Hi,
On 2019-04-12 09:51:51 -0400, Tom Lane wrote:
> Tiffany Thang <tiffanythang(at)gmail(dot)com> writes:
> > Can someone explain the use of creating multiple indexes on the same
> > column?
>
> There is none, unless the indexes have different properties (e.g.
> different opclasses and/or index AMs).
Well, it can be beneficial to create a new index concurrently, and then
drop the old one concurrently. Before v12 that's the only way to
recreate an index during production, if it e.g. bloated.
Greetings,
Andres Freund