An Overview of Data Warehousing and OLAP Technology › dbsystems › Lectures ›...
Transcript of An Overview of Data Warehousing and OLAP Technology › dbsystems › Lectures ›...
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Prabhjot Singh
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Data Warehousing and OLAP
Architecture of DW
Backend Tools and Utilities
Conceptual Model and Front End Operations
Database Design Methodology
Warehouse Servers
Metadata and Warehouse Management
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Integrate Data
Multiple Heterogeneous Sources
Support Analytical Reporting
Decision Making
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On-line Analytical Processing
Use DW data to analyze information
Data divided into cubes
Numeric Facts – Measures
Categorized by Dimensions
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Data Cleaning/Transforming
Loading – Full and Incremental Load
Refreshing – Updates in Source Data
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Multidimensional data model (Cube)
Pivoting
Rollup
Drill Down
Slice and Dice
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Star Schema – Single Fact Table and Single Table for each dimension
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Snowflake Schema – Refinement of Star, dimension tables are normalized.
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Basis for
comparison
ROLAP MOLAP
Storage & Fetched
Data stored and fetched from main data warehouse.
Data stored and fetched from the MDDBs.
Data Form Relational tables. Large multidimensional array made of data cubes.
Data volumes
Large data volumes. Limited summaries data is kept in MDDBs.
View Creates a multidimensional view of data dynamically.
Already stores the static multidimensional view of data in MDDBs.
Access Slow access. Faster access.
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Types of Metadata: • Administrative Metadata
• Business Metadata
• Operational Metadata
Metadata Repository • Store and Manage
• Share among tools
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Thank You!