【INDEX】Oracle19c 自动索引技术初探

来源：这里教程网时间：2026-03-03 16:33:50 作者：

### Oracle19C 自动索引初探
##### Automatic indexing 提供如下功能
- 定期在预定义的时间间隔内在后台运行自动索引过程
- 分析应用程序工作负载，并根据分析报告相应地创建必要的新的索引，并删除现有性能不佳的索引，以提高数据库性能
- 重构由于表分区维护操作(比如ALTER table MOVE)而被标记为不可用的索引(unusable index)
- 提供PL/SQLAPIs，用于配置数据库中的自动索引和生成与自动索引操作相关的报告。
##### 说明：
- 当前版本Auto indexes 是local B-tree 索引
- 支持分区和非分区表，不支持临时表。

#### Automatic indexing 是如何工作的
自动索引基于手动SQL调优的常用方法，它不断评估执行的SQL和基础表，以确定要创建哪些索引以及可能删除哪些索引。它通过专家系统完成此任务，该系统验证索引可能做出的改进，并在创建之后验证所做的假设。然后它使用强化学习来确保它不再犯同样的错误。最重要的是，随着数据模型和访问路径的变化，Oracle数据库19c能够随着时间的推移进行调整。
#####  自动索引过程以后台服务进程每隔15分钟运行一次，并执行如下任务：
- 识别自动索引候选项
> 通过捕获SQL历史到SQL repository（包括SQL，执行计划，绑定变量，统计信息等），识别SQL语句中用到列的使用情况来标识自动索引候选项。
- 为自动索引候选项创建invisible的自动索引
>  Invisible Indexes是11g中提出的新功能，缺省对优化器是不可见的，也就是说不会影响到用户既有的SQL语句。
- 根据SQL语句验证不可见的自动索引
> 如果通过使用这些自动索引提高了SQL语句的性能，那么会将这些索引配置为可见索引，以便在SQL语句中使用它们。
如果使用这些索引不能提高SQL语句的性能，则将这些索引置为unusable的索引，并将对应的SQL语句列入“黑名单”。unusable的索引稍后会被自动索引过程删除。被列入“黑名单”的SQL语句将来不允许使用自动索引。
- 清除unused auto indexes
>  对于长时间不使用的auto indexes会自动进行清除工作。缺省是373天，可以使用DBMS_AUTO_INDEX.CONFIGURE过程来配置数据库中保留未使用的自动索引的时间段。

