add warning about experimental nature of ICU tokenizer

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

diff --git a/docs/admin/Migration.md b/docs/admin/Migration.md
index 333c24778eef2b577b770d822df01c61eac71166..fc309af1c3d9d69a089d40b280bea11dc240a747 100644 (file)
--- a/docs/admin/Migration.md
+++ b/docs/admin/Migration.md
@@ -1,22 +1,32 @@
 # Database Migrations
 
-This page describes database migrations necessary to update existing databases
-to newer versions of Nominatim.
+Since version 3.7.0 Nominatim offers automatic migrations. Please follow
+the following steps:
 
-SQL statements should be executed from the PostgreSQL commandline. Execute
-`psql nominatim` to enter command line mode.
+* stop any updates that are potentially running
+* update Nominatim to the newer version
+* go to your project directory and run `nominatim admin --migrate`
+* (optionally) restart updates
 
-## 3.6.0 -> master
+Below you find additional migrations and hints about other structural and
+breaking changes. **Please read them before running the migration.**
 
-### Status table contains now time zone information
+!!! note
+    If you are migrating from a version <3.6, then you still have to follow
+    the manual migration steps up to 3.6.
 
-The `import_status` table has been changed to include timezone information
-with the time stamp. You need to alter an existing table before running
-any replication functions with:
+## 3.6.0 -> 3.7.0
 
-```sql
-ALTER TABLE import_status ALTER COLUMN lastimportdate TYPE timestamp with time zone;
-```
+### New format and name of configuration file
+
+The configuration for an import is now saved in a `.env` file in the project
+directory. This file follows the dotenv format. For more information, see
+the [installation chapter](Import.md#configuration-setup-in-env).
+
+To migrate to the new system, create a new project directory, add the `.env`
+file and port your custom configuration from `settings/local.php`. Most
+settings are named similar and only have received a `NOMINATIM_` prefix.
+Use the default settings in `settings/env.defaults` as a reference.
 
 ### New location for data files
 
@@ -37,8 +47,8 @@ functionality of each script:
 * ./utils/setup.php: `import`, `freeze`, `refresh`
 * ./utils/update.php: `replication`, `add-data`, `index`, `refresh`
 * ./utils/specialphrases.php: `special-phrases`
-* ./utils/check_import_finished.php: `check-database`
-* ./utils/warm.php: `warm`
+* ./utils/check_import_finished.php: `admin`
+* ./utils/warm.php: `admin`
 * ./utils/export.php: `export`
 
 Try `nominatim <command> --help` for more information about each subcommand.
@@ -46,6 +56,12 @@ Try `nominatim <command> --help` for more information about each subcommand.
 `./utils/query.php` no longer exists in its old form. `nominatim search`
 provides a replacement but returns different output.
 
+### Switch to normalized house numbers
+
+The housenumber column in the placex table uses now normalized version.
+The automatic migration step will convert the column but this may take a
+very long time. It is advisable to take the machine offline while doing that.
+
 ## 3.5.0 -> 3.6.0
 
 ### Change of layout of search_name_* tables
@@ -108,6 +124,14 @@ configuration file, run the following command after updating:
 ./utils/setup.php --setup-website
 ```
 
+### Update SQL code
+
+To update the SQL code to the leatest version run:
+
+```
+./utils/setup.php --create-functions --enable-diff-updates --create-partition-functions
+```
+
 ## 3.4.0 -> 3.5.0
 
 ### New Wikipedia/Wikidata importance tables