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TechTip: Creating Local OLAP Cube Data Files with DB2 Data

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Give users offline access to DB2 data in a versatile pivot table format.

 

In "Crunching AS/400 Data with OLAP Cubes and Excel 2000," I outlined how to use the Pivot Table wizard with Excel 2000 (and higher) to create pivot tables from DB2 data using an ODBC data source. This TechTip will go a step further.

 

Pivot tables are extremely useful because they allow a user to aggregate data in innumerable ways. For instance, sales dollars and quantity can be summarized by calendar quarter, by customer, by item classification, etc. Pivot tables, therefore, relieve IT from writing the same basic report over and over. (How many times have developers written the same basic report, just summarized a little differently?) Instead, pivot tables allow IT to collect the basic data and leave it to the user to summarize and format it as desired.

 

In this TechTip, I'll demonstrate how a script process can create a local OLAP cube file from DB2 data without using the Excel interface. (An OLAP cube file is a specialized file that stores aggregations in an optimized format.) Once a cube file is created, it can be distributed via a network share, emailed, or posted on a Web site for users to access and review using pivot tables within Excel. Since this is a script process, the cube data build can be scheduled to refresh at regular intervals. Furthermore, creating a local cube file alleviates the need for the user to have DB2 connectivity software and to go through the complicated Create Cube wizard.

Requirements

I'll demonstrate the technique to build a cube file using VBScript, although you could use VBA, .NET, or any other development environment that can take advantage of the ActiveX Data Objects library. The ODBC component from the System i Access CD (formerly iSeries Access) is required to be installed on the computer that will create the cube file. Alternatively, a third-party ODBC driver can be substituted. Keep in mind that almost any database server in your organization can be used as a data source for an offline cube.

 

You computer should also have the latest Microsoft Data Access Components (MDAC) library installed, along with a version of Excel (2000 or higher.) Most computers already have a recent MDAC version installed.

The Data

Since IBM hasn't given DB2 for i users a large test data set to tinker with (hint to IBM: the CORPDATA sample data is good, but we need more data!), I decided to re-use the data from the original article, an export of Microsoft's Northwind Traders Access database to DB2. The Northwind database stores customer order data. Figure 1 below shows the tables and relationships in the Northwind schema.

 

102408SansoterraFigure1.JPG

Figure 1: These are the tables and relationships in the Northwind schema example. (Click images to enlarge.)

 

A Quick Review

How can we make this relational data useful to management? One way is to create a cube file that will "pre-aggregate" the sales data, such as quantity and extended price (aka measures) by a variety of summarization columns (aka dimensions) such as item number, item description, item category, and customer name. Once the data is pre-aggregated in a local cube file, we can allow users to quickly review the aggregations in Excel using pivot tables (more about that in a minute).

 

But first, remember that when defining a cube we need to define what is being aggregated (sometimes called measures, facts, or values) and how to summarize these aggregates (called dimensions or labels). The table below shows a list of measures and dimensions for the sample cube.

 

Sample Cube Definition

Dimensions

Measures / Aggregate

Product Category

Quantity

Sum

Country

Extended Price

Sum

Customer

Highest Price

Max

Order Date

 

Product

 

Supplier

 

 

When this cube is built, it will contain summarizations of the aggregates by all combinations of dimensions. For example, a user could ask for total quantity and sales by supplier, by country within product, etc., and the cube will give an answer. This example is simple, but other meaningful measures, such as gross profit (extended price minus cost), could be added to the cube as a measure.

 

If you find yourself lost at this point, it is probably a good idea to review the prior article. Here is a warning from the previous article when designing a cube: local cube files are limited in scalability, so choose your dimension combinations wisely. Each additional dimension exponentially bumps up the number of aggregations done and increases the cube file size, processing time, and wait time accordingly.

A Brief Review of Pivot Tables

What is a pivot table? A pivot table is a tool in Excel that allows summarization, sorting, and analysis of data from a data source. Possible data sources to feed a pivot table are a range of cells in a spreadsheet or, you guessed it, an OLAP cube file.

