docs: rewrite functions when migrating

[nominatim.git] / docs / admin / Migration.md

diff --git a/docs/admin/Migration.md b/docs/admin/Migration.md
index 2f03c200a1acfc21b17815f0f81afd86a99cd288..012c58b328eff4064ccff1e72b63c43b83952461 100644 (file)
--- a/docs/admin/Migration.md
+++ b/docs/admin/Migration.md
@@ -1,5 +1,4 @@
-Database Migrations
-===================
+# Database Migrations

 
 This page describes database migrations necessary to update existing databases
 to newer versions of Nominatim.
 
 This page describes database migrations necessary to update existing databases
 to newer versions of Nominatim.


@@ -7,7 +6,52 @@ to newer versions of Nominatim.
 SQL statements should be executed from the postgres commandline. Execute
 `psql nominiatim` to enter command line mode.
 
 SQL statements should be executed from the postgres commandline. Execute
 `psql nominiatim` to enter command line mode.
 

-# 3.0.0 -> 3.1.0
+## 3.1.0 -> 3.2.0
+
+### New reverse algorithm
+
+The reverse algorithm has changed and requires new indexes. Run the following
+SQL statements to create the indexes:
+
+```
+CREATE INDEX idx_placex_geometry_reverse_lookupPoint
+  ON placex USING gist (geometry)
+  WHERE (name is not null or housenumber is not null or rank_address between 26 and 27)
+    AND class not in ('railway','tunnel','bridge','man_made')
+    AND rank_address >= 26 AND indexed_status = 0 AND linked_place_id is null;
+CREATE INDEX idx_placex_geometry_reverse_lookupPolygon
+  ON placex USING gist (geometry)
+  WHERE St_GeometryType(geometry) in ('ST_Polygon', 'ST_MultiPolygon')
+    AND rank_address between 4 and 25 AND type != 'postcode'
+    AND name is not null AND indexed_status = 0 AND linked_place_id is null;
+CREATE INDEX idx_placex_geometry_reverse_placeNode
+  ON placex USING gist (geometry)
+  WHERE osm_type = 'N' AND rank_search between 5 and 25
+    AND class = 'place' AND type != 'postcode'
+    AND name is not null AND indexed_status = 0 AND linked_place_id is null;
+```
+
+You also need to grant the website user access to the `country_osm_grid` table:
+
+```
+GRANT SELECT ON table country_osm_grid to "www-user";
+```
+
+Replace the `www-user` with the user name of your website server if necessary.
+
+You can now drop the unused indexes:
+
+```
+DROP INDEX idx_placex_reverse_geometry;
+```
+
+Finally, update all SQL functions:
+
+```sh
+./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
+```
+
+## 3.0.0 -> 3.1.0

 
 ### Postcode Table
 
 
 ### Postcode Table
 


@@ -26,6 +70,17 @@ CREATE INDEX idx_postcode_geometry ON location_postcode USING GIST (geometry);
 CREATE UNIQUE INDEX idx_postcode_id ON location_postcode USING BTREE (place_id);
 CREATE INDEX idx_postcode_postcode ON location_postcode USING BTREE (postcode);
 GRANT SELECT ON location_postcode TO "www-data";
 CREATE UNIQUE INDEX idx_postcode_id ON location_postcode USING BTREE (place_id);
 CREATE INDEX idx_postcode_postcode ON location_postcode USING BTREE (postcode);
 GRANT SELECT ON location_postcode TO "www-data";

+drop type if exists nearfeaturecentr cascade;
+create type nearfeaturecentr as (
+  place_id BIGINT,
+  keywords int[],
+  rank_address smallint,
+  rank_search smallint,
+  distance float,
+  isguess boolean,
+  postcode TEXT,
+  centroid GEOMETRY
+);

 ```
 
 Add postcode column to `location_area` tables with SQL statement:
 ```
 
 Add postcode column to `location_area` tables with SQL statement: