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Sample Data are stored in a relational database.
A perl script is run to retrieve events located in a region defined by ra_max, dec_max, ra_min,dec_min. (typically 2x2 degrees).
The time spent by the query as well as the number of events found are kept.
The query is launched 100 times, statistics are output.

See the DataDocs page.

Posgresql

Postgresql, since a long time, has implemented geospatial features.

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