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.
Reference: Tuning SQL Statements
D
D