 

The best way to talk about pivot table is to show one. Figure 2 shows an Excel 2007 spreadsheet containing a pivot table based on our sample cube.

 

102408SansoterraFigure2.JPG

Figure 2: This Excel spreadsheet contains a pivot table based on our sample cube.

 

As you can see, the Extended Price column (i.e., sales data) is summarized by date (columns) and product category (rows). The Country box at the top left is called a report filter. In this case, the report filter can be used to drill down to one or more countries.

 

The beauty is that, by a simple drag-and-drop operation, the data can be summarized in another way. Instead of summarizing rows by product category, we can summarize by supplier or customer or customer within product. If we wanted, we could put the order date (year, quarter, etc.) as a report filter in place of country. The possibilities are endless, and users can do this themselves so that IT doesn't have to write yet another variation on an existing report.

 

For those who need pivot table help, there are plenty of tutorials in the Microsoft help and on the Web.

Building a Local Cube Offline

In the prior article, we used the "Microsoft Query add-in for Excel" to build the cube data within Excel. Now however, we want to write a program to build a cube. In order to do this, we'll need the following:

•·        A connection to the cube's data source (in this case, ODBC will get data from DB2)

•·        A cube definition that defines the cube's measures and dimensions

•·        A DB2 SQL statement that can gather all of the required cube information into a single result set

 

With these things in mind, look at the end of this TechTip for the sample VBScript code (CreateSalesCube.vbs) required to build a cube file.

 

A local cube file is created using a specialized OLE DB provider from Microsoft called MSOLAP. As with any OLE DB provider, to use MSOLAP, you need to do the following:

•·        Instantiate an ActiveX Data Objects (ADO) connection object. (ADO is a standard Microsoft technology that allows a data connection to be made to a variety of data sources, usually database servers but also Exchange, Active Directory, and spreadsheets. An OLE DB provider is a vendor-specific plug-in to the ADO library.)

•·        Set a connection string to a data source.

•·        Open the connection.

 

Once the connection is opened, a program performs operations against a data source and then closes the connection.

 

The great thing about using MSOLAP is that it will build a local cube file from a remote data source using instructions specified all within the connection string. Once the connection is opened, the local cube will be built with no subsequent instructions. Therefore, the VBScript program does the following four steps:

•·        Create a connection object.

•·        Set the connection string to create a cube from a remote data source.

•·        Open the connection (which executes the connection string instructions).

•·        Close the connection.

 

Now that's easy enough to understand, but the connection string itself needs explanation. Not your typical connection string, the connection string for MSOLAP is divided into the following sections:

•·        LOCATION identifies where the local cube file will be created. It can be a drive path or a UNC path.

•·        SOURCE_DSN is the ODBC data source name to use when executing the underlying data source query (in this case, it will be an ODBC DSN called AS400).

•·        CREATECUBE is the statement that defines the structure of the cube, including the measures and dimensions. A tutorial on this topic would be extensive, but I will give a hint on an easy way to do this! After conceptually designing my local cube and building a supporting SQL statement, I use the Microsoft Query cube wizard to build this statement for me! (This method is outlined in the previous article.) The file name for an OLAP query created by MS Query is .OQY. Once you've created an .OQY file, simply open it with Notepad and extract the CREATECUBE section.

•·        INSERTINTO is the statement that populates the cube from the supplied SQL statement. The DB2 SQL joins various tables to get all the relevant data for the cube. As a side note, if your dimension columns have the possibility of containing a NULL, it is a good idea to modify your SQL to use a function such as COALESCE to replace NULLs with a value such as *Undefined*. Also notice here that the number and sequence of columns in the SELECT statement should correspond with the cube's columns.

 

With a mammoth connection string like that, it's no wonder all the work is done when the connection is opened!

