Keep your data base up to date

A local OpenStreetMap data base can be kept up to date by way of periodic updates.

Related terms are: * Replication files * Minutely updates

Updates may only be applied to local data bases that were originally populated with the "--slim" option enabled.

Terms

Replication interval

The replication interval limits the number of updates applied to the local data base in one update operation. A replication interval of 1440 includes all of the edits from a 1440 minute (24 hour) period.

An arbitrary replication interval may be selected. Shorter intervals are less efficient due to start-up overhead. Longer intervals are less efficient due to larger file size. As a rule of thumb, consider a replication period of 1440 minutes as a starting point. Replication interval should be longer than update period.

Update period

An arbitrary update period may be selected. Your intended application, available hardware, and other factors will inform your choice. Try every six hours to start as a rule of thumb.

Updating your local data base

  1. Create and populate your local data base, using the "--slim" option
  2. Select a state file prior to the creation time of your planet file
  3. Set replication interval
  4. Initialize replication
  5. Use cron to run replication at your chosen update period

Tools required

  • PostgreSQL
  • PostGIS
  • osm2pgqsl
  • osmosis
  • cron