Sorry, I think there's a misunderstanding here. Our system is not doing near that number of transactions per second. I meant that the duration of a single DB-wide vacuum takes on the order of a couple of weeks. The time between DB-wide vacuums is a little over a year, I believe.
Every couple of weeks implies a transaction rate of ~~500tps, so I'd be
interested to hear more about your system.
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Simon Riggs
EnterpriseDB http://www.enterprisedb.com