Re: Adding Column on Huge Table

My experience is that adding a column is a rather quick operation even
on quite large tables, _unless_ the column has a default value, in which
case that default value is set for every row. In that case, the time
required for the operation converges with that of a mass-UPDATE.

On Tue, Mar 19, 2019 at 09:53:16PM +0100, Andrzej Zawadzki wrote:

> On 19.03.2019 16:56, Moin Akther wrote:
>
> Dear Experts,
>
> We want to add a column on table size of 1.5TB, we have to perform this
> activity with minimal downtime. 
>
> What are the best practises to add a column on huge table ?
>
> How much time alter statement will take to add column ?
>
> Any alternate solution other than alter statement to add column ?
>
> Will adding a new column on a huge table generate huge WAL files ?
>
>
> No offense, but don't you have any test environment?
>
> Try that or maybe you have so show times.
>
>
> --
>
> Andrzej Zawadzki
>

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