Got it! Thanks Andres and Tom! Tiff
On Fri, Apr 12, 2019 at 1:07 PM Tom Lane <t...@sss.pgh.pa.us> wrote: > Andres Freund <and...@anarazel.de> writes: > > On 2019-04-12 09:51:51 -0400, Tom Lane wrote: > >> Tiffany Thang <tiffanyth...@gmail.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. > > Right, but in that situation there's no intent to keep both indexes > in place. You're just putting up with extra overhead temporarily > as a means to avoid taking an exclusive lock. > > regards, tom lane >
