OCP-1Z0-053-200题-160题-294

QUESTION 160

Which tuning tool recommends how to optimize materialized views so that these views can take advantage of

the general query rewrite feature?

A. Segment Advisor

B. SQL Access Advisor

C. Undo Advisor

D. SQL Tuning Advisor

Answer: B

同294题：http://blog.csdn.net/rlhua/article/details/13503023

Explanation/Reference:

Section: Managing Database Performance & Tuning

SQL Access Advisor recommends how to optimize materialized views so that these views can take advantage

of the general query rewrite feature. To achieve optimum performance for complex, data-intensive queries,

you need to use materialized views and indexes. TheSQL Access Advisor helps you achieve your

performance goals by recommending the proper set ofmaterialized views, materialized view logs, and indexes

for a given workload. The SQL Access Advisor can use current SQL, an existing SQL Tuning Set (STS), or a

hypothetical workload to make its recommendations.

The option stating ADDM is incorrect. ADDM recommendations are based on the following:

- Hardware changes - Adding CPUs or changing the I/O subsystem configuration

- Database configuration - Changing initialization parameter settings

- Schema changes - Hash partitioning of a table or index

- Application changes - Using the cache option for sequences or using bind variables

- Using other advisors - Running the SQL Tuning Advisor on high load SQL

or running the Segment Advisor on hot objects

ADDM does not recommend how to optimize materializedviews.

The Undo Advisor does not recommend how to optimize materialized views. The Undo Advisor helps you to

estimate the space that you will need to store undoinformation.

Segment Advisor does not recommend how to optimize materialized views. Segment Advisor helps to

determine whether an object has space available forreclamation.