To answer this question, you need to understand the concept of Primary Index in database management systems. Let's go through each option to understand why it is correct or incorrect:
Option A) Defined immediately after the table CREATE statement, used to assign rows to an AMP - This option is incorrect because the Primary Index is not used to assign rows to an AMP. The Primary Index is used to distribute the data across AMPs (Access Module Processors) in a Teradata database.
Option B) Defined immediately after the table CREATE statement, used to find the Primary Key - This option is incorrect because the Primary Index is not used to find the Primary Key. The Primary Key is a constraint that ensures uniqueness of a column or set of columns in a table.
Option C) Defined during the table CREATE statement, used to assign rows to an AMP - This option is correct. The Primary Index is defined during the table CREATE statement and is used to assign rows to an AMP. It determines how the data is distributed across the AMPs for efficient parallel processing.
Option D) Defined during the table CREATE statement, used to find the Primary Key - This option is incorrect because the Primary Index is not used to find the Primary Key.
The correct answer is C) Defined during the table CREATE statement, used to assign rows to an AMP. This option is correct because the Primary Index is defined during the table CREATE statement and is used to assign rows to an AMP.