#### 在数据库中配置AutomaticIndexing
> 注：Automatic indexing特性对于on-prem环境仅支持Oracle Exadata平台，对于Oracle Cloud各个Cloud Edition都支持。
需要设置隐含参数，否则会报错
```
--报错如下：
SQL>  EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_MODE','IMPLEMENT');
BEGIN DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_MODE','IMPLEMENT'); END;
*
ERROR at line 1:
ORA-40216: feature not supported
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 79
ORA-06512: at "SYS.DBMS_AUTO_INDEX_INTERNAL", line 9450
ORA-06512: at "SYS.DBMS_AUTO_INDEX", line 295
ORA-06512: at line 1

--设置隐含参数，并重启数据库
alter system set "_exadata_feature_on"=true scope=spfile;
shutdown immediate
startup
```
##### 启用和禁用Automatic Indexing特性
```
--启用自动索引，并将任何新的自动索引创建为可见索引(visible indexes)，以便在SQL语句中使用
 EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_MODE','IMPLEMENT');
 
--启用自动索引，但将任何新的自动索引创建为不可见索引(invisible indexes)，所以不能在SQL语句中使用
EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_MODE','REPORT ONLY');
--禁用自动索引，这样就不会创建新的自动索引，并禁用现有的自动索引。这也是缺省模式。
EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_MODE','OFF');
```
##### 指定哪些Schemas可以使用Automatic Indexing
当在上一步启用Automatic Indexing特性后，缺省情况下所有的Schemas都可以使用Automatic Indexing。管理员可以根据需要允许哪些schema使用自动索引。eg:
```
--eg: SH
 EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_SCHEMA', 'SH', FALSE);
--后期如果又想让某个用户使用自动索引，比如HR，可以通过如下语句来设置
EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_SCHEMA', 'HR', NULL);
--恢复到缺省（也就是所有Schema都可以使用自动索引）
EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_SCHEMA', NULL, TRUE);
```
##### 为unused auto indexes指定保留期
```
--下面的语句将未使用的自动索引的保留期设置为90天。 
EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_RETENTION_FOR_AUTO', ' 90');
--下面的语句将未使用的自动索引的保留期重置为默认值373天。
EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_RETENTION_FOR_AUTO', NULL);
```
##### 为unused 非自动索引（non-auto indexes）指定保留期
就是为我们手动创建的unused的索引指定一个保留期，缺省情况下，Automatic Indexing Process(自动索引过程)不会删除unused手动创建的索引。
```
--指定一个unused手动索引保留期，比如60天，那么到期后，将会被Automatic Indexing Process(自动索引过程)清除。
EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_RETENTION_FOR_MANUAL', '60');
--恢复到默认值（也就是不给unused 手动索引指定保留期，Automatic Indexing Process不会删除这些索引）
EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_RETENTION_FOR_AUTO',NULL);     
```
##### 为automatic indexing logs指定保留期
```
--缺省是31天，如下示例表示保留60天
EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_REPORT_RETENTION', '60');
--恢复到缺省
EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_REPORT_RETENTION', NULL);
```
> 注意：Automatic indexing reports的生成依赖于automatic indexing logs。所以，当过了automatic indexing logs的保留期后，相应的automatic indexing reports就不能生成了
##### 指定一个表空间存放Auto Indexes
```
-- 缺省情况下，使用当前数据库的缺省持久表空间。可以通过如果配置指定为其他表空间：
EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_DEFAULT_TABLESPACE', 'MYAUTOTBS');
--对于使用缺省持久表空间存放Auto Indexes的情况，可以通过类似如下过程来指定一个空间限额（可以使用到20%），缺省是50%：
EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_SPACE_BUDGET', '20');
```
##### 指定一个临时表空间存放临时Auto Indexes结构
```
--缺省情况下，使用当前数据库的缺省TEMP表空间。可以通过如果配置指定为其他表空间：
EXEC DBMS_AUTO_INDEX.CONFIGURE('AUTO_INDEX_TEMP_TABLESPACE', 'MYAUTOTBS_TEMP');
```
#### 生成Automatic Indexing报告
通过DBMS_AUTO_INDEX包的REPORT_ACTIVITY和REPORT_LAST_ACTIVITY函数可以生成AutomaticIndexing Reports。
比如生成指定时间范围的自动索引报告:
```
set serveroutput on
  declare  
       report clob := null;
   begin
       report := DBMS_AUTO_INDEX.REPORT_ACTIVITY(
                   activity_start => TO_TIMESTAMP('2019-02-17', 'YYYY-MM-DD'),
