James Serra – Data Warehouse/BI/MDM Architect

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Presentation transcript:

James Serra – Data Warehouse/BI/MDM Architect

Agenda  Why use a data warehouse?  Fast Track Data Warehouse (FTDW)  Appliances  Data Warehouse vs Data Mart  Kimball vs Inmon (Normalized vs Dimensional)  Populating a Data Warehouse  ETL vs ELT  Normalizing and Surrogate Keys  SSAS Cubes  SQL Server 2012 Tabular Model  End-User Microsoft BI Tools

Software: SQL Server 2008 R2 Enterprise Windows Server 2008 Hardware: Tight specifications for servers, storage and networking ‘Per core’ building block Configuration guidelines: Physical table structures Indexes Compression SQL Server settings Windows Server settings Loading

Data Warehouse vs Data Mart

 Normalized (Inmon) vs Dimensional (Kimball)  Normalized:  Normalization rules  Many tables using joins  Dimensional:  Facts and dimensions  Less tables having duplicate data (de-normalized)  Easier for user to understand Kimball vs Inmon

 Frequency of data pull  Full Extraction – All data  Incremental Extraction – Only data changed from last run  Determine data that has changed  Timestamp - Last Updated  CDC  Partitioning  Triggers  MERGE  Online Extraction – Data from source  Replication  Database Snapshot  Availability Groups  Offline Extraction – Data from flat file Populating a Data Warehouse

ETL vs ELT

Normalizing and Surrogate Keys

Reasons to use instead of data warehouse:  Aggregating (Summarizing) the data for performance  Multidimensional analysis – slice, dice, drilldown  Hierarchies  Advanced time-calculations – i.e. 12-month rolling average  Easily use Excel to view data  Slowly Changing Dimensions (SCD) SSAS Cubes

Data Warehouse Architecture

 New xVelocity in-memory database in SSAS  Build model in Power Pivot or SSDT  Uses existing relational model  No star schema, no extra SSIS  Uses DAX  Faster and easier to use than multidimensional model SQL Server 2012 Tabular Model

 Excel PivotTables  SQL Server Reporting Services (SSRS)  Report Builder  PowerPivot  PerformancePoint Services (PPS)  Power View End-User Microsoft BI Tools