Edmundo: On Wed, Dec 21, 2016 at 11:36 PM, Edmundo Robles <edmundo@sw-argos.com> wrote: > i need disable inheritance from many tables in a query like > "delete from pg_inherits where inhparent=20473" instead alter table ... > but is safe? which is the risk for database if i delete it?
Dangers of touching the catalog directly have already been pointed by TL, along with the question of why isn't normal ALTER TABLE ok.
If it is because there are a lot of childs, I would like to point a simple script ( if you are fluent in any scripting language, or even in SQL ) can be used to automatically generate a bunch of alter table commands. Even a simple text editor will do ( turn your query above into something generating a bunch of table names, edit it ). Or just try something like ( beware, untested )
with childs as (select relname from pg_class, pg_inherits where pg_class.oid=inhrelid and inhparent='20473) SELECT 'ALTER TABLE ' || relname || ' rest of alter table command;' from childs ;
And feed the result back to the server using your favorite tool ( quoting maybe needed, schema names may be needed, YMMV ). Francisco Olarte.