                    activity_end => TO_TIMESTAMP('2019-02-17', 'YYYY-MM-DD'),
                              type => 'HTML',          --支持TEXT、HTML、XML 3中格式，缺省是TEXT
                          section => 'SUMMARY',    
                              level => 'BASIC');
      dbms_output.put_line(report);
   end;
  /
```
生成最近一次的自动索引报告：
```
set serveroutput on
  declare
       report clob := null;
   begin
       report := DBMS_AUTO_INDEX.REPORT_LAST_ACTIVITY(
                               type => 'HTML',
                           section => 'SUMMARY +INDEX_DETAILS +ERRORS',
                               level => 'BASIC');
      dbms_output.put_line(report);
  end;
 /
```
Automatic Indexing相关的数据字典:
```
DBA_AUTO_INDEX_CONFIG                          --19.1新增视图，描述当前自动索引的配置
   DBA_INDEXES/ALL_INDEXES/USER_INDEXES   --新增加的AUTO列标识是自动索引(YES)还是手动索引(NO)
  DBA_AUTO_INDEX_EXECUTIONS                  --显示历史自动索引任务执行
  DBA_AUTO_INDEX_STATISTICS                   --显示与自动索引相关的统计信息
  DBA_AUTO_INDEX_IND_ACTIONS                --显示在自动索引上执行的操作
  DBA_AUTO_INDEX_SQL_ACTIONS                --显示在SQL上执行的验证自动索引的操作
```
#### Automatic Indexing初体验
##### 检查自动索引缺省配置
```
SQL> /
PARAMETER_NAME				 PARAMETER_VALUE		LAST_MODIFIED					   MODIFIED_BY
---------------------------------------- ------------------------------ -------------------------------------------------- --------------------------------------------------
AUTO_INDEX_COMPRESSION			 OFF
AUTO_INDEX_DEFAULT_TABLESPACE
AUTO_INDEX_MODE 			 IMPLEMENT			08-JUN-20 03.08.17.000000 PM			   SYS
AUTO_INDEX_REPORT_RETENTION		 31
AUTO_INDEX_RETENTION_FOR_AUTO		 373
AUTO_INDEX_RETENTION_FOR_MANUAL
AUTO_INDEX_SCHEMA
AUTO_INDEX_SPACE_BUDGET 		 50
8 rows selected.
SQL> 1
  1* select * from dba_auto_index_config
SQL> select banner_full from v$version;
BANNER_FULL
----------------------------------------------------------------------------------------------------------------------------------------------------------------
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.6.0.0.0
```
##### 准备测试数据
```
alias mytest='sqlplus mytest/test@mypdb'
[oracle@rac19c ~]$ mytest
SQL*Plus: Release 19.0.0.0.0 - Production on Mon Jun 8 15:29:20 2020
Version 19.6.0.0.0
Copyright (c) 1982, 2019, Oracle.  All rights reserved.
Last Successful login time: Wed Apr 15 2020 16:17:43 +08:00
Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.6.0.0.0
SQL> create table test as select * from dba_objects;
Table created.
SQL> insert into test select *from test;
72545 rows created.
SQL> /
145090 rows created.
SQL> /
290180 rows created.
SQL> /
580360 rows created.
SQL> /
1160720 rows created.
SQL> commit;
Commit complete.
SQL> update test set object_id=rownum;
2321440 rows updated.
SQL> commit;
Commit complete.
```
##### 启用Automatic Indexing
```
SQL> exec dbms_auto_index.configure('AUTO_INDEX_MODE','IMPLEMENT');
PL/SQL procedure successfully completed.
SQL> set lines 200
set pages 999
col parameter_name for a40
col parameter_value for a15
col last_modified for a40
col modified_by for a20
select * from dba_auto_index_config;SQL> SQL> SQL> SQL> SQL> SQL> 
PARAMETER_NAME				 PARAMETER_VALUE LAST_MODIFIED				  MODIFIED_BY
---------------------------------------- --------------- ---------------------------------------- --------------------
AUTO_INDEX_COMPRESSION			 OFF
AUTO_INDEX_DEFAULT_TABLESPACE
AUTO_INDEX_MODE 			 IMPLEMENT	 08-JUN-20 04.11.50.000000 PM		  MYTEST
AUTO_INDEX_REPORT_RETENTION		 31
AUTO_INDEX_RETENTION_FOR_AUTO		 373
