virtual techdays INDIA │ august 2010 Developing with SQL Server Spatial & Deep Dive into Spatial Indexing Pinal Dave │ Mentor, Solid Quality Mentors │ SQLAuthority.com

 Yes  No  May Be  I Don’t know! virtual techdays INDIA │ august 2010 Question to You! Is the Earth Flat?

virtual techdays INDIA │ august 2010 The Earth is Flat…

virtual techdays INDIA │ august 2010 The Earth is Flat…

virtual techdays INDIA │ august 2010 The Earth is Flat…

virtual techdays INDIA │ august 2010 …but the Earth is Sphere (almost)!

 Introduction to Spatial Database  One line definition  Planer vs Geographic  Understanding Spatial Indexing  Planer vs Geographic  Index Internals  Query Hinting  Index Maintenance  Performance Troubleshooting virtual techdays INDIA │ august 2010 Agenda Session Objectives And Key Takeaways

 SQL Server MVP  Mentor – Solid Quality Mentors India  Founder – SQLAuthority.com  Regional Mentor – Professional Association for SQL Server (PASS) Asia, Pacific & Middle East  User Group Lead – Ahmedabad SQL Server UG, Gandhinagar SQL Server UG  Author, Trainer, Speaker, Consultant  MCT, MCTS, MCP, MCDBA, MCAD   virtual techdays INDIA │ august 2010 Agenda Session Objectives And Key Takeaways

 spa·tial [spey-shuhl] –adjective 1.of or pertaining to space. 2.existing or occurring in space. 3.having extension in space.  Database that models space, objects in space, or a combination of both and provide capabilities to store and manipulate spatial data virtual techdays INDIA │ august 2010 What is Spatial? One Line Definition

 GEOMETRY data type  Infinite X and Y virtual techdays INDIA │ august 2010 SQL Server 2008 Systems Story Planar Systems  GEOGRAPHY data type  Latitude -90 to +90  Longitude 0 to 360 Geographic Systems

virtual techdays INDIA │ august 2010 DEMO: Various Datatypes DEMO: World Map

 Requires bounding box  Only one grid virtual techdays INDIA │ august 2010 SQL Server 2008 Indexing Story Planar Index  No bounding box  Two top-level projection grids Geographic Index

 4 levels  Customizable grid granularity  Three Grid Densities Per Level - Low, Medium, High  Customizable max number of cells per object virtual techdays INDIA │ august 2010 SQL Server 2008 Indexing Story Multi-Level Grid

virtual techdays INDIA │ august 2010 MAIN SLIDE TITLE Sub Slide Title / (“cell 0”) /4/2/3/1

virtual techdays INDIA │ august 2010 Tessellation Process

Create index example GEOMETRY: CREATE SPATIAL INDEX sixd ON spatial_table(geom_column) WITH ( BOUNDING_BOX = (0, 0, 500, 500), GRIDS = (LOW, LOW, MEDIUM, HIGH), CELLS_PER_OBJECT = 20) Create index example GEOGRAPHY: CREATE SPATIAL INDEX sixd ON spatial_table(geogr_column) WITH ( GRIDS = (LOW, LOW, MEDIUM, HIGH), CELLS_PER_OBJECT = 20) Use ALTER and DROP INDEX for maintenance. virtual techdays INDIA │ august 2010 Index Creation and Maintenance

virtual techdays INDIA │ august 2010 DEMO: Geometry Index DEMO: Index Analysis

 FROM T WITH (INDEX ( ))  Spatial index is treated the same way a non-clustered index is  the order of the hint is reflected in the order of the indexes in the plan  multiple index hints are concatenated  no duplicates are allowed  The following restrictions exist:  The spatial index must be either first in the first index hint or last in the last index hint for a given table.  Only one spatial index can be specified in any index hint for a given table. virtual techdays INDIA │ august 2010 Index Hints

 Make sure you are running SQL Server 2008 SP1  Check query plan for use of index  Make sure it is a supported operation  Hint the index (and/or a different join type)  Do not use a spatial index when there is a highly selective non-spatial predicate virtual techdays INDIA │ august 2010 Checklist for Performance

virtual techdays INDIA │ august 2010 RESOURCES  Michael Rys   Pinal Dave 

virtual techdays THANKS │ august 2010 │