Sometimes you may need to do several ddl statements in a database.Suppose in a file you have list of DDL creation script. Now after creating some objects some DDL commands fails and it proceed further. As DDL tasks can't be rolled back so it may be cumbersome and difficult to identify/track which DDL command is actually failed. There is a command CREATE SCHEMA by which it can be ensured that either entire statement will successfully executed or entire statement will fail.
You can create several tables and views and grant privileges in one operation using the CREATE SCHEMA statement.
If an individual table, view or grant fails, the entire statement is rolled back. None of the objects are created, nor are the privileges granted.
The CREATE SCHEMA statement can include only CREATE TABLE, CREATE VIEW, and GRANT statements.
Remember by using statement CREATE SCHEMA you are not actually creating a schema, that is done when the user is created with a CREATE USER statement. Rather, you are populating the schema.
Example:
---------
With following example a table named table1 and a view named view1 will be created under ARJU schema.
SQL> conn arju/a
Connected.
SQL> CREATE SCHEMA AUTHORIZATION arju create table table1(a number primary key) create view view1 as select * from table1;
Schema created.
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