19 lines
1.4 KiB
Plaintext
19 lines
1.4 KiB
Plaintext
Both the pgsimple and pgsnapshot schemas are PostgreSQL schemas utilising postgis extensions that are capable of storing snapshots of OSM data.
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No history is maintained.
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They can be populated by osmosis and kept up to date with osmosis daily, hourly and minute changesets.
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The pgsimple and pgsnapshot schemas are forked versions of the same schema.
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Up to version 5 of the schema they were known as the "simple" schema.
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The pgsimple schema is the "simple" schema and is unchanged.
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Since version 6, the pgsnapshot schema has deviated to include all tag information in hstore "tags" columns inside the parent entity tables.
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The purpose of the pgsimple schema is to provide a simplistic and generic schema for storing OSM data in a PostGIS format.
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The purpose of the pgsnapshot schema is similar but maximises performance through CLUSTERed indexes and embedded tag data. It imposes additional programming complexity.
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The following scripts are available for both schemas:
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pgxxx_schema_0.x.sql - The schema creation script.
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pgxxx_schema_0.x_bbox.sql - A script for adding way bbox column support.
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pgxxx_schema_0.x_linestring.sql - A script for adding way linestring column support.
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pgxxx_schema_0.x_action.sql - A script for adding an action table which is populated during changeset processing to allow derivative tables to be kept up to date.
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pgxxx_load_0.x.sql - A script for importing PostgreSQL "COPY" files as produced by the osmosis --write-pgxxx-dump tasks.
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