DataStage官方培训教程7.pptx

DataStage Essentials; ? This document and the software described herein are the property of Ascential Software Corporation and its licensors and contain confidential trade secrets. All rights to this publication are reserved. No part of this document may be reproduced, transmitted, transcribed, stored in a retrieval system or translated into any language, in any form or by any means, without prior permission from Ascential Software Corporation. ? Copyright ? 2003 Ascential Software Corporation. All rights Reserved ? Ascential Software Corporation reserves the right to make changes to this document and the software described herein at any time and without notice. No warranty is expressed or implied other than any contained in the terms and conditions of sale. ? Ascential Software Corporation 50 Washington Street Westboro, MA 01581-1021 USA Phone: (508) 366-3888 Fax: (508) 366-3669 ? Ascential, DataStage, INTEGRITY, MetaRecon, MetaStage and MetaBroker are trademarks of Ascential Software Corporation. Pick is a registered trademark of Pick Systems. Ascential Software is not a licensee of Pick Systems. Other trademarks and registered trademarks are the property of the respective trademark holder. ? 2/2/2020;Upon module completion, students will be able to: Define what a hashed file is List different types of hashed files List various uses for hashed files Create hashed files Source hashed files Use caching attributes to accelerate reads and writes Import metadata from hashed files Delete hashed files;What is a Hashed File?;Types of Hashed Files;Uses of Hashed Files;Hashing Algorithms (Static File Types);;Overflow Groups;Creating Hashed Files;How many groups to create initially;Hashed File Locations;Write Caching;Importing Metadata from a Hashed File;Sourcing a Hashed File;Read Caching;Deleting Hashed Files