What Is a Spatial Index?


Stephen Judge
HOME ยป Computers

In database design, an index is a data structure that takes the value of one or more columns, or fields, as input and returns the corresponding records quickly. A spatial index is an index on a column containing spatial data or, in other words, data representing the length, area and volume of lines, surfaces and other objects. Spatial data is often used in computer-aided design, map making and geographic information systems. PurposeSpatial datasets are typically large and irregularly distributed. If a query is performed on a spatial dataset without spatial indexes, every record in the dataset needs to be examined to determine if it matches the search criteria. This type of scan, known as
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Related to : What Is a Spatial Index?
SQL Spatial index and clustered index
Computers

I am creating a spatial index on a geography column in SQL Server Azure Server like below..


CREATE SPATIAL INDEX sp_idx ON TableA(GeographyAreaCode) USING GEOGRAPHY_GRID WITH (GRIDS = (LEVEL_1 = LOW, LEVEL_2 = LOW, LEVEL_3 = HIGH, LEVEL_4 = HIGH), CELLS_PER_OBJECT = 16, DROP_EXISTING = ON)


Now I've observed that two indexes with the given name sp_idx are being created - one spatial and the other as Clustered index..


Does SQL Server create a mandatory clustered index with the spatial index?


Also If I have to delete this index, will it delete the associated Clustered index also?


Many Tha

Using Spatial Index
Computers

I want to learn how to use Spatial Index in SQL SERVER 2012. I have some very time-consuming query so I need it.


I would be very grateful for some example and explanation.


Thanks!


What is a SPATIAL INDEX and when should I use it?
Computers

Like most of the average PHP web developers I use MySql as a RDBMS. MySql (as other RDBMS also) offers SPATIAL INDEX features, but I'm don't get it very well. I have googled for it but didn't find clear real world examples to clarify my bad knowledge about it.


Could someone explain me a little bit what is a SPATIAL INDEX and when should I use it?


What Is a Spatial Index?
Computers

In database design, an index is a data structure that takes the value of one or more columns, or fields, as input and returns the corresponding records quickly. A spatial index is an index on a column containing spatial data or, in other words, data representing the length, area and volume of lines, surfaces and other objects. Spatial data is often used in computer-aided design, map making and geographic information systems. PurposeSpatial datasets are typically large and irregularly distributed. If a query is performed on a spatial dataset without spatial indexes, every record in the dataset needs to be examined to determine if it matches the search criteria. This type of scan, known as


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