AUTO_INDEX_RETENTION_FOR_MANUAL
AUTO_INDEX_SCHEMA
AUTO_INDEX_SPACE_BUDGET 		 50
8 rows selected.
```
##### 执行测试SQL
```
select object_name from test where object_id=1;
select object_type from test where object_id=123;
select created from test where object_id=345;
```
##### 检查Automatic Indexing Process的执行情况（15分钟以后）
```
--查看自动索引任务执行情况
col EXECUTION_NAME for a40
col ERROR_MESSAGE for a20
alter session set nls_date_format='yyyy/mm/dd hh24:mi:ss';
select * from dba_auto_index_executions;

--查看该任务与自动索引相关的统计信息
select * from dba_auto_index_statistics where execution_name='SYS_AI_2020-06-08/16:42:12';
EXECUTION_NAME				 STAT_NAME			    VALUE
---------------------------------------- ----------------------------- ----------
SYS_AI_2020-06-08/16:42:12		 Index candidates			3
SYS_AI_2020-06-08/16:42:12		 Indexes created (visible)		1
SYS_AI_2020-06-08/16:42:12		 Indexes created (invisible)		0
SYS_AI_2020-06-08/16:42:12		 Indexes dropped			0
SYS_AI_2020-06-08/16:42:12		 Space used in bytes		 45088768
SYS_AI_2020-06-08/16:42:12		 Space reclaimed in bytes		0
SYS_AI_2020-06-08/16:42:12		 SQL statements verified		3
SYS_AI_2020-06-08/16:42:12		 SQL statements improved		3
SYS_AI_2020-06-08/16:42:12		 SQL statements managed by SPM		0
SYS_AI_2020-06-08/16:42:12		 SQL plan baselines created		0
SYS_AI_2020-06-08/16:42:12		 Improvement percentage 	      100
--查看在自动索引上执行的操作
col index_name for a20
col table_name for a20
col command for a20
col statement for a80
set pages 999
select index_name,table_name,command,statement from dba_auto_index_ind_actions where execution_name='SYS_AI_2020-06-08/16:42:12' order by action_id;
--eg:
INDEX_NAME	     TABLE_NAME 	  COMMAND	       STATEMENT
-------------------- -------------------- -------------------- --------------------------------------------------------------------------------
SYS_AI_6q50typ711dvz TESTA_DEP1 	  CREATE INDEX	       CREATE INDEX "DEP1"."SYS_AI_6q50typ711dvz"   ON "DEP1"."TESTA_DEP1"("C1") TABLES
SYS_AI_7371mg6j5bawt TESTB_DEP1 	  CREATE INDEX	       CREATE INDEX "DEP1"."SYS_AI_7371mg6j5bawt"   ON "DEP1"."TESTB_DEP1"("C1") TABLES
SYS_AI_ap6rzrnxmm8k5 TEST		  CREATE INDEX	       CREATE INDEX "MYTEST"."SYS_AI_ap6rzrnxmm8k5"   ON "MYTEST"."TEST"("OBJECT_ID") T
SYS_AI_ap6rzrnxmm8k5 TEST		  REBUILD INDEX        ALTER INDEX "MYTEST"."SYS_AI_ap6rzrnxmm8k5"   REBUILD  ONLINE
SYS_AI_ap6rzrnxmm8k5 TEST		  ALTER INDEX VISIBLE  ALTER INDEX "MYTEST"."SYS_AI_ap6rzrnxmm8k5"   VISIBLE
--查看测试表上是否创建了索引
select index_name,index_type,tablespace_name,status,auto from dba_indexes where owner='MYTEST' and table_name='TEST';
--eg:
INDEX_NAME	     INDEX_TYPE 		 TABLESPACE_NAME		STATUS	 AUT
-------------------- --------------------------- ------------------------------ -------- ---
SYS_AI_ap6rzrnxmm8k5 NORMAL			 USERS				VALID	 YES
--查看执行计划
set autotrace on exp
select object_name from test where object_id=1234;
```
#### 检查下Automatic Indexing 报告
```
--这里以html格式输出,详细见附件
 set serveroutput on
        declare 
               report clob := null;
        begin
               report := DBMS_AUTO_INDEX.REPORT_ACTIVITY(
                       activity_start => TO_TIMESTAMP('2020-06-08 16:42:12', 'yyyy-mm-ddhh24:mi:ss'),
                       activity_end => TO_TIMESTAMP('2020-06-08 16:43:10', 'yyyy-mm-dd hh24:mi:ss'),
                                 type => 'HTML', 
                             section => 'ALL', 
                                level => 'ALL');
               dbms_output.put_line(report);
end;
/
```

