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

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CHAPTER 15 ■ DATA LOADING AND UNLOADING 701 Things to note in the .dat file are as follows: • Each field is enclosed in our enclosure character. • The DATEs are unloaded as large numbers. • Each line of data in this file ends with a ~ as requested. We can now reload this data easily using SQLLDR. You may add options to the SQLLDR command line as you see fit. As stated previously, the logic of the unload package may be implemented in a variety of languages and tools. On the Ask Tom web site, you will find this example implemented not only in PL/SQL as here, but also in Pro*C and SQL*Plus scripts. Pro*C is the fastest implementation, and it always writes to the client workstation file system. PL/SQL is a good all-around implementation (there’s no need to compile and install on client workstations), but it always writes to the server file system. SQL*Plus is a good middle ground, offering fair performance and the ability to write to the client file system. Data Pump Unload Oracle9i introduced external tables as a method to read external data into the database. Oracle 10g introduced the ability to go the other direction and use a CREATE TABLE statement to create external data, to unload data from the database. As of Oracle 10g, this data is extracted in a proprietary binary format known as Data Pump format, which is the same format the EXPDB and IMPDP tools provided by Oracle use to move data from database to database. Using the external table unload is actually quite easy—as easy as a CREATE TABLE AS SELECT statement. To start, we need a DIRECTORY object: ops$tkyte@ORA10GR1> create or replace directory tmp as '/tmp' 2 / Directory created. Now we are ready to unload data to this directory using a simple SELECT statement, for example: ops$tkyte@ORA10GR1> create table all_objects_unload 2 organization external 3 ( type oracle_datapump 4 default directory TMP 5 location( 'allobjects.dat' ) 6 ) 7 as 8 select 9 * 10 from all_objects 11 / Table created.
702 CHAPTER 15 ■ DATA LOADING AND UNLOADING I purposely chose the ALL_OBJECTS view, because it is a quite complex view with lots of joins and predicates. This example shows we can use this Data Pump unload technique to extract arbitrary data from our database. We could add predicates, or whatever we wanted, to extract a slice of data. ■Note This example shows we can use this Data Pump unload technique to extract arbitrary data from our database. Yes, that is repeated text. From a security perspective, this does make it rather easy for someone with access to the information to “take” the information elsewhere. You need to control access to the set of people who have the ability to create DIRECTORY objects and write to them, and who have the necessary access to the physical server to get the unloaded data. The final step would be to copy allobjects.dat onto another server, perhaps a development machine for testing with, and extract the DDL to re-create this table over there: ops$tkyte@ORA10GR1> select dbms_metadata.get_ddl( 'TABLE', 'ALL_OBJECTS_UNLOAD' ) 2 from dual; DBMS_METADATA.GET_DDL('TABLE','ALL_OBJECTS_UNLOAD') -------------------------------------------------------------------------------- CREATE TABLE "OPS$TKYTE"."ALL_OBJECTS_UNLOAD" ( "OWNER" VARCHAR2(30), "OBJECT_NAME" VARCHAR2(30), "SUBOBJECT_NAME" VARCHAR2(30), "OBJECT_ID" NUMBER, "DATA_OBJECT_ID" NUMBER, "OBJECT_TYPE" VARCHAR2(19), "CREATED" DATE, "LAST_DDL_TIME" DATE, "TIMESTAMP" VARCHAR2(19), "STATUS" VARCHAR2(7), "TEMPORARY" VARCHAR2(1), "GENERATED" VARCHAR2(1), "SECONDARY" VARCHAR2(1) ) ORGANIZATION EXTERNAL ( TYPE ORACLE_DATAPUMP DEFAULT DIRECTORY "TMP" ) LOCATION ( 'allobjects.dat' )
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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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CHAPTER 1 ■ DEVELOPING SUCCESSFUL
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CHAPTER 4 ■ MEMORY STRUCTURES 117
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Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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