On Fri, Jan 22, 2021 at 10:14 AM japin <japi...@hotmail.com> wrote: > > 2) Can't we know whether the publications exist on the publisher with > > the existing (or modifying it a bit if required) query in > > fetch_table_list(), so that we can avoid making another connection to > > the publisher system from the subscriber? > > IIUC, the patch does not make another connection, it just execute a new > query in already connection. If we want to check publication existence > for ALTER SUBSCRIPTION ... SET PUBLICATION ... WITH (refresh = false) > we should make another connection.
Actually, I meant that we can avoid submitting another SQL query to the publisher if we could manage to submit a single query that first checks if a given publication exists in pg_publication and if yes returns the tables associated with it from pg_publication_tables. Can we modify the existing query in fetch_table_list that gets only the table list from pg_publcation_tables to see if the given publication exists in the pg_publication? Yes you are right, if we were to check the existence of publications provided with ALTER SUBSCRIPTION statements, we need to do walrcv_connect, walrcv_exec. We could just call a common function from there. With Regards, Bharath Rupireddy. EnterpriseDB: http://www.enterprisedb.com