#### 参考
> https://blog.csdn.net/Hehuyi_In/article/details/90481080
> https://blog.csdn.net/enmotech/article/details/87870944
附：html代码输出界面。
<html>
    <head>
	<title>
	  Automatic Index Report
</title>
	<style type="text/css">
	  body, table, input, select,
textarea
	  {font:normal normal 8pt
Verdana,Arial;text-decoration:none;color:#000000;}
	  .s8
{font-size:8pt;color:#006699}
	  .s9 {font-size:10pt;color:#006699}
.s10 {font-size:14pt;color:#006699;}
	  .s16 {border-width : 1px;
border-color : #CCCC99;
	  border-style:
solid;color:#006699;font-size:8pt;}
	  .s17 {border-width : 1px;
border-color : #CCCC99;
	  border-style: solid;font-size:8pt;}
.s27 {border-width : 1px; border-color : #CCCC99; border-style: solid;}

</style>
    </head>
    <body>
	
  
  
	
	
<font class="s10">GENERAL INFORMATION</font>
	
	<hr size="3"
width="550" align="left"/>
	<table class="ex" cellspacing="0"
border="0">
	    <tr>
		<th align="left">Activity
start</th>
		<td>: 08-JUN-2020 16:42:12</td>
	    </tr>
<tr>
		<th align="left">Activity end</th>
		<td>:
08-JUN-2020 16:43:10</td>
	    </tr>
	    <tr>
		<th
align="left">Executions completed</th>
		<td>: 1</td>
</tr>
	    <tr>
		<th align="left">Executions
interrupted</th>
		<td>: 0</td>
	    </tr>
<tr>
		<th align="left">Executions with fatal error</th>
<td>: 0</td>
	    </tr>
	</table>
	<hr size="3" width="550"
align="left"/>

<font
class="s10">SUMMARY (AUTO INDEXES)</font>
	
	<hr size="3"
width="550" align="left"/>
	<table class="ex" cellspacing="0"
border="0">
	    <tr>
		<th align="left">Index
candidates</th>
		<td ora_space_char="_">
      : 
      3</td>
</tr>
	    <tr>
		<th align="left">Indexes created
(visible
	  / invisible)
      </th>
		<td
ora_space_char="_">
      : 
      1
	(1
	  / 
	  0)
</td>
	    </tr>
	    <tr>
		<th align="left">Space
used
	(visible
	  / invisible)
      </th>
		<td
ora_space_char="_">
      : 
      45.09_MB
	(45.09_MB
	  / 
0_B)
      </td>
	    </tr>
	    <tr>
		<th
align="left">Indexes dropped</th>
		<td ora_space_char="_">
: 
      0</td>
	    </tr>
	    <tr>
		<th
align="left">SQL statements verified</th>
		<td
ora_space_char="_">
      : 
      3</td>
	    </tr>
	    <tr>
<th align="left">SQL statements improved
	(improvement factor)
</th>
		<td ora_space_char="_">
      : 
      3
(59085.3x)
      </td>
	    </tr>
	    <tr>
		<th
align="left">SQL plan baselines created</th>
		<td
ora_space_char="_">
      : 
      0</td>
	    </tr>
	    <tr>
<th align="left">Overall improvement factor</th>
		<td
ora_space_char="_">
      : 
      59085.3x</td>
	    </tr>
</table>
	<hr size="3" width="550" align="left"/>

<font class="s10">SUMMARY (MANUAL
INDEXES)</font>
	
	<hr size="3" width="550" align="left"/>
<table class="ex" cellspacing="0" border="0">
	    <tr>
<th align="left">Unused indexes</th>
		<td ora_space_char="_">
: 
      0</td>
	    </tr>
	    <tr>
		<th
align="left">Space used</th>
		<td ora_space_char="_">
      : 
0_B</td>
	    </tr>
	    <tr>
		<th
align="left">Unusable indexes</th>
		<td ora_space_char="_">
: 
      0</td>
	    </tr>
	</table>
	<hr size="3"
width="550" align="left"/>
	
