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From: Adrian Klaver <[email protected]>
To: Marcelo Fernandes <[email protected]>
Cc: [email protected]
Subject: Re: Best Approach for Swapping a Table with its Copy
Date: Wed, 12 Feb 2025 13:40:25 -0800
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAM2F1VOOn1izCrtcrDx4YUtCY-H64Vj5yvN5H1Lhk8kCY+_W6Q@mail.gmail.com>
References: <CAM2F1VP9nn0F6fSjbmhJCNSjv-dbAJcAytZ2HkTkZ0dGYZvxrw@mail.gmail.com>
	<[email protected]>
	<CAM2F1VOOn1izCrtcrDx4YUtCY-H64Vj5yvN5H1Lhk8kCY+_W6Q@mail.gmail.com>



On 2/12/25 1:27 PM, Marcelo Fernandes wrote:
> On Thu, Feb 13, 2025 at 10:02 AM Adrian Klaver

> This is a simplified version of the original table:
> 
> CREATE TABLE bookings (
>      id SERIAL PRIMARY KEY,
>      resource_id INT NOT NULL,
>      start_date DATE NOT NULL,
>      end_date DATE NOT NULL
> );
> 
>> 3) The exclusion constraint definition.
> 
> The copy table would have an exclusion constraint such as:
> 
> ALTER TABLE bookings
> ADD CONSTRAINT no_date_overlap_for_resource_id
> EXCLUDE USING gist (
>      resource_id WITH =,
>      daterange(start_date, end_date, '[]') WITH &&
> );

Do you know this will not fail on the existing data?

> 
>> 4) Definition of what 'fairly large' is.
> 
> This table is over 400GB

Do you have room for a complete copy of the table?


> 
> This is done to avoid having to hold an exclusive lock for a long amount of
> time, thus creating application outages.

I am not seeing how this can be done without some outage for that table.

What sort of time frame is acceptable?

> 
> Hope that clarifies the situation a bit better
>    - Marcelo

-- 
Adrian Klaver
[email protected]

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