make code work with Spatialite 4.3

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

diff --git a/docs/admin/Maintenance.md b/docs/admin/Maintenance.md
index 782b377cceb6c30584d6d8ca3b5a86074fe04d52..325e6f8f22410f3d1c96ccb8b5ea7d1cb26a1ca0 100644 (file)
--- a/docs/admin/Maintenance.md
+++ b/docs/admin/Maintenance.md
@@ -34,18 +34,39 @@ to rerun the statistics computation when adding larger amounts of new data,
 for example, when adding an additional country via `nominatim add-data`.
 
 
 for example, when adding an additional country via `nominatim add-data`.
 
 

+## Forcing recomputation of places and areas
+
+Command: `nominatim refresh --data-object [NWR]<id> --data-area [NWR]<id>`
+
+When running replication updates, Nominatim tries to recompute the search
+and address information for all places that are affected by a change. But it
+needs to restrict the total number of changes to make sure it can keep up
+with the minutely updates. Therefore it will refrain from propagating changes
+that affect a lot of objects.
+
+The administrator may force an update of places in the database.
+`nominatim refresh --data-object` invalidates a single OSM object.
+`nominatim refresh --data-area` invalidates an OSM object and all dependent
+objects. That are usually the places that inside its area or around the
+center of the object. Both commands expect the OSM object as an argument
+of the form OSM type + OSM id. The type must be `N` (node), `W` (way) or
+`R` (relation).
+
+After invalidating the object, indexing must be run again. If continuous
+update are running in the background, the objects will be recomputed together
+with the next round of updates. Otherwise you need to run `nominatim index`
+to finish the recomputation.
+
+

 ## Removing large deleted objects
 
 ## Removing large deleted objects
 

+Command: `nominatim admin --clean-deleted <PostgreSQL Time Interval>`
+

 Nominatim refuses to delete very large areas because often these deletions are
 accidental and are reverted within hours. Instead the deletions are logged in
 the `import_polygon_delete` table and left to the administrator to clean up.
 
 Nominatim refuses to delete very large areas because often these deletions are
 accidental and are reverted within hours. Instead the deletions are logged in
 the `import_polygon_delete` table and left to the administrator to clean up.
 

-There is currently no command to do that. You can use the following SQL
-query to force a deletion on all objects that have been deleted more than
-a certain timespan ago (here: 1 month):
+To run this command you will need to pass a PostgreSQL time interval. For example to 
+delete any objects that have been deleted more than a month ago you would run:
+`nominatim admin --clean-deleted '1 month'`

 
 

-```sql
-SELECT place_force_delete(p.place_id) FROM import_polygon_delete d, placex p
-WHERE p.osm_type = d.osm_type and p.osm_id = d.osm_id
-      and age(p.indexed_date) > '1 month'::interval
-```