Oracle10g SQL tune adviser簡單介紹
Oracle10g SQL tune adviser簡單介紹
本文簡單介紹下SQL Tuning Adviser的配置使用方法和一些相關知識點，如果瞭解SQL Tuning Adviser詳細資訊，參看Oracle聯機文件。本文對分析結果沒有詳細分析。
一、自動SQL Tuning簡單介紹：
1、優化模式：
10G增強的優化模式有兩種：
a、Normal mode
在普通優化模式下，優化器編譯sql然後產生執行計劃。普通優化模式下優化器能夠快速的為sql語句產生可行的執行計劃。
b、Tuning mode
在tuning mode模式下，優化器將花費額外的時間檢查一個普通模式下產生的執行計劃是否可以優化。優化器的輸出結果將不僅僅是產生一個執行計劃，
而將執行一系列的動作，在該模式下優化器也許化肥幾分鐘去調整一個語句。每次一個sql語句被硬解析後將在自動調整優化上花費更多的時間和資源。
sql自動調整優化更適用於有複雜sql或者high-load sql的系統（例如addm中標記為高負載的sql就非常適合作為sql自動調整的目標）。
2、 SQL Tuning型別
Automatic SQL Tuning包含四種型別的分析:
a、Statistics Analysis
b、SQL Profiling
c、Access Path Analysis
d、SQL Structure Analysis
二、SQL Tuning Adviser：
1、授予使用者相應許可權：
CONN sys/password AS SYSDBA
GRANT ADVISOR TO TEST;
CONN TEST/TEST
2、建立Tuning任務：
可以通過以下方式建立Tuning任務：
a、Automatic Workload Repository (AWR)
b、the cursor cache
c、SQL tuning set
d、specified manually
SET SERVEROUTPUT ON
--a、通過AWR設定Tuning任務.
SQL> conn /as sysdba
已連線。
--檢視AWR的SNAPSHOT資訊：
SQL> SELECT max(snap_id) FROM WRM$_SNAPSHOT;
MAX(SNAP_ID)
------------
201
--檢視SNAP間隔：
SQL> select snap_interval, retention from dba_hist_wr_control;
SNAP_INTERVAL RETENTION
------------------------------ ------------------------------
+00000 01:00:00.0 +00007 00:00:00.0
--我們可以手工縮短AWR取樣時間間隔（加快測試速度，本利採用手工執行建立SNAPSHOT的方法）：
begin
dbms_workload_repository.modify_snapshot_settings (
interval => 10,
retention => 10*24*60
);
end;
SQL> conn test/test
已連線。
--執行目標SQL：
SQL> select /*We will trace this sql*/ name,addr,insertdata from (select name,ad
dr,insertdata,rank() over(partition by name,addr order by insertdata desc) rn fr
om t ) where rn = 1;
NAME ADDR INSERTDATA
---------- -------------------- -------------------
王 上海 19-12-2006 10:09:33
王1 上海 16-12-2006 10:11:15
王2 上海 16-12-2006 10:11:15
張 北京 19-12-2006 10:08:42
--查詢SQL_ID：
SQL> select sql_id,executions from v$sqlarea where lower(sql_text) like '%we wil
l trace this sql%';
SQL_ID EXECUTIONS
------------- ----------
8zu31x4adn76f 1
1k659753fzcxn 1
SQL> /
SQL_ID EXECUTIONS
------------- ----------
8zu31x4adn76f 2
1k659753fzcxn 1 --我們將分析該SQL
SQL> select sql_id from DBA_HIST_SQLSTAT where sql_id='1k659753fzcxn';
未選定行
--手工建立新的AWR SNAPSHOT：
SQL> execute dbms_workload_repository.create_snapshot;
PL/SQL 過程已成功完成。
SQL> select sql_id from DBA_HIST_SQLSTAT where sql_id='1k659753fzcxn';
SQL_ID
-------------
1k659753fzcxn
--建立Tuning task：
SQL> DECLARE
2 l_sql_tune_task_id VARCHAR2(100);
3 BEGIN
4 l_sql_tune_task_id := DBMS_SQLTUNE.create_tuning_task (
5 begin_snap => 201,
6 end_snap => 202,
7 sql_id => '1k659753fzcxn',
8 scope => DBMS_SQLTUNE.scope_comprehensive,
9 time_limit => 60,
10 task_name => '1k659753fzcxn_awr_tuning_task',
11 description => 'Tuning task for statement 1k659753fzcxn in AWR.');
12 DBMS_OUTPUT.put_line('l_sql_tune_task_id: ' || l_sql_tune_task_id);
13 END;
14 /
PL/SQL 過程已成功完成。
SQL> SELECT task_name, status FROM dba_advisor_log WHERE wner = 'TEST';
TASK_NAME STATUS
------------------------------ -----------
ADDM:1184202927_1_201 COMPLETED
ADDM:1184202927_1_202 COMPLETED
1k659753fzcxn_awr_tuning_task INITIAL
--執行Tuning task：
SQL> EXEC DBMS_SQLTUNE.execute_tuning_task(task_name => '1k659753fzcxn_awr_tuning_task');
PL/SQL 過程已成功完成。
SQL> SET LONG 999999;
SQL> SET PAGESIZE 1000
SQL> SET LINESIZE 200
--檢視Tuning advice：
