Jennifer Spencer <jenniferm411@hotmail.com> wrote:
> Hm - Kevin, when you issue CLUSTER on your table, when do you switch
> the users over and do you let them keep writing during the process?
> Or is the second copy table read-only to the users while the
> cluster-build is happening on the primary (making it unavailable)?
> Thanks - and thanks for the Sybase difference explanation.
We only use CLUSTER occassionally, to recover from bloat caused by
exceptional circumstances (like mass deletes or a long-running
transaction from some will-behaved programmer.). CLUSTER has to lock
the table for the duration, blocking other users. We schedule this
off-hours.
I'm glad the info was useful. Our move from Sybase was incredibly
smooth, due largely to help from these PostgreSQL lists; I figure I
owe it to the community to give back as I am able. :-)
-Kevin