Reporter: Nop
[Submitted to the original trac issue database at 11.08pm, Tuesday, 13th January 2009]

When you import several data files with osm2pqsql consecutively and any of them contain ways with identical ids, osm2pqsql fails with the error message:
failed: ERROR: duplicate key violates unique constraint "planet_osm_ways_pkey"

In non-slim mode, the same operation succeeds.

Use case: When you cut multiple sections OSM with osmosis for processing but eventually want everything in the same DB for rendering. Osmosis will duplicate all ways crossing the boundaries.
Same problem occurs when you try to load neighboring plaent files, e.g. two neighboring states.