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Data Partitioning – SQL Server Satya

Data Partitioning – SQL Server Satya. Agenda. Data Partitioning in SQL Server Architecture Demo. Data Partitioning. Also known as Horizontal Partitioning Large table/index can be split into multiple manageable portions Advantages Improves Query Performance

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Data Partitioning – SQL Server Satya

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  1. Data Partitioning – SQL Server Satya

  2. Agenda • Data Partitioning in SQL Server • Architecture • Demo

  3. DataPartitioning • Also known as Horizontal Partitioning • Large table/index can be split into multiple manageable portions • Advantages • Improves Query Performance • Better Data Manageability and Cost Effective • Deleting and Moving data is faster from partitions • Narrow downs the index maintenance window • OLTP/DSS – Operational/Non-Operational data

  4. DataPartitioning Architecture Table/Indexed View Logical Representation P1 Pn Index /Heap Index/Heap Data pages Data pages

  5. PartitionConcepts • PARTITION FUNCTION • Used to specify partition boundary values • Two types (represents boundary data directions) • LEFT -myself and my left range values • RIGHT -myself and my right range values • PARTITION SCHEME • Logical & Partitions physically aligned • Span over single or multiple file groups • Can specify each partition can go to a individual file group or all partitions can go into a single file group

  6. Creating Partition Function <=10 <10 >10 & <=50 >=10 & <50 >50 >=50

  7. PartitionPhysical Architecture Database File Group Partition scheme Database File Group A Partition scheme File Group B File Group C File Group D

  8. PartitionConcepts (2) • SPLIT/MERGE • SPLIT • Introduces new boundary • Partition will be added to respective side (L/R) • MERGE • Deletes boundary • Partition will be merged to the respective side (L/R) • SWITCH IN/OUT • Moving partition from partitioned table to other partitioned table called “in” • Moving partition from partitioned table to non partitioned table called “out”

  9. SPLIT – LEFT Boundary <=10 >10 & <=50 >50 >10 & <=25 >25 & <=50 >50 <=10

  10. MERGE – LEFT Boundary >10 & <=25 >25 & <=50 >50 <=10 <=25 >25 & <=50 >50 <=10

  11. SWITCH OUT Partitioned Table Non Partitioned table Partition 1 Partition 2 Partition 1 SWITCH IN/OUT says “Hey, its your partition by updating metadata.” Partitioned Table Non Partitioned table Partition 1 Partition 1

  12. Demo Presentation and Scripts will be mailed you at the end Or Alternatively available on http://satyasql.wordpress.com To become master…

  13. Additional Information • Would not support for composite key • SQL Server 2008 SP2 or Later versions boosted creation of partitions up to 15000

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