SQL> SELECT DBMS_SQLTUNE.report_tuning_task('1k659753fzcxn_awr_tuning_task') AS recommendations FROM dual;
RECOMMENDATIONS
--------------------------------------------------------------------------------
GENERAL INFORMATION SECTION
-------------------------------------------------------------------------------
Tuning Task Name : 1k659753fzcxn_awr_tuning_task
Tuning Task Owner : TEST
Scope : COMPREHENSIVE
Time Limit(seconds) : 60
Completion Status : COMPLETED
Started at : 07/09/2008 22:40:27
Completed at : 07/09/2008 22:40:28
-------------------------------------------------------------------------------
Schema Name: TEST
SQL ID : 1k659753fzcxn
SQL Text : select /*We will trace this sql*/ name,addr,insertdata from
(select name,addr,insertdata,rank() over(partition by name,addr
order by insertdata desc) rn from t ) where rn = 1
-------------------------------------------------------------------------------
ADDITIONAL INFORMATION SECTION
-------------------------------------------------------------------------------
-優化程式不能合併位於執行計劃的行 ID 1 處的檢視。.
-------------------------------------------------------------------------------
EXPLAIN PLANS SECTION
-------------------------------------------------------------------------------
1- Original
-----------
Plan hash value: 3047187157
--------------------------------------------------------------------------------
-
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time
|
--------------------------------------------------------------------------------
-
| 0 | SELECT STATEMENT | | 8 | 368 | 4 (25)| 00:00:01
|
|* 1 | VIEW | | 8 | 368 | 4 (25)| 00:00:01
|
|* 2 | WINDOW SORT PUSHED RANK| | 8 | 136 | 4 (25)| 00:00:01
|
| 3 | TABLE ACCESS FULL | T | 8 | 136 | 3 (0)| 00:00:01
|
--------------------------------------------------------------------------------
-
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter("RN"=1)
2 - filter(RANK() OVER ( PARTITION BY "NAME","ADDR" ORDER BY
INTERNAL_FUNCTION("INSERTDATA") DESC )<=1)
-------------------------------------------------------------------------------
--中斷Tuning task：
EXEC DBMS_SQLTUNE.interrupt_tuning_task (task_name => '1k659753fzcxn_awr_tuning_task');
--繼續Tuning task：
EXEC DBMS_SQLTUNE.resume_tuning_task (task_name => '1k659753fzcxn_awr_tuning_task');
--取消Tuning task：
EXEC DBMS_SQLTUNE.cancel_tuning_task (task_name => '1k659753fzcxn_awr_tuning_task');
--重置Tuning task：
SQL> SELECT task_name, status FROM dba_advisor_log WHERE wner = 'TEST';
TASK_NAME STATUS
------------------------------ -----------
ADDM:1184202927_1_201 COMPLETED
ADDM:1184202927_1_202 COMPLETED
1k659753fzcxn_awr_tuning_task COMPLETED
SQL> EXEC DBMS_SQLTUNE.reset_tuning_task (task_name => '1k659753fzcxn_awr_tuning_task');
PL/SQL 過程已成功完成。
SQL> SELECT task_name, status FROM dba_advisor_log WHERE wner = 'TEST';
TASK_NAME STATUS
------------------------------ -----------
ADDM:1184202927_1_201 COMPLETED
ADDM:1184202927_1_202 COMPLETED
1k659753fzcxn_awr_tuning_task INITIAL
--刪除Tuning task：
SQL> BEGIN
2 DBMS_SQLTUNE.drop_tuning_task (task_name => '1k659753fzcxn_awr_tuning_task');
3 END;
4 /
PL/SQL 過程已成功完成。
SQL> SELECT task_name, status FROM dba_advisor_log WHERE wner = 'TEST';
TASK_NAME STATUS
------------------------------ -----------
ADDM:1184202927_1_201 COMPLETED
ADDM:1184202927_1_202 COMPLETED
--b、通過cursor cache設定Tuning任務.
