[Tile-serving] [openstreetmap/osm2pgsql] How does osm2pgsql --append handles duplicates while updating diff files (Discussion #1974)

[wgds60]

Thank you for your detailed reply. I was actually doing this: 

> It is also useful after the initial import to make sure the data is properly in sync between your initial import source and your source of replication diffs.

One last question regarding:

> You can use the append mode to do a replay of updates.

Is there any performance degradation in replays of updates vs. normal updates? 



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