1 / 22

SSIS Dataflow Performance Tuning Jamie Thomson

Learn about buffer architecture in SSIS dataflow, differentiate synchronous and asynchronous components, and explore general tuning tips for optimal performance. Discover execution trees, design strategies, fast parsing, and identification of bottlenecks in data processing.

jennies
Download Presentation

SSIS Dataflow Performance Tuning Jamie Thomson

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SSIS Dataflow Performance Tuning • Jamie Thomson

  2. SSIS Dataflow Performance Tuning • Buffer Architecture • Design for perf! • General tuning tips

  3. Buffer Architecture

  4. What is a buffer? • An area of memory • Created by asynchronous components • Does not move or change shape • Data in a buffer can be changed by components • Is what you see in a data viewer

  5. Demo 1 • What is a buffer

  6. Buffer Architecture • Synchronous • Aka Row transformations • Asynchronous • Partially blocking • Fully blocking

  7. Synchronous components • Same buffer used for input and output • Number of rows in = Number of rows out • Generally very quick • Examples: • Derived Column • Conditional Split • Multicast

  8. Asynchronous components • Creates new buffers for output • Different “shaped” input and output buffers • Number of rows in <> Number of rows out • Generally slower • Examples: • Aggregate • Sort

  9. Execution trees • …is a section of data flow starting from an asynchronous output and terminating at inputs on transforms that have no synchronous outputs • -Kirk Haselden, P546 of “Microsoft SQL Server Integration Services”

  10. Demo 2 • Synchronous and Asynchronous components • (Count the expression trees)

  11. Execution trees

  12. Inside an execution tree – What we think happens Buffers don’t move

  13. Inside an execution tree – What actually happens

  14. Design for perf!

  15. “The Data Flow Task is performant by design, without any tuning or optimization the default settings generally deliver great performance” • Kirk Haselden, Microsoft SQL Server 2005 Integration Services, Chapter 23 – Data Flow Task Internals and Tuning

  16. Only do what you have to • Remove unrequired columns (heed the warnings) • Fixed-width files – only parse what you need • ALWAYS use a SQL statement • Only parse when needed (or leave as strings)

  17. Demo 3 • Parse at source or in flow • Lookups vs Merge Joins

  18. General tuning tips!

  19. Use FastParse if possible • Turn off OnPipelineRowsSent • Let the database do what its good at • Raw files • 64bit

  20. Keep columns narrow • Point BufferTempStoragePath/BLOBTempStoragePath at fast drives • Increase DefaultBufferMaxSize & DefaultBufferMaxRows • Optimise the destination (fast load, table lock, simple/bulk logged recovery/disable indexes) • Identify bottlenecks

  21. Demo 4 • Chaining expression components • Redirect or Passthrough in a Lookup • Fast Parse

  22. Further reading • SSIS Performance Tuning Whitepaper – by Elizabeth Vitt et al • Microsoft SQL Server 2005 Integration Services (Chapter 23) by Kirk Haselden

More Related