You want to understand why row count statistics shown in your dashboard or via
pg:info don't match the numbers you get by querying your database directly.
Do not be alarmed if the row count you see in your dashboard or
pg:info differ slightly from direct count queries.
To limit impact on your database we use the statistics provided by the catalog table
pg_class, you can learn more here. To increase response time we also aggressively cache these metrics.