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Don Burleson Blog 







Display all Oracle schemas

Oracle Database Tips by Donald BurlesonMay 13,  2015

Question:  I am trying to write a query that will display all schemas in my Oracle database.  A schema owner is a user ID, but it is not necessarily a "real" schema, a user that has populated tables.  How do I write a query to display all of my schemas?

Answer:  It's not easy to identify schema owners in any relational database, but if you make a few assumptions, you can write a dictionary query to display all schemas.  The query below will extract all of the schema names from the Oracle data dictionary.

select distinct

   owner in
   (select username
    from dba_users

    where default_tablespace not in ('SYSTEM','SYSAUX')


select distinct

   owner not in (




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