Using 8.4.1. How can I

1) Get the transaction id of the oldest serializable transaction and the next transaction?

2) A  list of all active transactions

I have searched the docs and tried Google but I must not be using the right terminology.

Also, am I correct in assuming that vacuuming is not blocked by a long running read committed transaction but only by the oldest serializable transaction?

Any references to relevant documentation would be appreciated.

Bill

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