DDL in active production database

Hi,

I hope I have the correct group here.

I have a question that I am struggling to find answers for in the documentation.  Does Postgres have problems with creation / changes to database schema objects when the database is actively being used?

In particular – rightly or wrongly – our developers want our application to occasionally issue the following kinds of DDL when it’s in active use

Alter table ... add column ...

Create / drop materialised view ...

Create / drop table created with INHERITANCE

I know oracle hates this and you can run into some serious issues, SQL server generally lets you away with it.  

Should we expect problems if we decided to do this in the latest version of Postgres?

Thanks for your time.

Adam