	
  
	
	
	    <font class="s10">INDEX
DETAILS</font>
	
	<hr size="3" width="550" align="left"/>
<font class="s5">  1. The following indexes were created:</font>

*: invisible 
	<hr size="3" width="550" align="left"/>
	<table
bordercolor="#000000" ora_borderstyle="headeronly">
	    <tr>
<th align="left">Owner</th>
		<th align="left">Table</th>
<th align="left">Index</th>
		<th align="left">Key</th>
<th align="left">Type</th>
		<th align="left">Properties</th>
</tr>
	    <tr>
		<td>MYTEST</td>
<td>TEST</td>
		<td>SYS_AI_ap6rzrnxmm8k5</td>
<td>OBJECT_ID</td>
		<td>B-TREE</td>
<td>NONE</td>
	    </tr>
	</table>
	<hr size="3"
width="550" align="left"/>
	
	
  
	
	
	    <font class="s10">VERIFICATION
DETAILS</font>
	
	<hr size="3" width="550" align="left"/>
<font class="s5">  1. The performance of the following statements
improved:</font>
	<hr size="3" width="550" align="left"/>
	<table
class="ex" cellspacing="0" border="0" ora_widthc="80">
	    <tr>
<th align="left">Parsing Schema Name</th>
		<td>: MYTEST</td>
</tr>
	    <tr>
		<th align="left">SQL ID</th>
<td>: 9nd4vtk5wbjbv</td>
	    </tr>
	    <tr>
		<th
align="left">SQL Text</th>
		<td>: select created from test where
object_id=345</td>
	    </tr>
	    <tr>
		<th
align="left">Improvement Factor</th>
		<td>: 44916x</td>
</tr>
	</table>
	
	<font class="s7">
	    <b>
Execution Statistics: </b>
	</font>
	<hr size="1" width="200"
align="left"/>
	<table border="0" ora_widthc="80">
	    <tr>
<td>
		    <font class="s8">
			<b/>
</font>
		</td>
		<td>
<b>Original Plan</b>
		    <hr size="1" width="250"
align="left"/>
		</td>
		<td>
<b>Auto Index Plan</b>
		    <hr size="1" width="250"
align="left"/>
		</td>
	    </tr>
	    <tr>
<td>
		    <b>Elapsed Time (s):</b>
		</td>
<td>225322</td>
		<td>28504</td>
	    </tr>
<tr>
		<td>
		    <b>CPU Time (s):</b>
</td>
		<td>219338</td>
		<td>2013</td>
</tr>
	    <tr>
		<td>
		    <b>Buffer
Gets:</b>
		</td>
		<td>44916</td>
<td>4</td>
	    </tr>
	    <tr>
		<td>
<b>Optimizer Cost:</b>
		</td>
		<td>10360</td>
<td>4</td>
	    </tr>
	    <tr>
		<td>
<b>Disk Reads:</b>
		</td>
		<td>0</td>
<td>2</td>
	    </tr>
	    <tr>
		<td>
<b>Direct Writes:</b>
		</td>
		<td>0</td>
<td>0</td>
	    </tr>
	    <tr>
		<td>
<b>Rows Processed:</b>
		</td>
		<td>1</td>
<td>1</td>
	    </tr>
	    <tr>
		<td>
<b>Executions:</b>
		</td>
		<td>1</td>
<td>1</td>
	    </tr>
	</table>
	
	
	
<font class="s10">
		
		
	PLANS SECTION

</font>
	
	<hr size="3" width="650"
align="left"/>
	
	<font class="s8">
	    <b> -
Original </b>
	</font>
	<hr size="1" width="200" align="left"/>
<table border="0">
	    <tr>
		<th align="left">Plan Hash
Value </th>
		<td>: 
       1357081020</td>
	    </tr>
</table>
	
