I have a US zip code look-up table that includes all zip codes within a 300 mile radius.
DATE_PORTAL=# select count(origin) from zips_300 ;
count
-----------
201021979
(1 row)
The row count is shown above. I get great , great performance. However with large data sets, you need a lot of space for indexes. In my production system, I moved the indexes to another disk.
Postgresql can handle 50 million rows with no problem, just index the data properly.
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