--方法大致如下，這裡我們就不再另外舉例了。
DECLARE
l_sql_tune_task_id VARCHAR2(100);
BEGIN
l_sql_tune_task_id := DBMS_SQLTUNE.create_tuning_task (
sql_id => '1k659753fzcxn',
scope => DBMS_SQLTUNE.scope_comprehensive,
time_limit => 60,
task_name => '1k659753fzcxn_tuning_task',
description => 'Tuning task for statement 1k659753fzcxn.');
DBMS_OUTPUT.put_line('l_sql_tune_task_id: ' || l_sql_tune_task_id);
END;
/
--c、通過SQL tuning set設定Tuning任務.
我們可以建立調整SQL的集合：
SQL> CONN /AS SYSDBA
已連線。
SQL> GRANT ADMINISTER ANY SQL TUNING SET TO TEST;
授權成功。
SQL> CONN TEST/TEST
已連線。
SQL> BEGIN
2 DBMS_SQLTUNE.create_sqlset (
3 sqlset_name => 'test_sql_tuning_set',
4 description => 'A test SQL tuning set.');
5 END;
6 /
PL/SQL 過程已成功完成。
SQL> SELECT OWNER,NAME FROM DBA_SQLSET;
OWNER NAME
------------------------------ ------------------------------
TEST test_sql_tuning_set
SQL> declare
2 cur dbms_sqltune.sqlset_cursor;
3 begin
4 open cur for select value(p) from table(dbms_sqltune.select_cursor_cache('parsing_schema_name = ''TEST'' ',null,null,null,null,1,null,'ALL')) P;
5 dbms_sqltune.load_sqlset(sqlset_name=>'test_sql_tuning_set',populate_cursor=>cur);
6 end;
7 /
PL/SQL 過程已成功完成。
SQL> select count(*) from table(dbms_sqltune.select_sqlset('test_sql_tuning_set'
, 'parsing_schema_name = ''TEST'' '));
COUNT(*)
----------
17
SQL> declare
2 my_task_name varchar2(30);
3 begin
4 my_task_name := dbms_sqltune.create_tuning_task(sqlset_name=>'test_sql_tuning_set',
5 time_limit=>600,
6 scope=>'COMPREHENSIVE',
7 task_name=>'test_tuning_task',
8 description=>'test tuning task');
9 end;
10 /
PL/SQL 過程已成功完成。
SQL> begin
2 dbms_sqltune.set_tuning_task_parameter(
3 task_name=> 'test_tuning_task',
4 parameter => 'TIME_LIMIT',
5 value=>800);
6 end;
7 /
PL/SQL 過程已成功完成。
SQL> exec dbms_sqltune.execute_tuning_task(task_name => 'test_tuning_task');
PL/SQL 過程已成功完成。
SQL> set long 999999
SQL> set longchunksize 1000
SQL> set linesize 200
SQL> select dbms_sqltune.report_tuning_task('test_tuning_task') from dual;
DBMS_SQLTUNE.REPORT_TUNING_TASK('TEST_TUNING_TASK')
-------------------------------------------------------------------------------------------------------------------------------
GENERAL INFORMATION SECTION
-------------------------------------------------------------------------------
Tuning Task Name : test_tuning_task
Tuning Task Owner : TEST
Scope : COMPREHENSIVE
Time Limit(seconds) : 800
Completion Status : COMPLETED
Started at : 07/10/2008 12:38:55
Completed at : 07/10/2008 12:38:59
SQL Tuning Set (STS) Name : test_sql_tuning_set
SQL Tuning Set Owner : TEST
DBMS_SQLTUNE.REPORT_TUNING_TASK('TEST_TUNING_TASK')
-------------------------------------------------------------------------------------------------------------------------------
Number of Statements in the STS : 17
Number of Statements in the Report: 17
Number of Statements with Findings: 7
Number of Statistic Findings : 9
Number of SQL Profile Findings : 2
Number of SQL Restructure Findings: 1
Number of Errors : 1
.........................................
