Re: Cluster and Vacuum Full

Le lun. 5 oct. 2020 à 12:22, PegoraroF10 <marcos(at)f10(dot)com(dot)br> a écrit :

> I have tables which are Master Detail and usually my program loads all
> detail
> records of a master record. So I configured CLUSTER on all those detail
> tables to use an index which is the relation with master table. With that I
> can load less records to Shared Buffers because all detaild records are on
> sequencial pages, that´s fine.
>
> I know that to have this working I have to periodically run CLUSTER, ok
> too.
>
> But today instead of CLUSTER I just ran VACUUM FULL. How vacuum full
> recreates entirelly that table, like cluster does, I thought it would use
> that index too, but didn´t. I didn´t see what sequence of records it did
> but
> was not the one I´ve configured with cluster.
>
> Is that expected or Vacuum should obbey cluster configuration ?
>
>
Only CLUSTER obeys cluster configuration. VACUUM FULL in particular doesn't.

--
Guillaume.