On Sun, 2023-03-12 at 01:53 +0530, Atul Kumar wrote: > Could someone help me in telling the difference between these three parameters > 1. max_standby_archive_delay > 2. max_standby_streaming_delay > 3. recovery_min_apply_delay > > My basic motive is to make the standby database server to be delayed to apply the > changes on itself, if any data has been accidentally deleted/updated/ truncated > from the primary server. > > Which parameter do I need to configure to serve this purpose ? And > When will the remaining two parameters be used ? > > It would be great if anyone can explain them with a brief example. The parameter that does what you describe you want is "recovery_min_apply_delay". The other parameters only deal with delaying replication in the face of a replication conflict. Note that changes are immediately shipped to the standby, what is delayed with "recovery_min_apply_delay" is only the replay of the WAL information. So you can recover from a logical problem like DROP TABLE by stopping the standby, setting "recovery_target_time" to a time before the problem happened and then restarting the standby. Then recovery will stop before the problem is replayed. Yours, Laurenz Albe
