Hi Matt, Hi Frederik, Following your respective talks at SOTM, we (MapOSMatic) have a question regarding the growth of the on-disk size of the OSM world database.
We've done an initial import of this database in ~october 2009, and since then, we've used daily diffs to keep this database up to date. As of today, our PostgreSQL database takes 174 GB. However, during a discussion at SOTM, Frederik told us that the size of the world database resulting from a brand-new import would only be 120-130 GB. This seems to mean that using the daily diffs does not produce the same result as making a full import of the database. Is this true ? Matt, during our talk, you answered a question from the audience asking whether using minutely diffs over a long period of time would not be a problem compared to doing regular full imports of the database. Is there a major difference in how minutely diffs and daily diffs are handled that would explain why using daily diffs over a long period of time does not work and why it would work with minutely diffs ? Thanks for your insights, Thomas, for the MapOSMatic team -- Thomas Petazzoni http://thomas.enix.org MapOSMatic http://www.maposmatic.org
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