migration guide: idx_placex_geometry_reverse_lookupPoint can be dropped

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

diff --git a/docs/admin/Migration.md b/docs/admin/Migration.md
index 917d37859d1a7e7bdb0a7ee142343df988536b92..b731c37c51075600788462e233645c0a48cdc8d2 100644 (file)
--- a/docs/admin/Migration.md
+++ b/docs/admin/Migration.md
@@ -24,6 +24,13 @@ You can then drop the old index with:
 DROP INDEX idx_placex_pendingsector
 ```
 
+### Unused index
+
+This index has been unused ever since the query using it was changed two years ago. Saves about 12GB on a planet installation.
+
+```sql
+DROP INDEX idx_placex_geometry_reverse_lookupPoint
+```
 
 ### Switching to dotenv