I am currently writing an application that needs to be able to select a subset of IDs from Millions of users...
I am currently writing software to select a group of 100.000 IDs from a table that contains the whole list of Brazilian population 200.000.000 (200M), I need to be able to do this in a reasonable amount of time... ID on Table = ID on XML
I am thinking of parsing the xml file and starting a thread that performs a SELECT statement on a database, I would need a connection for each thread, still this way seems like a brute force approach, perhaps there is a more elegant way?
1) what is the best database to do this? 2) what is a reasonable limit to the amount of db connections?