Re: change bigint column to int

I want to do it on a very big tables(100M records). Do you think that it
will be slow ? I mean if I have an AccessExclusiveLock for a lot of time I
cant just run a query and take my time until it finishes..

‫בתאריך יום ה׳, 1 בנוב׳ 2018 ב-13:55 מאת ‪Evan Bauer‬‏ <‪evanbauer(at)mac(dot)com
‬‏>:‬

> Mariel,
>
> Just run a query and make certain that all values currently stored in the
> column fit in 4 bytes (+/- 2,147,483,648) before doing the ALTER.
>
> Cheers,
>
> Evan
>
> Sent from my iPhone
>
> On Nov 1, 2018, at 06:20, Mariel Cherkassky <mariel(dot)cherkassky(at)gmail(dot)com>
> wrote:
>
> Hi,
>
> I want to change the column type from bigint to int to save space. By
> doing so, does it include some risks ? As I see it, I should only run
> vacuum full afterwards if I want to return space to the os right ?
>
>