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

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CHAPTER 15 ■ DATA LOADING AND UNLOADING 699 181 execute immediate 182 'alter session set nls_date_format=''' || l_datefmt || ''''; 183 return l_cnt; 184 exception 185 /* 186 In the event of ANY error, reset the data format and 187 re-raise the error. 188 */ 189 when others then 190 execute immediate 191 'alter session set nls_date_format=''' || l_datefmt || ''''; 192 RAISE; 193 end; 194 end run; 195 196 197 end unloader; 198 / Package body created. To run this, we can simply use the following (note that the following does, of course, require that you have SELECT on SCOTT.EMP granted to one of your roles or to yourself directly): ops$tkyte@ORA10G> set serveroutput on ops$tkyte@ORA10G> create or replace directory my_dir as '/tmp'; Directory created. ops$tkyte@ORA10G> declare 2 l_rows number; 3 begin 4 l_rows := unloader.run 5 ( p_query => 'select * from scott.emp order by empno', 6 p_tname => 'emp', 7 p_mode => 'replace', 8 p_dir => 'MY_DIR', 9 p_filename => 'emp', 10 p_separator => ',', 11 p_enclosure => '"', 12 p_terminator => '~' ); 13 14 dbms_output.put_line( to_char(l_rows) || 15 ' rows extracted to ascii file' ); 16 end; 17 / 14 rows extracted to ascii file PL/SQL procedure successfully completed.
700 CHAPTER 15 ■ DATA LOADING AND UNLOADING The control file that was generated by this shows the following (note that the numbers in parentheses in bold on the right are not actually in the file; they are solely for reference purposes): load data (1) infile 'emp.dat' "str x'7E0A'" (2) into table emp (3) replace (4) fields terminated by X'2c' enclosed by X'22' (5) ( (6) EMPNO char(44 ), (7) ENAME char(20 ), (8) JOB char(18 ), (9) MGR char(44 ), (10) HIREDATE date 'ddmmyyyyhh24miss' , (11) SAL char(44 ), (12) COMM char(44 ), (13) DEPTNO char(44 ), (14) ) (15) The things to note about this control file are as follows: • Line (2): We use the STR feature of SQLLDR. We can specify what character or string is used to terminate a record. This allows us to load data with embedded newlines easily. The string x'7E0A' is simply a tilde followed by a newline. • Line (5): We use our separator character and enclosure character. We do not use OPTIONALLY ENCLOSED BY, since we will be enclosing every single field after doubling any occurrence of the enclosure character in the raw data. • Line (11): We use a large “numeric” date format. This does two things: it avoids any NLS issues with regard to the data, and it preserves the time component of the date field. The raw data (.dat) file generated from the preceding code looks like this: "7369","SMITH","CLERK","7902","17121980000000","800","","20"~ "7499","ALLEN","SALESMAN","7698","20021981000000","1600","300","30"~ "7521","WARD","SALESMAN","7698","22021981000000","1250","500","30"~ "7566","JONES","MANAGER","7839","02041981000000","2975","","20"~ "7654","MARTIN","SALESMAN","7698","28091981000000","1250","1400","30"~ "7698","BLAKE","MANAGER","7839","01051981000000","2850","","30"~ "7782","CLARK","MANAGER","7839","09061981000000","2450","","10"~ "7788","SCOTT","ANALYST","7566","19041987000000","3000","","20"~ "7839","KING","PRESIDENT","","17111981000000","5000","","10"~ "7844","TURNER","SALESMAN","7698","08091981000000","1500","0","30"~ "7876","ADAMS","CLERK","7788","23051987000000","1100","","20"~ "7900","JAMES","CLERK","7698","03121981000000","950","","30"~ "7902","FORD","ANALYST","7566","03121981000000","3000","","20"~ "7934","MILLER","CLERK","7782","23011982000000","1300","","10"~
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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 xxix
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■SETTING UP YOUR ENVIRONMENT xxxi
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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 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 77 • To maint
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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 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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CHAPTER 8 ■ TRANSACTIONS 257 •
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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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284 CHAPTER 9 ■ REDO AND UNDO cri
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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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298 CHAPTER 9 ■ REDO AND UNDO ops
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300 CHAPTER 9 ■ REDO AND UNDO Inv
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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 431 The data
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CHAPTER 11 ■ INDEXES 435 Table 11
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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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Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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