369.Which of the following identifies and creates an index to minimize the DB time for a particular SQL
statement?
A. The SGA Tuning Advisor
B. The SQL Access Advisor
C. The SQL Tuning Advisor
D. The Memory Advisor
Answer: C
答案解析：
下列哪项识别和创建索引，以尽量减少DB时间为特定的SQL语句?
SQL优化指导：分析各个 SQL 语句, 并建议 SQL 概要文件, 统计信息, 索引和重构的 SQL 以改善 SQL 性能。
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The SQL Access Advisor allows the DBA to gather global recommendations for a workload. The SQL Tuning
advisor is more granular, tuning a single statement.
The main functions of the SQL Access advisor is to recommend missing indexes and materialized views, but
a comprehensive task analysis will also create SQL Profiles that can be used within the SQL Tuning advisor.
The DBA defines the SQL used in the SQL Access Advisor task, and can choose current SQL, a user-defined
set of SQL, a historical workload, or a hypotheticalworkload.
A hypothetical workload is very useful because the DBA need-only specify the tables that participate in the
queries, and the SQL Access Advisor gathers the appropriate SQL statements to create theworkload.
http://www.dba-oracle.com/oracle10g_tuning/t_sql_access_advisor.htm
The SQL Tuning Advisor (STA) is primarily designed to replace the manual tuningof SQL statements and
speed up the overall SQL tuning process. The SQL Tuning Advisor studies poorly executing SQL statements
and evaluates resource consumption in terms of CPU, I/O, and temporary space.
The SQL Tuning Advisor (STA) works with the Automatic Tuning Optimizer (ATO) to analyze historical SQL
workload using data from the AWR, and it generates recommendations for new indexes and materialized views
that will reduce the disk I/O associated with troublesome SQL statements.
http://www.dba-oracle.com/oracle10g_tuning/t_sql_tuning_advisor.htm