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From: David G. Johnston <[email protected]>
To: pgsql-novice <[email protected]>
Subject: Re: restore overwrite?
Date: Wed, 7 Sep 2022 09:31:11 -0700
Message-ID: <CAKFQuwZkmTAv-7_3cof5phaMqhfdTnWHVs+v-LssN=iF6O1QOA@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On Wednesday, September 7, 2022, Anne Wainwright <[email protected]>
wrote:

> Hi,
>
> I want to do a restore to write over the top of existing data.
>
> The unique key prevents this. Should I rather TRUNCATE the tables
> concerned before the restore? That is a bit scary if the restore does
> not work. Is there a better way.
>
> (This data on v.8.4.4 which is being moved to latest version 14).
>
> Thanks for answer in advance
>
> Anne
>
>
If you cannot just do a simple restore into an empty v14 database you are
probably better off not thinking of this as a restore operation but instead
an ETL operation and write ETL code to extract data from the v8 database,
do any necessary transforms (possibly within the v14 database but within a
staging table), then merge the transformed data into the real v14 tables.

David J.

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