Creating spatial indexes on tables with an ST_Geometry column

When you create a spatial index, you need to provide the following information:

• A name
• The name of the spatial column on which the index is to be defined
• The grid sizes (only necessary for databases that use a grid index, such as Oracle or DB2)

The following are examples of creating a spatial index on an ST_Geometry column in each of the supported databases.

Steps:

1. • Oracle

     CREATE INDEX sa_idx ON sensitive_areas(zone)
     INDEXTYPE IS sde.st_spatial_index
     PARAMETERS('st_grids=1,3,0 st_srid=1');
     
     CREATE INDEX hs_idx ON hazardous_sites(location)
     INDEXTYPE IS sde.st_spatial_index
     PARAMETERS('st_grids=1,0,0 st_srid=1');

   • DB2

     CREATE INDEX sa_idx ON sensitive_areas(zone) 
     EXTEND USING db2gse.spatial_index (1.0, 3.0, 0.0)
     
     CREATE INDEX hs_idx ON hazardous_sites(location) 
     EXTEND USING db2gse.spatial_index (1.0, 0.0, 0.0)

   • PostgreSQL

     CREATE INDEX sa_idx ON sensitive_areas 
     USING gist(zone st_geometry_ops);
     
     CREATE INDEX sa_idx ON hazardous_sites
     USING gist(location st_geometry_ops);

   • Informix

     CREATE INDEX sa_ix
     ON sensitive_areas (zone ST_Geometry_ops)
     USING RTREE;
     
     CREATE INDEX hs_ix
     ON hazardous_sites (location ST_Geometry_ops)
     USING RTREE;