By Jonathan Gennick, Sanjay Mishra
SQL*Loader is a ubiquitous instrument within the Oracle international. it's been shipped with Oracle considering that not less than model 6 and remains to be supported and more suitable with each one new edition of Oracle, together with Oracle8 and Oracle8i. The task of SQL*Loader is to load information from flat documents into an Oracle database. it is optimized for loading huge volumes of knowledge, and is versatile adequate to address almost any enter layout. nearly each Oracle person has to take advantage of SQL*Loader at one time or one other, and DBAs are often known as upon to load facts for the clients of their association. regardless of SQL*Loader's huge availability and utilization, few DBAs and builders know the way to get the main out of it. Oracle SQL*Loader: The Definitive consultant has every thing you want to recognize to place SQL*Loader to its top use: an creation to SQL*Loader, a connection with all of its syntax strategies, and most significantly, step by step directions for all of the SQL*Loader initiatives you'll are looking to practice - and perhaps a few you did not notice you'll practice. you will the right way to build the required regulate documents and cargo from sorts of documents containing kinds of info (e.g., fixed-width info, delimited facts, and knowledge of varied datatypes). you are going to additionally the right way to validate facts, load it selectively, remodel it because it is loaded, and get better after failure. This publication explains the right way to optimize SQL*Loader functionality through adjusting the transaction dimension and utilizing the recent direct course choice. It additionally covers the most recent SQL*Loader positive factors - the loading of enormous item (LOB) columns and the recent item varieties (nested tables, various arrays, and item tables). Oracle SQL*Loader: The Definitive consultant is an imperative source for somebody who's new to SQL*Loader; a task-oriented studying software in case you are already utilizing it; and a short reference for each person. on the way to take top benefit of a necessary Oracle device, you would like this e-book.
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Extra info for Oracle SQL*Loader: the definitive guide
Example text
You may include a path as part of the name. bad extension, and is written to the same directory as the control file. bad. However, if you use the BAD parameter to specify a bad file name, the default directory becomes your current working directory. If you are loading data from multiple files, then this bad file name only gets associated with the first file being loaded. This is the Title of the Book, eMatter Edition Copyright © 2001 O’Reilly & Associates, Inc. All rights reserved. 23781 Page 16 Wednesday, April 11, 2001 1:42 PM 16 Chapter 1: Introduction to SQL*Loader DATA = path_file_name Specifies the name of the file containing the data to load.
In this example, the INFILE and INTO TABLE clauses are both subordinate to LOAD DATA, and they appear flush-left underneath those keywords. The BADFILE and DISCARDFILE clauses are related to the input file, and thus have been indented underneath INFILE. Similarly, the WHEN clause is part of the INTO TABLE clause, and has been indented accordingly. In general, when we are writing control files, we try to use the following formatting conventions: • Place the LOAD keyword, or the CONTINUE_LOAD keyword, on a line by itself.
Whenever SQL*Loader encounters a database error while trying to load a record, it writes that record to a file known as the bad file. Discard files, on the other hand, are used to hold records that do not meet selection criteria specified in the SQL*Loader control file. By default, SQL*Loader will attempt to load all the records contained in the input file. You have the option, though, in your control file, of specifying selection criteria that a record must meet before it is loaded. Records that do not meet the specified criteria are not loaded, and are instead written to a file known as the discard file.