PG Bug reporting form <noreply@postgresql.org> writes:
> In active/hot standby mod, doing likes the following：
> 1) using createdb to create a database 'test'
> 2) drop template0 and template1 database
Removing the template0 database is not a supported configuration.
There are emergency situations where it could make sense to do it,
perhaps, but only if you then recreate it (using some other database
as template); and even then you'd better be a guru who knows exactly
what he's doing, or you'll mess up the installation beyond repair.
It's certainly no surprise that dump/restore type activities will
fail with no template for CREATE DATABASE to source from.
> Is this a Bug?
No, it's Pilot Error.
regards, tom lane
