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PG2 Cognos TM1: An Introduction to Design, Maintenance and Performance Tuning


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An introduction into Cognos TM1. For more information on Cognos TM1, visit

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PG2 Cognos TM1: An Introduction to Design, Maintenance and Performance Tuning

  1. 1. Cognos TM1- An Introduction: Design, ® Maintenance and Performance Tuning Webinar September 10th, 2009 Click
 Sanjeev Data Consultant for PerformanceG2 9/2/09

  2. 2. Connect with us Call us: 877.742.4276 Email Us: Visit our Web site: Watch our Cognos videos at: Click
 Follow us: Read our blog: Upcoming Events:
  3. 3. IBM Cognos TM1 - Overview September 10th, 2009 9/2/09

  4. 4. Session Objectives Understanding TM1 – Overview Design - Demo 1 TM1 Implementation Methodology – Project Management Advanced Users – Demo 2 Maintenance & Performance Tuning Integration with Cognos 8 – Demo 3 Best Practice Q&A 9/2/09

  5. 5. What is Table Manager (TM) 1? High Performance OLAP Engine suited for Planning, Budgeting, Forecasting and Data Analysis Designed for “Write-back” capabilities –> “What – if” scenario modeling 64 bit, In-memory (RAM) multidimensional server Delivers “On-Demand” , Real-Time results in highly volatile (constantly changing) environments 9/2/09

  6. 6. TM1 Components TM 1 Server TM1 Perspectives  Excel add-on TM1 Architect Turbo Integrator (TI) TM1 Excel TM1 Web TM1 Executive Viewer 9/2/09

  7. 7. Design - Demo 1 9/2/09

  8. 8. Implementation Methodology – 5 phase process 9/2/09

  9. 9. PHASE 1: Analysis Goal Definition Role Enumeration Requirement Gathering Infrastructure Assessment Risk Assessment 9/2/09

  10. 10. PHASE 2a: Model Definition Cube Factoring Dimension Factoring Schema Capture Business Rules 9/2/09

  11. 11. PHASE 2b: Metadata Definition Sources Granularity Hierarchies Attributes Naming Standards 9/2/09

  12. 12. PHASE 2c: Metadata Definition/User Interface Measures – Dimensions and Elements Version Handling Role-based Optimization Define Default Views Define Security Model 9/2/09

  13. 13. PHASE 3: Construction Create Objects Initialize Data & Metadata Create Business Logic Build UI Implement Security Model 9/2/09

  14. 14. PHASE 4: Deployment Technology Install Verify Correctness of Dimension Hierarchies and Rules Validation and User Acceptance Testing (UAT) User Training (model-specific) Support Training (model – specific) 9/2/09

  15. 15. PHASE 5: Administration Backup Plan System Documentation User Documentation 9/2/09

  16. 16. Advanced Users - Demo 2 9/2/09

  17. 17. TM1 – Performance Tuning Area Technique Server Server Memory • StarGate Views (SGV) • }CubeProperties Control Cube • Tuning RAM Database • ReadersBypassWriters (tm1s.cfg) • Locking • Batch Updates • TI Functions Spreadsheet Worksheet Functions 9/2/09

  18. 18. Performance Tuning – StarGate Views Calculated & Stored subsections of a TM1 Cube Contains only data for a defined section of the cube Are effectively “sub-cubes” created in server memory Smaller than entire cube – Requires less server memory Allows quicker Access to Cube Data 9/2/09

  19. 19. Performance Tuning – StarGate Views Allows any slice worksheets containing a VIEW function to remain functional but the function does not generate SGV Allows TM1 to retrieve a calculated value from a SGV stored in memory Faster retrieval time improves performance 9/2/09

  20. 20. Performance Tuning – }CubeProperties Control Cube View Maximum Memory (VMM) View Minimum Time (VMT) 9/2/09

  21. 21. Performance Tuning – }CubeProperties Control Cube 9/2/09

  22. 22. Performance Tuning – Tuning RAM Modify the boot.ini file (to the correct partition, if available) Add “/3GB” switch to the end of the last line of boot.ini Reboot the physical server on which the TM1 server runs 9/2/09

  23. 23. Performance Tuning – Database Techniques ReadersBypassWriters (tm1s.cfg) –> ReadersBypassWriters=T Locking -> Locks read/write during TI process executions Batch Updates -> Holding on to multiple changes and executing them in a batch process all at once TI Functions-> LockOff -> Turns off server locking BatchUpdateStart -> Enables Batch Updates (Lock off) LockOn ->Restores Server Locking BatchUpdateFinish -> Server exists Batch Update mode 9/2/09

  24. 24. Performance Tuning – Worksheet Functions DBR – Function is executed and resolved before all other DB Functions DBRW – Similar to DBR Function, but reduces Network traffic and may improve performance on Wide Area Networks ELCOMP – Similar to DBR Function in that it retrieves a value from a specified TM1 cube but it also results in a round trip between the Server and Excel Workbook_Open Event – A built-in workbook even that runs its macro code each time you manually open the workbook. 9/2/09

  25. 25. Integration with Cognos 8 – Demo 3 9/2/09

  26. 26. Best Practices TM1 words must contain no less than 2 and no more than 256 dimensions Many TM1 functions reference the element index values. Changing the order of elements in a dimension can return new and possibly unexpected values for any functions that reference the involved elements (show formula and less than 2 and no more than 256 example) Rule override consolidations – must be a member of ADMIN group to write/edit rules 9/2/09

  27. 27. Best Practices (con’t) Rules take precedence over consolidations within dimensions Del bib file from data directory folder when you are using another text editor for rules as this will cause discrepancies Consolidations defined in dimensions are calculate much more quickly than rules-derived values, especially in very large, sparse cubes 9/2/09

  28. 28. Q&A Session 9/2/09

  29. 29. Connect with us Call us: 877.742.4276 Email Us: Visit our Web site: Watch our Cognos videos at: Follow us: Read our blog: Upcoming Events:
  30. 30. Thank your for attending our Webinar! 9/2/09