[Tile-serving] [openstreetmap/osm2pgsql] Segmentation Fault during Nominatim daily update (#1014)

[Sarah Hoffmann]

I'd expect a slowdown because deletes are now done sequentially with the data insertion to avoid deadlocks. Before the deletes where done in a different thread via a different connection. I've down a quick measurement with a daily diff. Interestingly, I see quite a significant slowdown when fsync and synchronous commits are off but none when running postgres with fsync. I'll check nonetheless if there is room for optimization of the deletes.

Segfault is solved with #1018, so closing here.

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