prepare for 3.4.0 release

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

diff --git a/docs/admin/Migration.md b/docs/admin/Migration.md
index 0cfe29601fe1abeee03a1ac0bb34329353902e60..f3668357fd1ffa36b5f595710f4e53d781bb1526 100644 (file)
--- a/docs/admin/Migration.md
+++ b/docs/admin/Migration.md
@@ -3,9 +3,25 @@
 This page describes database migrations necessary to update existing databases
 to newer versions of Nominatim.
 
-SQL statements should be executed from the postgres commandline. Execute
+SQL statements should be executed from the PostgreSQL commandline. Execute
 `psql nominatim` to enter command line mode.
 
+## 3.3.0 -> 3.4.0
+
+### Reorganisation of location_area_country table
+
+The table `location_area_country` has been optimized. You need to switch to the
+new format when you run updates. While updates are disabled, run the following
+SQL commands:
+
+```sql
+CREATE TABLE location_area_country_new AS
+  SELECT place_id, country_code, geometry FROM location_area_country;
+DROP TABLE location_area_country;
+ALTER TABLE location_area_country_new RENAME TO location_area_country;
+CREATE INDEX idx_location_area_country_geometry ON location_area_country USING GIST (geometry);
+CREATE INDEX idx_location_area_country_place_id ON location_area_country USING BTREE (place_id);
+```
 
 ## 3.2.0 -> 3.3.0