What to Do with the Local Cube File

Once a cube file is created, there are a number of options for getting the data to the users. Here are a few ideas:

1.      Cube files can be opened directly by Excel using the File-Open dialog. Unfortunately, the Excel installation process doesn't automatically associate the cube (.CUB) extension with the Excel application. However, this can be easily remedied by associating Excel with a .CUB file extension using Windows Explorer. Also, if Excel squawks about a data source being potentially unsafe, just tell Excel to "get over it" and move on. When opening a cube file directly, Excel will present an empty pivot table.

2.      Cube files can be placed on a network drive for access by Excel users. If my memory serves me, though, with Excel 2000 only one user at a time can access a cube file.

3.      The cube creation script can be enhanced to zip and distribute cube files to users via email. This is a good solution for road warrior sales personnel or busy execs who can't necessarily connect directly to the DB2 server but may want to analyze current numbers.

4.      If the network configuration allows, copy the cube file right to a user's "My Documents" folder for easy access.

5.      Create a pre-built spreadsheet with pivot tables and pivot charts that reference the cube data on a network share. This option alleviates the need to have users start the pivot table process every time they open a cube file. In fact, a workbook can be created that has several predefined pivot table views that can serve as a starting point for users.

6.      It is a good idea to schedule the cube to be rebuilt automatically for a sensible period of time (depending on the application) such as daily, weekly, or monthly.

 

Number Crunching the Fun Way

The combination of OLAP cubes and pivot tables is compelling because it allows users to create their own report variations with existing tools. This allows developers to do more useful things than writing a million variations of a single report. The cube file also allows quite a bit of data to be analyzed without having to purchase an OLAP product.

 

OLAP cubes allow DB2 users to crunch data offline in a flexible and easy-to-use format. With a little training, the bean counters and sales reps in your company will love them!

 

Sample VBScript (CreateSalesCube.vbs) Code Required to Build a Cube File

 

'

' CreateSalesCube.VBS

'

'

'

' This script is intended to build

' a local OLAP cube file (.CUB) from

' "DB2 for i" data on a regular basis.

'

'

' Michael Sansoterra    09/20/2008

'

'

'

'

' Build Connection String

' (4 Components required for MSOLAP provider)

'

' 1.  Location of Cube

'

Dim ConnLocation

ConnLocation="LOCATION=C:NorthwindExample.cub;"

'

' 2.  ODBC Data Source Name

'     (Watch for those embedded double quotes!)

'

'     Place your own DSN name, credentials and other

'     connection string keywords here.

'

'

'     This example assumes AS400 uses the iSeries Access

'     (aka System i Access) ODBC Driver

'

Dim ConnDSN

ConnDSN="SOURCE_DSN=""DSN=AS400;UID=USERID;PWD=PASSWORD"";"

'

' 3.  Create Cube Statement (Define Dimensions & Measures)

'

Dim ConnCreateCube

ConnCreateCube = _

"CREATECUBE=CREATE CUBE [OrderCube] (" & _

"DIMENSION [Customer]," & _

"    LEVEL [All] TYPE ALL," & _

"    LEVEL [CompanyName]," & _

"DIMENSION [Country]," & _

"    LEVEL [All] TYPE ALL," & _

"    LEVEL [Country]," & _

"    LEVEL [Region], " & _

"DIMENSION [Product]," & _

"    LEVEL [All] TYPE ALL," & _

"    LEVEL [ProductName]," & _

"DIMENSION [Supplier]," & _

"    LEVEL [All] TYPE ALL," & _

"    LEVEL [CompanyName1]," & _

"DIMENSION [Category]," & _

"    LEVEL [All] TYPE ALL," & _

"    LEVEL [CategoryName]," & _

"DIMENSION [OrderDate] TYPE TIME," & _

"    LEVEL [All] TYPE ALL," & _

"    LEVEL [Year] TYPE YEAR," & _

"    LEVEL [Quarter] TYPE QUARTER," & _

"    LEVEL [Month] TYPE MONTH," & _

"   MEASURE [Quantity]    FUNCTION SUM," & _

"   MEASURE [Ext Price]   FUNCTION SUM," & _

"   MEASURE [Highest Price] FUNCTION MAX);"

'

' 4. Insert Data into Cube

'

