Automated way to find actual COMMIT LSN of subxact LSN - Mailing list pgsql-hackers

From Jeremy Finzel
Subject Automated way to find actual COMMIT LSN of subxact LSN
Date
Msg-id CAMa1XUjZyq9sf1COSL-VPe9khpdu52WUoeWECUQDthGwtmb3vQ@mail.gmail.com
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Responses Re: Automated way to find actual COMMIT LSN of subxact LSN
List pgsql-hackers
I want to build automation to recover a database to a specific LSN *inclusive*, even if that LSN is from a subtransaction.  The problem I am facing is that I know what specific LSN wrote a row on a remote system, but if I create a recovery.conf file with:

recovery_target_lsn = '95F/BBA36DF8'

and 95F/BBA36DF8 is actually a subtransaction, then even if I use default behavior of recovery_target_inclusive = true, that transaction will NOT be included in the restore point, because it is prior to the actual COMMIT LSN of which this lsn/subxact is a part.

My hack for now is to simply manually scan down until I find the COMMIT, which is the only way so far I can figure to find it out.  I don't want to hack some kind of search script based on this if there is already a better way to get this information... anyone know of a way?

Thank you,
Jeremy

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