1z0-071 Exam Dumps : Oracle Database 12c SQL

Regarding creating tables in an Oracle database:

B. The same table name can be used for tables in different schemas: In Oracle, a schema is essentially a namespace within the database; thus, the same table name can exist in different schemas without conflict, as each schema is distinct.

C. A system privilege is required: To create tables, a user must have the necessary system privileges, typically granted explicitly or through roles such as CREATE TABLE or administrative privileges depending on the environment setup.

Incorrect options for all three repeated questions:

A: Oracle SQL does not allow specifying the maximum number of rows directly in a CREATE TABLE statement; this is controlled by storage allocation and database design rather than table creation syntax.

D: Creating an external table does not create the physical file. It merely creates a table structure that allows access to data stored in an external file specified in the directory; the file itself must already exist or be managed outside of Oracle.

E: A primary key constraint is not mandatory for creating tables. While it is a common practice to define a primary key to enforce entity integrity, it is not required by the Oracle SQL syntax for table creation.

These answers and explanations are aligned with Oracle Database 12c SQL documentation and standard practices.

Synonyms in Oracle Database are aliases for database objects.

A. Correct. A synonym can be created for another synonym, essentially chaining synonyms. B. Incorrect. Private synonyms must be unique within a schema. However, because each user has their own schema, multiple users can have private synonyms with the same name, each pointing to objects in their respective schemas. C. Correct. Any user with the necessary privileges can create a PUBLIC synonym, which is accessible to all users. D. Incorrect. A synonym cannot be created for an object within a package, but it can be created for the package itself. E. Incorrect. Synonyms, like views, do not have object numbers because they do not occupy space in the database as tables do.

References can be found in the Oracle Database SQL Language Reference documentation, which details the rules and functionality of synonyms.