Dim ConnInsertCube

ConnInsertCube="INSERTINTO=INSERT INTO OrderCube(" & _

"[Quantity], [Ext Price], [Highest Price], [CompanyName], " & _

"[Country].[Country], [Region], [ProductName], " & _

"[CompanyName1], [CategoryName], [OrderDate])  " & _

"OPTIONS ATTEMPT_ANALYSIS " & _

"SELECT OD.Quantity, " & _

"           OD.UnitPrice*OD.Quantity ExtPrice1," & _

"           OD.UnitPrice*OD.Quantity ExtPrice2," & _

"           CS.CompanyName, CS.Country," & _

"           CS.Region, PD.ProductName," & _

"           SP.CompanyName," & _

"           CT.CategoryName, OH.OrderDate" & _

"      FROM Northwind.OrderDetails OD " & _

"INNER JOIN Northwind.Orders       OH ON OH.OrderID=OD.OrderID " & _

"INNER JOIN Northwind.Products     PD ON PD.ProductID=OD.ProductID " & _

"INNER JOIN Northwind.Suppliers    SP ON SP.SupplierID=PD.SupplierID " & _

"INNER JOIN Northwind.Customers    CS ON CS.CustomerID=OH.CustomerID " & _

"INNER JOIN Northwind.Categories   CT ON CT.CategoryID=PD.CategoryID "

'

' Define ADO Connection Object

' Set the connection provider to MSOLAP

'

Dim Connection

Set Connection = CreateObject("ADODB.Connection")

Connection.Provider = "msolap"

'

' Combine 4 components of the MSOLAP connection string

' into one

'

Connection.ConnectionString = _

    ConnLocation & _

    ConnDSN & _

    ConnCreateCube & _

    ConnInsertCube

'

' Open the connection (this will create the cube and

' populate the cube from the remote data source.  The

' provider works to pre-aggregate the cube's measures by

' the various combinations of the cube's dimensions)

'

Connection.Open

'

' Close The Connection

'

Connection.Close

Set Connection=Nothing

'

' Signal user the script is done

'

MsgBox "Cube has been created!"

Michael Sansoterra is a DBA for Broadway Systems in Grand Rapids, Michigan. He can be contacted at sqlsleuth@gmail.com.


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    In this Webinar, we'll address some of the biggest myths about RPG Open Access, including:

    • Modernizing with RPG OA requires significant changes to the source code
    • The RPG language is outdated and impractical for modernizing applications
    • Modernizing with RPG OA is the equivalent to "screen scraping"

     

  • Time to Remove the Paper from Your Desk and Become More Efficient

    SB_HelpSystems_WC_GenericToo much paper is wasted. Attempts to locate documents in endless filing cabinets.And distributing documents is expensive and takes up far too much time.
    These are just three common reasons why it might be time for your company to implement a paperless document management system.
    Watch the webinar to learn more and discover how easy it can be to:

    • Capture
    • Manage
    • And distribute documents digitally

     

  • IBM i: It’s Not Just AS/400

    SB_HelpSystems_WC_Generic

    IBM’s Steve Will talks AS/400, POWER9, cognitive systems, and everything in between

    Are there still companies that use AS400? Of course!

    IBM i was built on the same foundation.
    Watch this recorded webinar with IBM i Chief Architect Steve Will and IBM Power Champion Tom Huntington to gain a unique perspective on the direction of this platform, including:

    • IBM i development strategies in progress at IBM
    • Ways that Watson will shake hands with IBM i
    • Key takeaways from the AS/400 days

     

  • Ask the RDi Experts

    SB_HelpSystems_WC_GenericWatch this recording where Jim Buck, Susan Gantner, and Charlie Guarino answered your questions, including:

    • What are the “hidden gems” in RDi that can make me more productive?
    • What makes RDi Debug better than the STRDBG green screen debugger?
    • How can RDi help me find out if I’ve tested all lines of a program?
    • What’s the best way to transition from PDM to RDi?
    • How do I convince my long-term developers to use RDi?

