I'm Oracle Dba and want to learn Postgresql. Does it have equivalent of flashback in Postgresql?
In short, no. Here's a good answer: https://dba.stackexchange.com/a/362/30035
And ATM the best practice as Laurenz suggests here: https://www.postgresql.org/message-id/A737B7A37273E048B164557ADEF4A58B36614938%40ntex2010i.host.magwien.gv.at
the lagging slave can show you the value some time ago (look recovery_min_apply_delay
, or pg_xlog_replay_pause()
fro pre 9.4 releases) - of course it's not a FRA, but can give you some place to move