	<table bordercolor="#000000"
ora_borderstyle="headeronly">
	    <tr>
		<th align="left"
bgcolor="#CCCC99" class="s16">Id</th>
		<th align="left"
bgcolor="#CCCC99" class="s16">Operation</th>
		<th align="left"
bgcolor="#CCCC99" class="s16">Name</th>
		<th align="left"
bgcolor="#CCCC99" class="s16">Rows</th>
		<th align="left"
bgcolor="#CCCC99" class="s16">Bytes</th>
		<th align="left"
bgcolor="#CCCC99" class="s16">Cost</th>
		<th align="left"
bgcolor="#CCCC99" class="s16">Time</th>
	    </tr>
	    <tr
bgcolor="#F7F777" valign="bottom">
		<td class="s27"
align="right">0</td>
		<td class="s27" ora_space_char=".">SELECT
STATEMENT</td>
		<td class="s27"/>
		<td class="s27"
align="right"/>
		<td class="s27" align="right"/>
<td class="s27" align="right">10360</td>
		<td class="s27"
align="right"/>
	    </tr>
	    <tr bgcolor="#F7F777"
valign="bottom">
		<td class="s27" align="right">1</td>
<td class="s27" ora_space_char=".">
		    <font
color="#F7F777">.</font>
		    TABLE ACCESS FULL
</td>
		<td class="s27">TEST</td>
		<td class="s27"
align="right">16</td>
		<td class="s27" align="right">208</td>
<td class="s27" align="right">10360</td>
		<td class="s27"
align="right">00:00:01 </td>
	    </tr>
	</table>

Notes
     
	<hr size="1" width="30" align="left"/>
	
-
	     optimizer_use_stats_on_conventional_dml = 
	     yes

<font class="s8">
	    <b> -
With Auto Indexes </b>
	</font>
	<hr size="1" width="200"
align="left"/>
	<table border="0">
	    <tr>
		<th
align="left">Plan Hash Value </th>
		<td>: 
3677153392</td>
	    </tr>
	</table>
	
	<table
bordercolor="#000000" ora_borderstyle="headeronly">
	    <tr>
<th align="left" bgcolor="#CCCC99" class="s16">Id</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Operation</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Name</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Rows</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Bytes</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Cost</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Time</th>
	    </tr>
<tr bgcolor="#F7F777" valign="bottom">
		<td class="s27"
align="right">0</td>
		<td class="s27" ora_space_char=".">SELECT
STATEMENT</td>
		<td class="s27"/>
		<td class="s27"
align="right">1</td>
		<td class="s27" align="right">13</td>
<td class="s27" align="right">4</td>
		<td class="s27"
align="right">00:00:01 </td>
	    </tr>
	    <tr bgcolor="#F7F777"
valign="bottom">
		<td class="s27" align="right">1</td>
<td class="s27" ora_space_char=".">
		    <font
color="#F7F777">.</font>
		    TABLE ACCESS BY INDEX ROWID
BATCHED
		</td>
		<td class="s27">TEST</td>
<td class="s27" align="right">1</td>
		<td class="s27"
align="right">13</td>
		<td class="s27" align="right">4</td>
<td class="s27" align="right">00:00:01 </td>
	    </tr>
	    <tr
bgcolor="#F7F777" valign="bottom">
		<td class="s27"
align="right"> * 2</td>
		<td class="s27" ora_space_char=".">
<font color="#F7F777">..</font>
		    INDEX RANGE SCAN
</td>
		<td class="s27">SYS_AI_ap6rzrnxmm8k5</td>
<td class="s27" align="right">1</td>
		<td class="s27"
align="right"/>
		<td class="s27" align="right">3</td>
<td class="s27" align="right">00:00:01 </td>
	    </tr>
	</table>

Predicate Information (identified by operation id):
     
