From ff9ffa03513c89676e186d145d72e779d74bc696 Mon Sep 17 00:00:00 2001
From: Sarah Hoffmann <lonvia@denofr.de>
Date: Sun, 11 Oct 2020 10:40:23 +0200
Subject: [PATCH] docs: migration to new wikipedia needs new index

Fixes #1998.
---
 docs/admin/Migration.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/docs/admin/Migration.md b/docs/admin/Migration.md
index c7d3fe18..a28b07e2 100644
--- a/docs/admin/Migration.md
+++ b/docs/admin/Migration.md
@@ -17,6 +17,12 @@ 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.