    This is a unique, online opportunity to hear how you can get more out of RDi.

     

  • Node.js on IBM i Webinar Series Pt. 2: Setting Up Your Development Tools

    Profound Logic Software, Inc.Have you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application. In Part 2, Brian May teaches you the different tooling options available for writing code, debugging, and using Git for version control. Attend this webinar to learn:

    • Different tools to develop Node.js applications on IBM i
    • Debugging Node.js
    • The basics of Git and tools to help those new to it
    • Using NodeRun.com as a pre-built development environment

     

     

  • Inside the Integrated File System (IFS)

    SB_HelpSystems_WC_GenericDuring this webinar, you’ll learn basic tips, helpful tools, and integrated file system commands—including WRKLNK—for managing your IFS directories and Access Client Solutions (ACS). We’ll answer your most pressing IFS questions, including:

    • What is stored inside my IFS directories?
    • How do I monitor the IFS?
    • How do I replicate the IFS or back it up?
    • How do I secure the IFS?

    Understanding what the integrated file system is and how to work with it must be a critical part of your systems management plans for IBM i.

     

  • Expert Tips for IBM i Security: Beyond the Basics

    SB PowerTech WC GenericIn this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

    Don't miss this chance to take your knowledge of IBM i security beyond the basics.

     

     

  • 5 IBM i Security Quick Wins

    SB PowerTech WC GenericIn today’s threat landscape, upper management is laser-focused on cybersecurity. You need to make progress in securing your systems—and make it fast.
    There’s no shortage of actions you could take, but what tactics will actually deliver the results you need? And how can you find a security strategy that fits your budget and time constraints?
    Join top IBM i security expert Robin Tatam as he outlines the five fastest and most impactful changes you can make to strengthen IBM i security this year.
    Your system didn’t become unsecure overnight and you won’t be able to turn it around overnight either. But quick wins are possible with IBM i security, and Robin Tatam will show you how to achieve them.

  • How to Meet the Newest Encryption Requirements on IBM i

    SB PowerTech WC GenericA growing number of compliance mandates require sensitive data to be encrypted. But what kind of encryption solution will satisfy an auditor and how can you implement encryption on IBM i? Watch this on-demand webinar to find out how to meet today’s most common encryption requirements on IBM i. You’ll also learn:

    • Why disk encryption isn’t enough
    • What sets strong encryption apart from other solutions
    • Important considerations before implementing encryption

     

     

  • Security Bulletin: Malware Infection Discovered on IBM i Server!

    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.

     

     

  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

     

     

     

  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.

     

  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.

     

     

  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.

     

     

  • Node Webinar Series Pt. 1: The World of Node.js on IBM i

    SB Profound WC GenericHave you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application.
    Part 1 will teach you what Node.js is, why it's a great option for IBM i shops, and how to take advantage of the ecosystem surrounding Node.
    In addition to background information, our Director of Product Development Scott Klement will demonstrate applications that take advantage of the Node Package Manager (npm).
    Watch Now.

  • The Biggest Mistakes in IBM i Security

    SB Profound WC Generic The Biggest Mistakes in IBM i Security
    Here’s the harsh reality: cybersecurity pros have to get their jobs right every single day, while an attacker only has to succeed once to do incredible damage.
    Whether that’s thousands of exposed records, millions of dollars in fines and legal fees, or diminished share value, it’s easy to judge organizations that fall victim. IBM i enjoys an enviable reputation for security, but no system is impervious to mistakes.
    Join this webinar to learn about the biggest errors made when securing a Power Systems server.
    This knowledge is critical for ensuring integrity of your application data and preventing you from becoming the next Equifax. It’s also essential for complying with all formal regulations, including SOX, PCI, GDPR, and HIPAA
    Watch Now.

  • Comply in 5! Well, actually UNDER 5 minutes!!

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    Produce bar code labels, electronic forms, ad hoc reports, and RFID tags – without programming! MarkMagic is the only document design and print solution that combines report writing, WYSIWYG label and forms design, and conditional printing in one integrated product.

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.