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Data Warehousing Features in SQL Server 2008

Data Warehousing Features in SQL Server 2008

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Data Warehousing Features in SQL Server 2008

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  1. Data Warehousing Features in SQL Server 2008 James Rowland-Jones @jrowlandjones

  2. Official DW Feature Set in SQL 2008

  3. JRJ’s DW Feature Set in SQL 2008

  4. What We’ll Focus On

  5. Data Compression • Enterprise Edition Only • Row and Page Compression • Compression Ratio 2 to 1 or 3 to 1 - 50% to 70% reduction in data • Can be for a table, index or a subset of their partitions • Estimate savings: exec sp_estimate_data_compression_savings • Max row size plus compression overhead must not exceed 8060 bytes

  6. Compression Alert UNCOMPRESSED TEXT Compressed Table

  7. Monitoring Compression • SQL Server, Access Methods Object • Page compression attempts/sec • Pages compressed/sec • Compression Statistics for individual Partitions • Dynamic Management Function • sys.dm_db_index_operational_stats

  8. Resource Governor (Quickly) Data Compression DEMO TIME

  9. P & P Partitioning Parallelism

  10. Partitioning & Parallelism • Partition Table Parallelism • Few Outer Rows Parallelism • Partition-Aligned Indexed Views • SQL 2005 behaviour – needs to be dropped before switch • Switch Partition Pulls across indexed view • Rebuild index partition

  11. What is a Partitioned Table? P1 P2 P3 P4

  12. The “Problem” in SQL 2005

  13. Partitioning & Parallelism Compared SQL Server 2005 P1 P2 P3 P4 P2 SQL Server 2008 P1 P2 P3 P4 P2

  14. Work Around for SQL Server 2005 Partition 3 • UNION Partition 4

  15. Few Outer Rows Parallelism SELECT d.Date_Desc ,SUM(f.Sale_Amt*f.Sales_Qty) FROM Tbl_Fact_Store_Sales f JOIN Tbl_Dim_Date d ON f.sk_date_id = d.sk_date_id WHERE d.date_value between '10/1/2004' and '10/7/2004' GROUP BY d.Date_Desc • SQL 2005 • One thread given per page of rows on a nested loop join • SQL 2008 • One thread given per row on a nested loop join • Good for Joins to Date Dim • M$ internal DW Scale Benchmark perf increase by 30%

  16. Work-Around’s for SQL Server 2005 • STUFF YOUR ROW • Add a JUNK Col on the Date dimension to force one row per page • CLUSTER ON A GUID • Add a column and populate with GUIDs to encourage Rows onto separate pages

  17. Partition Aligned Indexed Views • The Big Chore was “Sliding” a table with an indexed view on it. • In 2005 this needed to be dropped • In 2008 it does not 

  18. Sliding Window with Indexed View in Place Rebuild Partitioned Index Filtered Indexes IT’s DEMO TIME

  19. STAR JOINS “Optimized” Bitmap Filters • What is a Bitmap filter • In memory structure (no index overhead) • Created dynamically • Typically quite small in size • Bitmap Filter SQL 2005 • What it was in 2005... • Hash or Merge JOIN • Optimised Bitmap Filter SQL 2008 • Enterprise Edition • Parallel Query • Hash JOIN only • Fact table must have > 100 pages • Single Column join (No PK FK relationship requirement)(integer needed for optimized) • Dimension input cardinalities are smaller than fact input cardinalities • Look for Bitmap warning event for missed opportunities to use Bitmap

  20. Minimally Logged Inserts & TF 610

  21. Bulk Load Methods Compared

  22. STAR JOINS Minimally Logged INSERTS FOR THE FINAL TIME