1. Smaller is Better ישי גרין| ראש צוות DBA| הבורסה לניירות ערך

2. Data Compression – Why bother? Physical Compression Methods Logical Compression Methods

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7. Data Compression – Whybother? The bigger the data – the bigger the challenges

9. Loading data volumes

10. Archiving

11. Maintenance (backups, fragmentation, statistics, data replications…)

14. Better: Archive data to flat files or other media (BCP out)

16. Index levelBackup Compression Compression Methods Row Compression Page Compression

17. Data compression (SQL 2008) Row Compression Storing fixed-length data types in variable-length storage format. A compressed row uses 4 bits per compressed column to store the length of the data in the column.

18. Data compression (SQL 2008) Row Compression 13

20. Dictionary compression looks for exact value matches across all columns and rows on each page. 14 14

21. Data compression (SQL 2008) PAGE Compression Prefix Compression Dictionary Compression 15

22. Data compression (SQL 2008) Performance 16

23. Data compression (SQL 2008) Performance 17

25. Reduces storage needs significantly

28. UniCode data type  NonUnicode

29. Datetime  SmallDateTime

30. Datetime  Date

31. Datetime  Time20

32. Partitioning Definition: Breakup a table or index into smaller parts, that when stitched recreate the original object. Types of Partitioning: Horizontal Vertical 21

34. There is no data overlap between the partitions.

35. A logical union of partitions recreates the original logical table.22

36. Horizontal Partitioning

37. Horizontal Partitioning Slow storage Medium speed storage Fast storage 24

39. Partitioned Indexes

41. The optimizer must consider each partition separately and duplicate the query's filter against the view for all partitions in the plan

42. Limits on update or delete operations 26

44. One index

45. One PartitionFunction

50. Logical Compression Methods Covering Indexes Filtered Indexes Sparse Columns Refactoring TSQL to retrieve less data

51. When it comes to data Smaller is Better !! 33