Hi David, You catched my word "revert". Thats so encouraging to see how this community helps. Your answer has cleared my 99% doubt. Thanks again. I wish I also contribute one day . Have a good time!
Does PITR recreate database internally ? can i say it is not the same as pg_restore or it is same as pg_restore plus applying WAL on top of it. I am asking because can we revern DDL operations without PITR in streaming replication
PostgreSQL doesn’t have a concept of “revert”.
PITR just deals with raw bytes on disk for an entire cluster. If a new file appears in the WAL that file is created. That file can be a directory for a database.
You cannot mix physical and logical images of the database so applying WAL on top of pg_restore is technically invalid - but it does effective convey the idea. It’s like saying pg_dump and pg_basebackup are similar. Sure, in some ways that is true - but the logical vs. physical distinction cannot be ignored fully.
