[Tile-serving] [openstreetmap/osm2pgsql] Database error: ERROR: cannot execute CREATE FUNCTION in a read-only transaction (Discussion #2075)

[Goncalo Oliveira]

Hi,

I'm having issues trying to copy data into a database. This is happening with region europe/great-britain/england, if I use a smaller region, like greater london, I don't have this issue. The copy process seems to run until the end, but somewhere trying to build indexes, I get a read-only transaction error.

```
2023-09-09 12:24:19  osm2pgsql version 1.9.2
2023-09-09 12:24:19  Database version: 15.4
2023-09-09 12:24:19  PostGIS version: 3.2
2023-09-09 12:24:20  Storing properties to table '"public"."osm2pgsql_properties"'.
2023-09-09 12:24:23  Setting up table 'planet_osm_point'
2023-09-09 12:24:23  Setting up table 'planet_osm_line'
2023-09-09 12:24:24  Setting up table 'planet_osm_polygon'
2023-09-09 12:24:25  Setting up table 'planet_osm_roads'
2023-09-09 14:29:38  Reading input files done in 7513s (2h 5m 13s).                       
2023-09-09 14:29:38    Processed 137635681 nodes in 474s (7m 54s) - 290k/s
2023-09-09 14:29:38    Processed 21132737 ways in 1074s (17m 54s) - 20k/s
2023-09-09 14:29:38    Processed 218809 relations in 5965s (1h 39m 25s) - 37/s
2023-09-09 14:29:41  Clustering table 'planet_osm_polygon' by geometry...
2023-09-09 14:29:41  Clustering table 'planet_osm_line' by geometry...
2023-09-09 14:29:41  Clustering table 'planet_osm_point' by geometry...
2023-09-09 14:29:41  Clustering table 'planet_osm_roads' by geometry...
2023-09-09 14:30:36  Done postprocessing on table 'planet_osm_nodes' in 0s
2023-09-09 14:30:37  Building index on table 'planet_osm_rels'
2023-09-09 14:30:37  Building index on table 'planet_osm_ways'
2023-09-09 14:30:37  ERROR: Database error: ERROR:  cannot execute CREATE FUNCTION in a read-only transaction
```

This is a clean database, hosted on Digital Ocean (1 vcpu, 2 GB memory, 30 GB SSD), only initialized with the required extensions. I've retried this process a few times, but it always ends the same way.

The command is being executed as follows

```bash
osm2pgsql --create --slim -C 1000 \
    --hstore-all \
    data.osm.pbf
```

Can anyone provide some assistance?

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