.........................................
這裡就不顯示分析結果了，上千行的分析結果。
和建立Tuning task類似，select_sqlset也可以從AWR中獲得sql集合，也可拷貝其他集合。這裡不再詳細介紹。
--d、通過manually specified statement設定Tuning任務.
--沒有繫結變數的情況：
SQL> DECLARE
2 l_sql VARCHAR2(500);
3 l_sql_tune_task_id VARCHAR2(100);
4 BEGIN
5 l_sql := 'select /*We will trace this sql*/ name,addr,insertdata from
(select name,addr,insertdata,rank() over(partition by name,addr order by
insertdatadesc) rn from t ) where rn = 1';
7 l_sql_tune_task_id := DBMS_SQLTUNE.create_tuning_task (
8 sql_text => l_sql,
9 user_name => 'TEST',
10 scope => DBMS_SQLTUNE.scope_comprehensive,
11 time_limit => 60,
12 task_name => 'test_tuning_task',
13 description => 'Tuning task for an a simple query.');
14 DBMS_OUTPUT.put_line('l_sql_tune_task_id: ' || l_sql_tune_task_id);
15 END;
16 /
PL/SQL 過程已成功完成。
SQL> EXEC DBMS_SQLTUNE.execute_tuning_task(task_name => 'test_tuning_task');
PL/SQL 過程已成功完成。
SQL> SELECT DBMS_SQLTUNE.report_tuning_task('test_tuning_task') AS recommendations FROM dual;
RECOMMENDATIONS
--------------------------------------------------------------------------------
GENERAL INFORMATION SECTION
-------------------------------------------------------------------------------
Tuning Task Name : test_tuning_task
Tuning Task Owner : TEST
Scope : COMPREHENSIVE
Time Limit(seconds) : 60
Completion Status : COMPLETED
Started at : 07/10/2008 01:17:09
Completed at : 07/10/2008 01:17:09
Number of Statistic Findings : 1
RECOMMENDATIONS
--------------------------------------------------------------------------------
Schema Name: TEST
SQL ID : 3zdbsrhb1mhuq --該處的sql_id顯示不正確，可能是oracle的一個 bug
SQL Text : select /*We will trace this sql*/ name,addr,insertdata from
(select name,addr,insertdata,rank() over(partition by name,addr
order by insertdata desc) rn from t ) where rn = 1
-------------------------------------------------------------------------------
FINDINGS SECTION (1 finding)
-------------------------------------------------------------------------------
RECOMMENDATIONS
--------------------------------------------------------------------------------
1- Statistics Finding
---------------------
尚未分析表 "TEST"."
Recommendation
--------------
- 考慮收集此表的優
execute dbms_stats.gather_table_stats(ownname => 'TEST', tabname => 'T',
estimate_percent => DBMS_STATS.AUTO_SAMPLE_SIZE, method_opt =>
'FOR ALL COLUMNS SIZE AUTO');
RECOMMENDATIONS
--------------------------------------------------------------------------------
Rationale
---------
為了選擇好的執行計劃, 優化程式需
-------------------------------------------------------------------------------
ADDITIONAL INFORMATION SECTION
-------------------------------------------------------------------------------
-優化程式不能合併位於執行計劃的行 ID 1 處的檢視。.
