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Copyright 1998 by SAS Institute Hybrid OLAP, Techniques for Viewing Structures Richard Doherty SAS Institute European HQ
Copyright 1998 by SAS Institute
Hybrid OLAP,Techniques for
Viewing Structures
Richard Doherty
SAS InstituteEuropean HQ
Copyright 1998 by SAS Institute
Agenda
• HOLAP overview
• Viewing technologies– SAS/EIS– SAS/IntrNet MDDB Report Viewer– SWAN Java applet builder
• Demonstration• Summary
Copyright 1998 by SAS Institute
HOLAP overview
• What is Hybrid OLAP (HOLAP)?
• Why is it so good?
Copyright 1998 by SAS Institute
What is HOLAP?
• HOLAP takes the best features fromMultidimensional OLAP (MOLAP) andRelational OLAP (ROLAP)
• MOLAP applications typically exploit single“cubes”– SAS/EIS Multidimensional report
• ROLAP applications exploit relational datastores– SAS/EIS Motore extension
Copyright 1998 by SAS Institute
What is HOLAP?
• HOLAP applications exploit multiple cubesand relational data stores on multiple serverstransparently.
• OK, but what’s good about that?
Copyright 1998 by SAS Institute
What is HOLAP?
• Users of classic MOLAP were faced with twoissues:– optimising performance– enhancing scalability
Copyright 1998 by SAS Institute
MOLAP issues
A typical C/S packaged OLAP implementationlooked something like this:
MDDB
Model
Viewer
Client/Server Remote Library Services
Copyright 1998 by SAS Institute
The Answer - HOLAP
Model
Viewer
Model
Viewer
Model
Viewer
DATA PROVIDER Cache
Client/Server
Client/Server
Copyright 1998 by SAS Institute
Optimum performance
• HOLAP utilises the servers’ computeresources
• Only the results are downloaded
Copyright 1998 by SAS Institute
Enhanced scalability
• Data source can be a combination ofdatasets, views & MDDBs (star schemasupport)
• Larger sub-cubes can be stored in datasets
Copyright 1998 by SAS Institute
HOLAP viewing technologies
• SAS/EIS
• SAS/IntrNet MDDB Report Viewer
• SWAN Java applet builder
Copyright 1998 by SAS Institute
SAS/EIS
• Mature technology
• Rich functionality• Many different OLAP report types
• Fully customisable• Thick client
Copyright 1998 by SAS Institute
SAS/Intrnet MDDB ReportViewer
• Thin client
• CGI based• Low specification client
• Web browser• No JVM required
• Light load time• Light functionality
Copyright 1998 by SAS Institute
Copyright 1998 by SAS Institute
SWAN
• Software Without A Name
• Work in progress• 100% pure JAVA application
• JAVA OLAP applet builder– talks to the HOLAP model– rich functionality set– web browser (with JAVA Activator)– easy distribution– JDK1.1
Copyright 1998 by SAS Institute
SWAN
• Internationalisation
• Drill/expand• Rotate
• Business graphics• Multiple browser support
• Computed columns• ……..
Copyright 1998 by SAS Institute
SWAN
• Thin-client reporting solution for the Web
• Empowers users throughout an organisationto explore and analyse multidimensionalbusiness data
• Enables an IT department to maintain data oncentralised servers
• Incorporates a scalable client/serverarchitecture for accessing the data
Copyright 1998 by SAS Institute
SWAN server
• Reports do not store any data from MDDBs - databeing displayed is always live
• Server running SAS/EIS handles all of thecomputation and sends data as the report requests it
• Report minimises network traffic by requesting datafrom the server only when it is needed
• HOLAP MDDBs allow the reports to display data fromany data source understood by the SAS System
Copyright 1998 by SAS Institute
DemonstrationDemonstration
Copyright 1998 by SAS Institute
Summary
• Different viewing techniques available
• Each method has its own advantages
• Analyse user requirements and decide whichtechnology is appropriate
Copyright 1998 by SAS Institute
Questions?Questions?
