> Sorry, I could have been clearer - pg_stat_activity is what I'm looking > at - I'm recording connection info from here every 15 seconds (from a > superuser account so I don't get locked out). It never peaks above 300 > (in fact when the incident happens no new connections can come in so it > falls to around 100) - yet I'm seeing the log lines claim that I'm still > hitting 597 (600 - 3 reserved).
What is the query you are using against pg_stat_activity?
For general counts ad-hoc we just use:
SELECT count(*) FROM pg_stat_activity
The monitoring system runs:
SELECT CASE WHEN usename IS NOT NULL THEN usename ELSE 'SYSTEM' END as role,
datname AS database, state, wait_event, count(*) AS connection FROM pg_stat_activity GROUP BY 1,2,3,4
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