本文介绍了Oracle SQL调优顾问的三大核心功能：构建并实施SQL配置文件、检查查询对象缺失及陈旧统计信息、推荐重构使用不佳计划的SQL查询。这些功能有助于提升高负载SQL语句的性能。
Which three functions are performed by the SQL Tuning Advisor?
A. Building and implementing SQL profiles
B. Recommending the optimization of materialized views
C. Checking query objects for missing and stale statistics
D. Recommending bitmap, function-based, and B-tree indexes
E. Recommending the restructuring of SQL queries that are using bad plans
Answer: A,C,E
答案解析：
在12C 官方文档的位置：
http://docs.oracle.com/database/121/TGSQL/tgsql_sqltune.htm#TGSQL540
Purpose of SQL Tuning Advisor
SQL Tuning Advisor is a mechanism for resolving problems related to suboptimally performing SQL statements. Use SQL Tuning Advisor to obtain recommendations for improving performance of high-load SQL statements, and prevent regressions by only executing optimal plans.
Tuning recommendations include:
Collection of object statistics
Creation of indexes
Rewriting SQL statements
Creation of SQL profiles
Creation of SQL plan baselines
The SQL Tuning Advisor takes one or more SQL statements as an input and
invokes the Automatic Tuning Optimizer to perform SQL tuning on the statements. The
output of the SQL Tuning Advisor is in the form of an advice or recommendations, along
with a rationale for each recommendation and its expected benefit. The recommendation
relates to collection of statistics on objects (C), creation of new indexes, restructuring of the
SQL statement (E), or creation of a SQL profile (A). You can choose to accept the
recommendation to complete the tuning of the SQL statements.
B，D这两个答案是SQL ACCESS ADVISOR这个工作所完成的
A. Building and implementing SQL profiles
B. Recommending the optimization of materialized views
C. Checking query objects for missing and stale statistics
D. Recommending bitmap, function-based, and B-tree indexes
E. Recommending the restructuring of SQL queries that are using bad plans
Answer: A,C,E
答案解析：
在12C 官方文档的位置：
http://docs.oracle.com/database/121/TGSQL/tgsql_sqltune.htm#TGSQL540
Purpose of SQL Tuning Advisor
SQL Tuning Advisor is a mechanism for resolving problems related to suboptimally performing SQL statements. Use SQL Tuning Advisor to obtain recommendations for improving performance of high-load SQL statements, and prevent regressions by only executing optimal plans.
Tuning recommendations include:
Collection of object statistics
Creation of indexes
Rewriting SQL statements
Creation of SQL profiles
Creation of SQL plan baselines
The SQL Tuning Advisor takes one or more SQL statements as an input and
invokes the Automatic Tuning Optimizer to perform SQL tuning on the statements. The
output of the SQL Tuning Advisor is in the form of an advice or recommendations, along
with a rationale for each recommendation and its expected benefit. The recommendation
relates to collection of statistics on objects (C), creation of new indexes, restructuring of the
SQL statement (E), or creation of a SQL profile (A). You can choose to accept the
recommendation to complete the tuning of the SQL statements.
B，D这两个答案是SQL ACCESS ADVISOR这个工作所完成的
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