-------------------------------------------------------------------------------
EXPLAIN PLANS SECTION
RECOMMENDATIONS
--------------------------------------------------------------------------------
1- Original
-----------
Plan hash value: 3047187157
--------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time
--------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 8 | 368 | 4 (25)| 00:00:01
|* 1 | VIEW | | 8 | 368 | 4 (25)| 00:00:01
RECOMMENDATIONS
--------------------------------------------------------------------------------
|* 2 | WINDOW SORT PUSHED RANK| | 8 | 264 | 4 (25)| 00:00:01
| 3 | TABLE ACCESS FULL | T | 8 | 264 | 3 (0)| 00:00:01
--------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter("RN"=1)
2 - filter(RANK() OVER ( PARTITION BY "NAME","ADDR" ORDER BY
INTERNAL_FUNCTION("INSERTDATA") DESC )<=1)
RECOMMENDATIONS
--------------------------------------------------------------------------------
--帶有繫結變數的情況：
SQL> variable var_1 number;
SQL> variable var_2 number;
SQL> variable var_3 number;
SQL> exec :var_1 := 5;
PL/SQL 過程已成功完成。
SQL> exec :var_2 := 4;
PL/SQL 過程已成功完成。
SQL> exec :var_3 := 3;
PL/SQL 過程已成功完成。
SQL> select id,name,addr from t where id<>:var_1 and id<:var_2 and="" id="">
ID NAME ADDR
---------- -------------------- --------------------
1 張 北京
2 張 北京
SQL> SELECT task_name, status FROM dba_advisor_log WHERE wner = 'TEST';
TASK_NAME STATUS
------------------------------ -----------
ADDM:1184202927_1_201 COMPLETED
ADDM:1184202927_1_202 COMPLETED
test_tuning_task COMPLETED
SQL> BEGIN
2 DBMS_SQLTUNE.drop_tuning_task (task_name => 'test_tuning_task');
3 END;
4 /
PL/SQL 過程已成功完成。
SQL>
SQL>
SQL> DECLARE
2 l_sql VARCHAR2(500);
3 l_sql_tune_task_id VARCHAR2(100);
4 BEGIN
5 l_sql := 'select id,name,addr from t where id<>:var_1 and id<:var_2 and="" i=""> d<:var_3> 6
7 l_sql_tune_task_id := DBMS_SQLTUNE.create_tuning_task (
8 sql_text => l_sql,
9 bind_list => sql_binds(anydata.ConvertNumber(5),
anydata.ConvertNumber(4),anydata.ConvertNumber(3)),
10 user_name => 'TEST',
11 scope => DBMS_SQLTUNE.scope_comprehensive,
12 time_limit => 60,
13 task_name => 'test_tuning_task',
14 description => 'Tuning task for an a simple query
.');
15 DBMS_OUTPUT.put_line('l_sql_tune_task_id: ' || l_sql_tune_task_id);
16 END;
17 /
PL/SQL 過程已成功完成。
SQL> SELECT * FROM DBA_SQLTUNE_BINDS;
TASK_ID OBJECT_ID POSITION VALUE()
---------- ---------- ---------- --------------------
393 1 1 ANYDATA()
393 1 2 ANYDATA()
393 1 3 ANYDATA()
SQL> EXEC DBMS_SQLTUNE.execute_tuning_task(task_name => 'test_tuning_task');
PL/SQL 過程已成功完成。
SQL> SELECT DBMS_SQLTUNE.report_tuning_task('test_tuning_task') AS recommendatio
ns FROM dual;
RECOMMENDATIONS
--------------------------------------------------------------------------------
GENERAL INFORMATION SECTION
-------------------------------------------------------------------------------
Tuning Task Name : test_tuning_task
Tuning Task Owner : TEST
Scope : COMPREHENSIVE
Time Limit(seconds) : 60
Completion Status : COMPLETED
Started at : 07/10/2008 02:04:29
Completed at : 07/10/2008 02:04:29
Number of Statistic Findings : 1
RECOMMENDATIONS
--------------------------------------------------------------------------------
-------------------------------------------------------------------------------
Schema Name: TEST
SQL ID : 15c91q9b2sxvk --該處的sql_id顯示不正確，可能是oracle的一個 bug
SQL Text : select id,name,addr from t where id<>:var_1 and id<:var_2 and=""> id<:var_3>
-------------------------------------------------------------------------------
FINDINGS SECTION (1 finding)
-------------------------------------------------------------------------------
1- Statistics Finding
RECOMMENDATIONS
--------------------------------------------------------------------------------
尚未分析表 "TEST"."
