Your database supports a DSS workload that involves the execution of complex queries:
Currently, the library cache contains the ideal workload for analysis. You want to analyze some of the queries
for an application that are cached in the library cache.
What must you do to receive recommendations about the efficient use of indexes and materialized views to
improve query performance?
A.
Create a SQL Tuning Set (STS) that contains the queries cached in the library cache and run the SQL
Tuning Advisor (STA) on the workload captured in the STS.
B.
Run the Automatic Workload Repository Monitor (ADDM).
C.
Create an STS that contains the queries cached in the library cache and run the SQL Performance Analyzer
(SPA) on the workload captured in the STS.
D.
Create an STS that contains the queries cached in the library cache and run the SQL Access Advisor on the
workload captured in the STS.
Explanation:
* SQL Access Advisor is primarily responsible for making schema modification recommendations, such as
adding or dropping indexes and materialized views. SQL Tuning Advisor makes other types of
recommendations, such as creating SQL profiles and restructuring SQL statements.
* The query optimizer can also help you tune SQL statements. By using SQL Tuning Advisor and SQL Access
Advisor, you can invoke the query optimizer in advisory mode to examine a SQL statement or set of statements
and determine how to improve their efficiency. SQL Tuning Advisor and SQL Access Advisor can make various
recommendations, such as creating SQL profiles, restructuring SQL statements, creating additional indexes or
materialized views, and refreshing optimizer statistics.
Note:
* Decision support system (DSS) workload
* The library cache is a shared pool memory structure that stores executable SQL and PL/SQL code. This
cache contains the shared SQL and PL/SQL areas and control structures such as locks and library cache
handles.
Tuning SQL Statements