From: Sarah Hoffmann <lonvia@denofr.de>
Date: Sun, 11 Oct 2020 08:40:23 +0000 (+0200)
Subject: docs: migration to new wikipedia needs new index
X-Git-Tag: v3.6.0~54^2
X-Git-Url: https://git.openstreetmap.org./nominatim.git/commitdiff_plain/3b23144ae68b27c643f40fd186b40bf3c8a900c3

docs: migration to new wikipedia needs new index

Fixes #1998.
---

diff --git a/docs/admin/Migration.md b/docs/admin/Migration.md
index b731c37c..fb766ba6 100644
--- a/docs/admin/Migration.md
+++ b/docs/admin/Migration.md
@@ -53,6 +53,12 @@ follows:
   * download the new Wikipedia tables as described in the import section
   * reimport the tables: `./utils/setup.php --import-wikipedia-articles`
   * update the functions: `./utils/setup.php --create-functions --enable-diff-updates`
+  * create a new lookup index:
+```
+CREATE INDEX idx_placex_wikidata on placex
+USING BTREE ((extratags -> 'wikidata'))
+WHERE extratags ? 'wikidata' and class = 'place' and osm_type = 'N' and rank_search < 26
+```
   * compute importance: `./utils/update.php --recompute-importance`
 
 The last step takes about 10 hours on the full planet.