How to find these different namespaces in the schema?

Hello

I heard that this schema contains different namespaces. How to find these different namespaces in the schema?

I checked with this, but it is throwing "table or view does not exist.

Select the namespace of v$ librarycache.


Thank you
Praveen

Are you referring to this? From the reference manual of the SQL language under the schema object names and qualifiers

7. part of a namespace, no two objects can have the same name.
The following schema objects share a namespace:
Tables
Display
Sequences
Private synonyms
Autonomous procedures
Autonomous stored functions
Packages
Materialized views
User-defined types

Each of the following schema objects has its own namespace:
Index
Constraints
Clusters
Database triggers
Private database links
Dimensions

Because tables and views are in the same namespace, a table and a view in the same schema cannot have the same name. However, the tables and indexes are in different namespaces. Therefore, a table and an index in the same schema may have the same name.

Each schema in the database has its own namespaces for objects that it contains. This means, for example, two tables in different schemas are in different namespaces and can have the same name.

Each of the following schema objects also have its own namespace:
User roles
Public synonyms
Links to public database
Storage spaces
Profiles of school boards
The files (PFILEs) settings and server settings (SPFILEs) files

Because objects in these namespaces do not appear in the drawings, these namespaces cover the entire base.

That's why you can do:

SQL> create table t (id number, descr varchar2(10));

Table created.

SQL> alter table t add constraint t check (mod(id,2) = 0);

Table altered.

SQL> create index t on t(id);

Index created.

SQL> create trigger t
  2  before update on t
  3  begin
  4     dbms_output.put_line('T Trigger');
  5  end;
  6  /

Trigger created.

but not:

SQL> create view t as select * from t;
create view t as select * from t
            *
ERROR at line 1:
ORA-00955: name is already used by an existing object

or

SQL> create procedure t
  2  begin
  3     null;
  4  end;
  5  /
create procedure t
*
ERROR at line 1:
ORA-00955: name is already used by an existing object

John

Tags: Database

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