Oracle SQL*Loader: the definitive guide by Jonathan Gennick, Sanjay Mishra

By Jonathan Gennick, Sanjay Mishra

SQL*Loader is a ubiquitous instrument within the Oracle international. it's been shipped with Oracle seeing that a minimum of model 6 and remains to be supported and stronger with every one new edition of Oracle, together with Oracle8 and Oracle8i. The activity of SQL*Loader is to load information from flat records into an Oracle database. it really is optimized for loading huge volumes of knowledge, and is versatile sufficient to address almost any enter layout. virtually each Oracle consumer has to exploit SQL*Loader at one time or one other, and DBAs are usually referred to as upon to load info for the clients of their association. regardless of SQL*Loader's vast availability and utilization, few DBAs and builders understand how to get the main out of it. Oracle SQL*Loader: The Definitive advisor has every little thing you must be aware of to place SQL*Loader to its most sensible use: an advent to SQL*Loader, a connection with all of its syntax recommendations, 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 discover you may practice. you are going to the way to build the required regulate documents and cargo from sorts of documents containing forms of facts (e.g., fixed-width facts, delimited facts, and information of assorted datatypes). you will additionally easy methods to validate facts, load it selectively, rework it because it is loaded, and get better after failure. This publication explains the right way to optimize SQL*Loader functionality via adjusting the transaction dimension and utilizing the recent direct direction alternative. It additionally covers the latest SQL*Loader gains - the loading of enormous item (LOB) columns and the recent item forms (nested tables, various arrays, and item tables). Oracle SQL*Loader: The Definitive advisor is an integral source for a person who's new to SQL*Loader; a task-oriented studying device should you are already utilizing it; and a brief reference for each person. for you to take most sensible good thing about an important Oracle software, you wish this booklet.

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The summary tells you how many rows were loaded, how many had errors, how many were discarded, and so forth. It looks like this: Table GFN_GNIS_FEATURE_NAMES: 32056 Rows successfully loaded. 0 Rows not loaded due to data errors. 0 Rows not loaded because all WHEN clauses were failed. 0 Rows not loaded because all fields were null. 81 You can see from this summary that 32,056 feature names were loaded into the gfn_gnis_feature_names table for the state of Michigan. There were no errors, and no records were discarded.

24007 Page 31 Wednesday, April 11, 2001 1:43 PM The LOAD Statement 31 PRESERVE BLANKS Tells SQL*Loader to preserve leading and trailing blanks in the input record fields. The manner in which SQL*Loader handles whitespace depends on whether you are loading fixed-width or delimited data. Chapters 4 and 5, respectively, cover this topic. INTO TABLE clause Identifies a table that you are loading. You may specify multiple occurrences of the INTO TABLE clause if you need to distribute the data that you are loading over multiple tables.

Use the len_bytes value to specify a different prefix length. badfile_name The name of the file into which you want SQL*Loader to write records that could not be loaded because of database errors or problems with the data. bad.

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