Contents
Where is the spatial index on a table?
Once data has been loaded into the spatial tables through either bulk or transactional loading, a spatial index (that is, a spatial R-tree index) must be created on each geometry column in the tables for efficient access to the data.
How to create an index on a geometry type column?
When creating an index on a geometry type column, you must specify the (X-min,Y-min) and (X-max,Y-max) coordinates of the bounding box. For an index on a geography type column, the bounding-box fields become read-only after you specify the Geography grid tessellation scheme, because geography grid tessellation does not use a bounding box.
How do I add a spatial column to a table?
To specify the spatial column that you want to index, click Add. In the Select Columns from dialog box, select a column of type geometry or geography by selecting the corresponding check box. Any other spatial columns then become uneditable.
How do I create an index in SQL Server?
In Object Explorer, connect to an instance of the SQL Server Database Engine and then expand that instance. Expand Databases, expand the database that contains the table with the specified index, and then expand Tables. Expand the table for which you want to create the index. Right-click Indexes and select New Index.
When to delete a spatial index in Oracle?
If the index creation does not complete for any reason, the index is invalid and must be deleted with the DROP INDEX [FORCE] statement. Within each geometry column to be indexed, all the geometries must have the same SDO_SRID value. Spatial indexes can be built on two, three, or four dimensions of data.
How often do spatial indexes need to be regenerated?
To maintain the spatial filter performance, the RTree indexes have to be regenerated on a regular basis. How often this is necessary depends on the amount of editing that takes place. There is no good rule of thumb here. Most sites regenerate the spatial indexes every weekend, which is usually sufficient.
When do you need a spatial R-tree index?
Once data has been loaded into the spatial tables through either bulk or transactional loading, a spatial index (that is, a spatial R-tree index) must be created on each geometry column in the tables for efficient access to the data. The structures of a spatial layer are used to resolve spatial queries and spatial joins.