Essbase Cube开发实战与优化指南

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"Essbase Cube 开发指导手册，涵盖了Essbase立方体设计、性能与负载测试以及如何通过SQL增强 Essbase 最佳实践。本书由多位专家合著，旨在提供混合技术与实践的详细开发指南。" 《Essbase Cube 开发指导手册》是针对Essbase应用开发的一本综合指南，由Cameron Lackpour主编，并由John Booth、Tim German、William Hodges、Mike Nader、Martin Neuliep和Glenn Schwartzberg等业界专家共同撰写。这本书由CRC Press（Taylor & Francis Group的一个印记）出版，提供了从可靠来源获取的权威信息。该书主要围绕以下几个核心知识点展开： 1. **Essbase Cube设计**：Essbase是一款强大的多维数据库系统，常用于企业级的数据分析和决策支持。在立方体设计部分，作者们可能详细讲解了如何构建有效的数据模型，包括维度设计、事实表结构、层次结构的创建以及数据加载策略。此外，还可能涉及了最佳实践，如优化数据存储、处理和查询性能的方法。 2. **性能与负载测试**：这部分内容可能包含了如何评估和提升Essbase系统的性能，包括性能监控、基准测试、负载测试和压力测试。读者可以学习如何识别性能瓶颈，并掌握调整参数和配置以提高系统响应速度和处理能力的方法。 3. **利用SQL增强Essbase**：虽然Essbase主要用于多维分析，但与SQL的集成使得用户能够利用更熟悉的SQL语法进行查询和数据分析。书中可能详细介绍了如何将Essbase与SQL结合，包括使用嵌入式SQL、ODBC/JDBC连接，以及如何通过SQL进行复杂的数据提取和报表生成。 4. **混合技术和实践**：这一部分可能讨论了Essbase与其他技术（如BI工具、ETL流程、大数据平台等）的集成，以实现混合分析解决方案。这可能涉及到数据整合、实时分析和智能报告等方面的技术和策略。 5. **版权信息和使用声明**：书中的版权信息强调了对原始资料的尊重和对使用内容的准确性负责，同时指出已尽力确认所有材料的合法性，但不承担因使用而产生的任何后果。若发现有未授权复制的内容，出版社会采取措施进行修正。《Essbase Cube 开发指导手册》是一本全面的参考书籍，对于想要深入理解和开发Essbase应用的专业人士来说，具有很高的价值。它不仅涵盖了理论知识，也提供了丰富的实践经验，有助于读者提升在多维数据管理和分析领域的专业技能。

76 MARTIN NEULIEP

Perhaps you are a technology-savvy nancial analyst, have just nished taking Essbase

training, and are now facing building your rst real Essbase application. You know

how to build all the major components that make up an Essbase application, but how

do you translate what your division controller is asking for into an actual Essbase

design? How do you know you are headed in the right direction? Or perhaps you have

one or two Essbase systems under your belt, but the experience of building them was

not as straightforward as you thought it would be when you started, or the perfor-

mance of the systems was disappointing when they were nished. Or perhaps you are

an information technology (IT) professional who has worked with Essbase applica-

tions in your organization for some time, managing, administering, and maintaining

them successfully, but now you are being asked to develop a new application based

on relational databases that you know well. Where do you start? Will you be able to

distinguish a good Essbase design from a bad one?

If any of these descriptions or questions resonates with you, you are the person

this chapter is written for. It is assumed that you know what buttons to click and

syntax to type to create Essbase application components such as outlines, rules les,

calculation scripts, and so on. But just like Excel, Essbase is a blank slate. Sure,

sample applications come with the product, but when you click OK in that Create

Application dialog box for the rst (or second, or third) time, nothing but an empty

shell is staring you in the face, and it is totally up to you to create a useful design that

will make implementation easy and performance good. You can learn the mechan-

ics of how to build Essbase systems in lots of ways, but comparatively little has been

written about what you should build. is chapter aims to provide you with the next

level of information you need to succeed with Essbase after you’ve learned the basics

of how it works.

With a good cube design in place, any diculties you may encounter during imple-

mentation can usually be solved without too much pain. With bad cube design, solv-

ing problems after the fact is sometimes so dicult that it is easier to throw most of

the system away and start over. Every one of the case studies in this chapter is based

on actual Essbase cubes encountered in production at organizations whose names you

would recognize. I hope they help you as you develop your Essbase design chops.

3.1 Is Essbase the Right Tool?

e rst key to success with Essbase is to recognize whether it is the right tool to solve

your problem. Essbase’s multidimensional data model is not as general purpose as the

relational model. It was designed to eciently address a class of business problems,

and it does that job very well indeed. Sometimes, with a little creativity, other prob-

lems can be cast in terms of a multidimensional model, and Essbase can be of value

in unexpected places. Essbase Studio also provides a drill-through feature that lets

you combine multidimensional analysis with relational queries, and this surprisingly

infrequently used feature can be of enormous value. But you can denitely go too far

77THE YOUNG PERSON’S GUIDE TO ESSBASE CUBE DESIGN

and ask Essbase to do a job for which it simply is not suited. Here are some character-

istics of Essbase that will help you decide on which technology to use.

3.1.1 Simple Size Limitations

Essbase was designed to allow fast access to summary information; it was never

intended to be a transactional system. Because of this, it was not designed to handle

the number of unique items you would see at a transactional level. So if you are the US

Internal Revenue Service, you could not build an Essbase cube containing a Taxpayer

dimension at the individual taxpayer level because Essbase (even using the Aggregate

Storage Option [ASO]) has a limit on the total number of members in an outline in

the tens of millions.

is is an area where the Essbase Studio drill-through capability can be very use-

ful. Instead of building a Taxpayer dimension down to the individual level, you would

stop at some higher summary level, say ZIP code. Since fewer than 50,000 ZIP codes

are in use in the United States, you have no problem with Essbase limits. e drill-

through feature lets users retrieve detail-level data that correspond to a particular cube

cell. Drill-through is not a cure-all solution, however. For example, retrieving data

for all the taxpayers in a ZIP code might return too much data, so you would need

to congure drill-through to require additional dimensions to be part of the detail

data query. But adding many dimensions to the drill-through query makes using the

feature more dicult for users because they have to select lower-level members from

more dimensions before drill-through is enabled. Drill-through also is not a workable

solution if the lowest level of detail is needed within the cube itself, perhaps because

you need to express calculations at that level. If this is the case, Essbase ceases to be a

usable tool for your application.

Essbase does include an older feature called Hybrid Analysis that was intended to

address dimension size limitations. (Do not confuse this older feature with the new

Hybrid Essbase engine.) However, Hybrid Analysis imposes numerous restrictions on

Essbase functionality and has never been a very popular solution.

3.1.2 Numeric Measures

Every cell in Essbase stores a number, even when you are using typed measures that

look like they store text but do not—the predened text values are simply mapped to

numbers. If your application requires storing and manipulating large amounts of text,

Essbase is not the tool to use.

3.1.3 Hierarchies

Essbase contains a multitude of features that assume your dimensions will be hierar-

chies and not just at lists of values. Of course, a big at list of members with a single

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