How to Create Spatial and Attribute Indexes in PostGIS with QGIS | 20 |
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Welcome back to our ongoing series on Learning Spatial Databases. In this episode, we delve into an essential topic – creating special indexes.
In general, not many people have a clear idea about special indexes, and often, they don't consider them important when working with simple data. However, special indexes can significantly speed up queries on your data. For example, if you don't use special indexes, your database may randomly store records according to the data structure. When you search, it performs sequential scans, consuming a lot of time. On the other hand, special indexes efficiently organize your data, making your searches faster.
Chapters:
0:00:32 - Introduction to Special Indexes
0:01:45 - Comparing Query Costs
0:03:02 - Understanding Indexing Methods
0:03:45 - Rearranging Geometries
0:04:24 - Applying Indexing on Attributes
0:05:00 - Step-by-Step Index Creation
-------------------- queries ----------------------
create unique index inx_and_gid on tbl_fields(gid);
create index indx_and_geom on tbl_fields using GIST(geom);
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#index #Geometry #Geography #PostGIS #PostgrwSQL #QGIS
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19) Step-by-Step: Create Spatial Tables & Add Geometry Columns in PostGIS with QGIS
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-----Searching Topics:------
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Create spatial table,
Spatial indexes for OSM in PostGIS,
Spatial Indexing in PostGIS | Vacuuming and Analyzing,
Optimising Spatial Data Analysis With PostgreSQL And PostGIS,
Geospatial Indexes,
Spatial Database Tips for PostGIS, Oracle, & SQL Server,
Spatial and non spatial indexes and SQL - Spatial SQL with PostGIS,
Understanding the ArcSDE Spatial Index,
What is Spatial Data - An Introduction to Spatial Data and its Applications,
Understanding the ArcSDE Spatial Index,
SQL Spatial,
Spatial indexing with Quadtrees in HINDI,
Write a Shapefile spatial index,
Introduction to spatial queries ,
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