER 1 ■ ■ ■ Developing Su
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CHAPTER 1 ■ DEVELOPING SUCCESSFUL
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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 79 • Resource
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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 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 8 ■ ■ ■ Transactions
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284 CHAPTER 9 ■ REDO AND UNDO cri
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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 445 Indicate
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CHAPTER 11 ■ INDEXES 447 an index
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CHAPTER 13 ■ ■ ■ Partitioning
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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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706 ■INDEX autonomous transaction
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