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I have a COUNT(*) query in PostgreSQL that runs often, and looks like:
SELECT COUNT(*)
FROM customer
WHERE source_id IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);
This query takes between 30-60 seconds to run and searches millions of records.
EXPLAIN ANALYZE shows it's doin...