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add warning for reverse index migration

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Sarah Hoffmann 2023-02-18 09:43:37 +01:00
parent 89d47d26f0
commit dd5cd97713
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docs/admin/Migration.md
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@ -15,6 +15,25 @@ breaking changes. **Please read them before running the migration.**
If you are migrating from a version <3.6, then you still have to follow
the manual migration steps up to 3.6.
## 4.1.0 -> master
### New indexes for reverse lookup
The reverse lookup algorithm has changed slightly to improve performance.
This change needs a different index in the database. The required index
will be automatically build during migration. Until the new index is available
performance of the /reverse endpoint is significantly reduced. You should
therefore either remove traffic from the machine before attempting a
version update or create the index manually **before** starting the update
using the following SQL:
```
CREATE INDEX IF NOT EXISTS idx_placex_geometry_reverse_lookupPlaceNode
ON placex USING gist (ST_Buffer(geometry, reverse_place_diameter(rank_search)))
WHERE rank_address between 4 and 25 AND type != 'postcode'
AND name is not null AND linked_place_id is null AND osm_type = 'N';
```
## 4.0.0 -> 4.1.0
### ICU tokenizer is the new default