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Listing 13-7 shows the log file generated using the EXTERNAL_TABLE=GENERATE_ONLY parameter Listing 13-7 Using SQL*Loader to Generate the External Table Creation Statements SQL*Loader: Release 102000 - Beta on Sun Mar 6 13:49:39 2005 Copyright (c) 1982, 2004, Oracle All rights reserved Control File: testctl Data File: testctl Bad File: testbad Discard File: none specified (Allow all discards) Number to load: ALL Number to skip: 0 Errors allowed: 50 Continuation: none specified Path used: External Table Table TEST_EMP, loaded from every logical record.

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Insert option in effect for this table: INSERT Column Name Position Len Term Encl Datatype ------------------------------ ---------- ----- ---- ---- --------EMPLOYEE_ID FIRST * , O(") CHARACTER FIRST_NAME NEXT * , O(") CHARACTER LAST_NAME NEXT * , O(") CHARACTER HIRE_DATE NEXT * , O(") CHARACTER SALARY NEXT * , O(") CHARACTER MANAGER_ID NEXT * , O(") CHARACTER CREATE DIRECTORY statements needed for files -----------------------------------------------------------------------CREATE DIRECTORY SYS_SQLLDR_XT_TMPDIR_00000 AS '/u01/app/oracle/dba' CREATE TABLE statement for external table: -----------------------------------------------------------------------CREATE TABLE "SYS_SQLLDR_X_EXT_TEST_EMP" ( "EMPLOYEE_ID" NUMBER, "FIRST_NAME" VARCHAR2(20), "LAST_NAME" VARCHAR2(20), "HIRE_DATE" DATE, "SALARY" NUMBER, "MANAGER_ID" NUMBER ) ORGANIZATION external.

TYPE oracle_loader DEFAULT DIRECTORY SYS_SQLLDR_XT_TMPDIR_00000 ACCESS PARAMETERS ( RECORDS DELIMITED BY NEWLINE CHARACTERSET US7ASCII BADFILE 'SYS_SQLLDR_XT_TMPDIR_00000':'test.bad' LOGFILE 'test.log_xt' READSIZE 1048576 SKIP 6 FIELDS TERMINATED BY "," OPTIONALLY ENCLOSED BY '"' LDRTRIM REJECT ROWS WITH ALL NULL FIELDS ( "EMPLOYEE_ID" CHAR(255) TERMINATED BY "," OPTIONALLY ENCLOSED BY '"', "FIRST_NAME" CHAR(255) TERMINATED BY "," OPTIONALLY ENCLOSED BY '"', "LAST_NAME" CHAR(255) TERMINATED BY "," OPTIONALLY ENCLOSED BY '"', "HIRE_DATE" CHAR(255) TERMINATED BY "," OPTIONALLY ENCLOSED BY '"', "SALARY" CHAR(255) TERMINATED BY "," OPTIONALLY ENCLOSED BY '"', "MANAGER_ID" CHAR(255) TERMINATED BY "," OPTIONALLY ENCLOSED BY '"' ) ) location ( 'test.ctl' ) )REJECT LIMIT UNLIMITED INSERT statements used to load internal tables: -------------------------------------------------------------INSERT /*+ append */ INTO TEST_EMP ( EMPLOYEE_ID, FIRST_NAME, LAST_NAME, HIRE_DATE, SALARY, MANAGER_ID ) SELECT "EMPLOYEE_ID", "FIRST_NAME", "LAST_NAME", "HIRE_DATE", "SALARY", "MANAGER_ID" FROM "SYS_SQLLDR_X_EXT_TEST_EMP" Run began on Sun Mar 06 13:49:39 2005 Run ended on Sun Mar 06 13:49:40 2005 Elapsed time was: 00:00:01.22 CPU time was: 00:00:00.27 You can see that it s a lot easier to generate the CREATE TABLE statements for the external tables this way, rather than creating them from scratch.

#!/bin/sh HOWOLD=30 FSLIST="/ /boot" UNAME=`uname -n` DATE=`date +%m%d%I%M` DATADIR="/usr/local/data/cores" LOGFILE="$DATADIR/cor_report"

In most cases, especially in data warehouse environments, the data you re loading needs to be transformed to make it more meaningful for analysis. Oracle Database 10g can help you perform sophisticated and efficient data transformation within the database itself, so you don t need to rely on external processes or tools. You have several ways of performing data transformations in Oracle Database 10g. The following are the most commonly used techniques: Derive the data from existing tables. You can use joins or aggregations of data from tables in the same database, or you can gather the data from tables located in external Oracle or nonOracle databases. Use SQL to transform data. SQL techniques including the MERGE statement, multiple-table inserts, and table functions to transform data during the loading process. Use Oracle Database 10g s MODEL statement, which helps you perform highly expressive computations using sets of interrelated formulas. Using the MODEL clause, you can now treat an Oracle table as an n-dimensional array and specify interrow references without SQL joins and unions.

For many use cases, the cleanup logic discussed so far is sufficient As I will explain in the next sections, there is still a small potential for resource leaks, but unless your application has really high reliability and availability requirements, these cases can be ignored Especially if you can afford to shut down and restart your application in the case of a resource leak and the resource you wrap is automatically cleaned up at process shutdown, you can ignore the following discussion However, if the wrapper library you implement is used in a server application with high availability and reliability requirements, shutting down a process and restarting the application is not an option There are some scenarios in which the wrapper class and the handle class implemented so far are not able to perform last-chance cleanup for native resources These cleanup issues are caused by asynchronous exceptions.

You can also use PL/SQL procedural techniques to perform complex data transformations. The real issue here is whether you have the time and expertise at your disposal to code the transformation. In addition, when you re dealing with very large data sets, the use of PL/SQL is not very efficient when you compare it to some of the alternatives.

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