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Message-ID: <a9dd7961-dd3e-406e-a1d8-0feb233fa5e9@aklaver.com>
Date: Wed, 3 Apr 2024 14:11:37 -0700
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Subject: Re: Moving delta data faster
To: yudhi s <learnerdatabase99@gmail.com>,
 pgsql-general <pgsql-general@lists.postgresql.org>
References: <CAEzWdqcYGi0U5_cK1FVykx2-OZHmEUD8EZ_VE=kpoVaZKYWJeg@mail.gmail.com>
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From: Adrian Klaver <adrian.klaver@aklaver.com>
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On 4/3/24 13:38, yudhi s wrote:
>   Hi All,
>   It's postgresql database version 15.4. We have a requirement in which 
> we will be initially moving full table data for 3-4 tables, from source 
> database to target(i.e. postgres) . Maximum number of rows will be 
> ~10million rows in those tables. Then subsequently these rows will be 
> inserted/updated based on the delta number of rows that got 
> inserted/updated in the source database. In some cases these changed 
> data can flow multiple times per day to the downstream i.e. postgres 
> database and in other cases once daily.

What is the source database?

Can it be reached with a FDW?:

https://wiki.postgresql.org/wiki/Foreign_data_wrappers

Can the delta on the source be output as CSV?

> 
>   Want to understand , if we should use upsert(insert on conflict) or 
> merge statements or anything else in such a scenario so as to persist 
> those delta records faster in the target database, while making the 
> system online to the users?
> 
> Regards
> Yudhi

-- 
Adrian Klaver
adrian.klaver@aklaver.com