Message-ID: <8bd0f6cd-cbfc-2033-431c-d4ac613c1878@inoc.net>
Date: Tue, 2 Aug 2022 12:09:58 -0400
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Subject: Re: PgSQL 14 - Logical Rep - Single table multiple publications?
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To: Rory Campbell-Lange <rory@campbell-lange.net>
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 <Yuk7YwXqd2ETishS@campbell-lange.net>
Cc: pgsql-performance@postgresql.org
From: Robert Blayzor <rblayzor.bulk@inoc.net>
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On 8/2/22 10:57, Rory Campbell-Lange wrote:
> Special care must be taken with the "replica identity" of published
> tables, as set out at
> https://www.postgresql.org/docs/current/logical-replication-publication.html.
> For example, you may need a unique identifying column for each source
> table in addition to the normal row identifier to differentiate*this*
> table's id 1 row from the*other*  table's id 1 row, otherwise the
> subscriber won't be able to identify the row to delete if this table's
> id 1 row is deleted (for example).
> 
> Although this seems to work fine with native replication, the pglogical
> extension has more knobs. For instance, the
> pglogical.wait_for_subscription_sync_complete function is useful to ensure that
> sync finishes when part of a migration.


We would literally just be merging bulk data rows that are considered 
immutable, meaning they would never be updated or deleted. We would 
replicate only inserts, not deletes, updates, etc.

Would the table identifier still be required in this case?


We have a half a dozen DB's that just collect call records, they are in 
different locations. They get their local call data and store it into 
their local table. We would want to aggregate all that data in a central 
subscription database table for pure analytics/reporting purposes...

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