Recommendation
- 考慮收集此表的優
execute dbms_stats.gather_table_stats(ownname => 'TEST', tabname => 'T',
estimate_percent => DBMS_STATS.AUTO_SAMPLE_SIZE, method_opt =>
'FOR ALL COLUMNS SIZE AUTO');
Rationale
RECOMMENDATIONS
--------------------------------------------------------------------------------
為了選擇好的執行計劃, 優化程式需
-------------------------------------------------------------------------------
EXPLAIN PLANS SECTION
-------------------------------------------------------------------------------
1- Original
-----------
Plan hash value: 1601196873
RECOMMENDATIONS
--------------------------------------------------------------------------------
--------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 8 | 296 | 3 (0)| 00:00:01 |
|* 1 | TABLE ACCESS FULL| T | 8 | 296 | 3 (0)| 00:00:01 |
--------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter("ID"<>:VAR_1 AND "ID"<:var_2 and="">
RECOMMENDATIONS
--------------------------------------------------------------------------------
三、SQL Profile：
由於缺少各種資訊，優化器有時候會產生不正確的執行計劃，通常我們可以指定hints來干預執行計劃。
SQL AUTO TUNING通過SQL Profiling來解決類似的問題。自動調整優化器會建立SQL Profile，SQL Profile包含SQL語句的輔助統計資訊。
普通優化模式下，優化器通過估算出一個集式、選擇性、cost來最後決定使用什麼樣的執行計劃。SQL Profile利用儲存的額外的資訊，
通過取樣或者部分執行的方式來驗證一個執行計劃是否為最優化，儲存歷史執行統計資訊。
如果一個tuning task accept SQL Profile，SQL Profile將被永久儲存在資料字典中。普通優化模式下，優化器在產生執行計劃的時候
將利用資料庫的統計資訊結合SQL Profile的資訊一起分析，最終產生最優化的執行計劃。
可以利用CATAGORY控制SQL Profile的使用許可權，資料庫引數sqltune_category為預設DEFAULT。
SQL> SHOW PARAMETER SQLTUNE
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
sqltune_category string DEFAULT
我們也可以修改資料庫引數檔案，指定我們自己的SQLTUNE_CATEGORY：
ALTER SYSTEM SET SQLTUNE_CATEGORY = PROD;
SQL Profiles apply to the following statement types:
SELECT statements
UPDATE statements
INSERT statements (only with a SELECT clause)
DELETE statements
CREATE TABLE statements (only with the AS SELECT clause)
MERGE statements (the update or insert operations)
SQL Profile基本操作：
SQL> conn /as sysdba
已連線。
SQL> GRANT CREATE ANY SQL_PROFILE TO TEST;
授權成功。
SQL> GRANT DROP ANY SQL PROFILE TO TEST;
授權成功。
SQL> GRANT ALTER ANY SQL PROFILE TO TEST;
授權成功。
SQL> CONN TEST/TEST
已連線。
SET SERVEROUTPUT ON
DECLARE
l_sql_tune_task_id VARCHAR2(20);
BEGIN
l_sql_tune_task_id := DBMS_SQLTUNE.accept_sql_profile (
task_name => 'test_tuning_task',
name => 'test_profile');
DBMS_OUTPUT.put_line('l_sql_tune_task_id: ' || l_sql_tune_task_id);
END;
/
BEGIN
DBMS_SQLTUNE.alter_sql_profile (
name => 'test_profile',
attribute_name => 'STATUS',
value => 'DISABLED');
END;
/
BEGIN
DBMS_SQLTUNE.drop_sql_profile (
name => 'test_profile',
ignore => TRUE);
END;
/
--example:
SQL> execute dbms_sqltune.accept_sql_profile(task_name => 'test_tuning_task',object_id => 6, replace => TRUE);
SQL> select count(1) from DBA_SQL_PROFILES;
COUNT(1)
----------
1
PL/SQL 過程已成功完成。
四、幾個有用的automatic SQL tuning相關的資料字典:
DBA_ADVISOR_TASKS
DBA_ADVISOR_FINDINGS
DBA_ADVISOR_RECOMMENDATIONS
DBA_ADVISOR_RATIONALE
DBA_SQLTUNE_STATISTICS
DBA_SQLTUNE_BINDS
DBA_SQLTUNE_PLANS
DBA_SQLSET
DBA_SQLSET_BINDS
DBA_SQLSET_STATEMENTS
DBA_SQLSET_REFERENCES
DBA_SQL_PROFILES
V$SQL
V$SQLAREA
V$ACTIVE_SESSION_HISTORY
五、DBMS_SQLTUNE包的詳細方法可以參考：
http://download-west.oracle.com/docs/cd/B13789_01/appdev.101/b10802/d_sqltun.htm
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