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Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
Dimensional modeling in oracle sql developer
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Dimensional modeling in oracle sql developer

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An overview of dimensional data modeling with examples of how to build a dimensional model in Oracle SQL Developer Data Modeler

An overview of dimensional data modeling with examples of how to build a dimensional model in Oracle SQL Developer Data Modeler

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  • Summary levels can be define for basic measure – not exported to Oracle OLAP
  • Transcript

    • 1. 1 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 2. Dimensional Modeling in Oracle SQL Developer Data Modeler Philip Stoyanov Senior Software Development Manager 2 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 3. Legal The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle‟s products remains at the sole discretion of Oracle. 3 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 4. Agenda   Reporting  4 Dimensional model Dimensions in physical model for Oracle Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 5. Models Data Types Model Subject Area 1 Subject Area n Relational Model 1 Process Model Data flow diagramming Logical Model 5 … Subject Area 1 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Dimensional Models 1..n Subject Area n … … Relational Model n DB Site 1 Oracle 9i … DB Site n Oracle 12c DB Site 1 DB2/390 v.8 … DB Site n MS SQLS 2005
    • 6. Relational model without relationships  Even if we add foreign keys still there are dependencies that remain hidden 6 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 7. Dimensional model can show more Extends definitions in Logical and Relational models – additional 1:1 and 1:n dependencies in the scope of one table can be described 7 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 8. Can be mapped to Logical or Relational model  Relational model – direct mappings to tables and views  Logical model – used entities need to be engineered to relational model in order to have mapping to specific tables 8 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 9. Dimensional model elements  Dimension  Level  Hierarchy  Link  Cube  Measure  Slice – subset of cube dimensions and measures Oracle names (short, long, plural) can be defined for each element and exported to Oracle OLAP 9 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 10. Dimension  Can be Regular or Time  Consists of levels and hierarchies  Concept of merging dimensions is supported – hierarchies can span levels from more than one dimension  Dimension has one base level that defines dimension‟s grain 10 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 11. Merging dimensions example  Level “Sales Territory Region” belongs to three dimensions 11 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 12. Level  Level is mapped to exactly one entity (table or view). Several levels can be mapped to one entity  Can be Regular level or level that represents value based (parent-child) hierarchy  Has a key defined over one or several attributes  Has descriptive attributes that map to exactly one column from dimension table 12 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 13. Level  Mapping of optional short description and long description attributes can be defined and mapping of mandatory „time span” and “time end” attributes should be defined for level belonging to time dimension  Has calculated attributes – expressions over dimension table columns  Value based hierarchy is defined with “level key” and “parent key” attributes  Member selection criteria can be defined 13 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 14. Level - calculated attribute 14 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 15. Hierarchy  Defines roll-up path and can connect levels belonging to different dimensions (merging dimensions)  Hierarchies are built and modified automatically during the process of connecting levels and dimension node  Three types of hierarchies – Parent-Child (value based hierarchy), Level based and Ragged  Joins are defined for levels mapped to different tables 15 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 16. Hierarchy Hierarchy is created when dimension shape is connected (using “New Link”) to base level. 16 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 17. Link Used to define hierarchies and dimension usage. Child to parent attributes can be defined when link connects levels defined on different entities 17 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 18. Value based hierarchy Level is used to define key, parent key and descriptive attributes 18 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 19. Ragged hierarchy Corresponds to skip level hierarchy in Oracle OLAP – use “New Ragged Hierarchy Link” tool in order to mark and represent a “jump” over level(s) – dashed green link below 19 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 20. Dimension usage   20 link between cube and dimension – defines child to parent attributes (join of fact entity to base level of dimension), whether it‟s role playing dimension and other related properties Separate dimension is created in Oracle OLAP for each role playing dimension Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 21. Cube  Defines fact entities and joins between them  Container for measures defined on facts from fact entities  Defines dimensions usage and joins to dimensions – support for role playing dimensions  Container for “Slices” based on cube definition Cube defined on two fact entities: FactInternetSales and FactResellerSales • • • 21 Copyright © 2013, Oracle and/or its affiliates. All rights reserved. Abbreviations: A – measure based on fact FX – measure based on formula expression R – reference to dimension
    • 22. Cube - partitioning  Partitioning dimension, hierarchy, level  Settings for composites 22 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 23. Cube – summary levels (pre-compute) 23 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 24. Measure  Measure can be based on single fact (direct mapping to column) or expression involving facts and other measures  Measure can be Full-Additive, Semi-Additive or NoneAdditive  One (at least) or more aggregation functions can be defined for Full-Additive and Semi-Additive measure.  Semi-Additive measure has a list of dimensions on which it is valid 24 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 25. Basic measure 25 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 26. Calculated measure 26 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 27. Reports  There are no standard reports for Dimensional model  Custom reports integrated in Search functionality can be created – two levels of details are supported for cubes and dimensions (in Data Modeler 4.0)  Custom reports can be generated in HTML, PDF or Excel format; the latter one can be used to change properties in Excel file and then to import them back into model 27 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 28. Custom report template 28 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 29. Custom report – dimensions with details for hierarchies and levels 29 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 30. Dimensional Model - usage  Communication with customers – custom reports, detailed and compact diagrams – for compact diagram use “Show Compact model” in context menu for dimensional model node in the browser  Can be exported to Oracle AW  Dimensions in Oracle physical model can be created using “Engineer to Oracle Model” functionality 30 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 31. Detailed diagram 31 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 32. Compact diagram 32 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 33. Dimensions in Oracle physical model  Used by database engine for query rewrite related to materialized views  Can be imported from database dictionary or DDL script 33 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 34. SQL Dimension 34 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 35. Dimension – physical model   35 Dimensions, levels and hierarchies can be created/edited manually Can be used as starting point to create new Dimensional model Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 36. Dimensional model – engineer from physical model 36 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 37. Dimensional model – based on Sales History (SH) sample schema 37 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 38. Example Oracle SQL Developer Data Modeler 3.3 (4.0) is distributed with sample design and complementary description located in datamodelerdatamodelersamplesDimensional_model directory 38 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 39. Learn More..  SQL Developer Data Modeler on OTN - http://www.oracle.com/technetwork/developer-tools/datamodeler  SQL Developer Data Modeler forum https://forums.oracle.com/community/developer/english/development_to ols/application_development_in_pl_sql/sql_developer_data_modeler  Oracle Learning Library http://apex.oracle.com/pls/apex/f?p=44785:2:0:FORCE_QUERY::2,RIR ,CIR:P2_TAGS:Data%20Modeler  Jeff Smith http://www.thatjeffsmith.com/  Ashley Chen http://oracletoolsgirl.blogspot.co.uk/  Kris Rice http://krisrice.blogspot.co.uk/ 39 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 40. 40 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
    • 41. 41 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.

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