|From:||Andres Freund <andres(at)anarazel(dot)de>|
|To:||Georgy Buranov <gburanov(at)gmail(dot)com>|
|Subject:||Re: PostgreSQL logical decoder output plugin - unchanged toast data|
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On 2018-08-31 16:55:37 +0200, Georgy Buranov wrote:
> Ok, thank you very much for your explanation,
> maybe I need something else in my case.
> As far as I understand, "On-disk toasted data for tuples from the WAL
> are not guaranteed in any way to be retain", but still, the LATEST
> value for the same cell should exist in postgres (in on-disk toast if
> it is huge, or not).
No, there's absolutely no such guarantee. The tuple could since have
been deleted, the column could have been updated to non-toasted, the
table could have been dropped, ...
> If I cannot get access to the on-disk toasted data for tuple from the
> WAL, can I have the access to the _latest_ value in this case
> (hopefully I describe it correct)
Again, you can set REPLICA IDENTITY to FULL and it'll be there.
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