From: Sarah Hoffmann <lonvia@denofr.de>
Date: Tue, 18 Aug 2020 19:40:53 +0000 (+0200)
Subject: add migration for new indxing schema
X-Git-Tag: v3.6.0~89^2~1
X-Git-Url: https://git.openstreetmap.org./nominatim.git/commitdiff_plain/984979d9bf448cf8dfab9be763c5e0ba6cf2f399

add migration for new indxing schema
---

diff --git a/docs/admin/Migration.md b/docs/admin/Migration.md
index 0400ed43..917d3785 100644
--- a/docs/admin/Migration.md
+++ b/docs/admin/Migration.md
@@ -8,6 +8,23 @@ SQL statements should be executed from the PostgreSQL commandline. Execute
 
 ## 3.5.0 -> master
 
+### Change order during indexing
+
+When reindexing places during updates, there is now a different order used
+which needs a different database index. Create it with the following SQL command:
+
+```sql
+CREATE INDEX idx_placex_pendingsector_rank_address
+  ON placex USING BTREE (rank_address, geometry_sector) where indexed_status > 0;
+```
+
+You can then drop the old index with:
+
+```sql
+DROP INDEX idx_placex_pendingsector
+```
+
+
 ### Switching to dotenv
 
 As part of the work changing the configuration format, the configuration for