<hr size="1" width="290" align="left"/>
	
	    <strong>2 - 
access("OBJECT_ID"=345)
       </strong>
	
	
	Notes

<hr size="1" width="30" align="left"/>
	
	     -
optimizer_use_stats_on_conventional_dml = 
	     yes

- Dynamic sampling used for this statement
	    
( level = 11 )
	    
	
	
	<hr size="3"
width="550" align="left"/>
	<table class="ex" cellspacing="0" border="0"
ora_widthc="80">
	    <tr>
		<th align="left">Parsing
Schema Name</th>
		<td>: MYTEST</td>
	    </tr>
<tr>
		<th align="left">SQL ID</th>
		<td>:
ax5r8mcd7u1w7</td>
	    </tr>
	    <tr>
		<th
align="left">SQL Text</th>
		<td>: select object_type from test
where object_id=123</td>
	    </tr>
	    <tr>
		<th
align="left">Improvement Factor</th>
		<td>: 44916x</td>
</tr>
	</table>
	
	<font class="s7">
	    <b>
Execution Statistics: </b>
	</font>
	<hr size="1" width="200"
align="left"/>
	<table border="0" ora_widthc="80">
	    <tr>
<td>
		    <font class="s8">
			<b/>
</font>
		</td>
		<td>
<b>Original Plan</b>
		    <hr size="1" width="250"
align="left"/>
		</td>
		<td>
<b>Auto Index Plan</b>
		    <hr size="1" width="250"
align="left"/>
		</td>
	    </tr>
	    <tr>
<td>
		    <b>Elapsed Time (s):</b>
		</td>
<td>293346</td>
		<td>232</td>
	    </tr>
	    <tr>
<td>
		    <b>CPU Time (s):</b>
		</td>
<td>291256</td>
		<td>233</td>
	    </tr>
	    <tr>
<td>
		    <b>Buffer Gets:</b>
		</td>
<td>44916</td>
		<td>4</td>
	    </tr>
	    <tr>
<td>
		    <b>Optimizer Cost:</b>
		</td>
<td>10360</td>
		<td>4</td>
	    </tr>
	    <tr>
<td>
		    <b>Disk Reads:</b>
		</td>
<td>0</td>
		<td>0</td>
	    </tr>
	    <tr>
<td>
		    <b>Direct Writes:</b>
		</td>
<td>0</td>
		<td>0</td>
	    </tr>
	    <tr>
<td>
		    <b>Rows Processed:</b>
		</td>
<td>1</td>
		<td>1</td>
	    </tr>
	    <tr>
<td>
		    <b>Executions:</b>
		</td>
<td>1</td>
		<td>1</td>
	    </tr>
	</table>

PLANS SECTION
      
	    </font>

<hr size="3" width="650" align="left"/>
	
	<font
class="s8">
	    <b> - Original </b>
	</font>
	<hr size="1"
width="200" align="left"/>
	<table border="0">
	    <tr>
<th align="left">Plan Hash Value </th>
		<td>: 
1357081020</td>
	    </tr>
	</table>
	
	<table
bordercolor="#000000" ora_borderstyle="headeronly">
	    <tr>
<th align="left" bgcolor="#CCCC99" class="s16">Id</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Operation</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Name</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Rows</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Bytes</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Cost</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Time</th>
	    </tr>
<tr bgcolor="#F7F777" valign="bottom">
		<td class="s27"
align="right">0</td>
		<td class="s27" ora_space_char=".">SELECT
STATEMENT</td>
		<td class="s27"/>
		<td class="s27"
align="right"/>
		<td class="s27" align="right"/>
<td class="s27" align="right">10360</td>
		<td class="s27"
align="right"/>
	    </tr>
	    <tr bgcolor="#F7F777"
valign="bottom">
		<td class="s27" align="right">1</td>
<td class="s27" ora_space_char=".">
		    <font
color="#F7F777">.</font>
		    TABLE ACCESS FULL
</td>
		<td class="s27">TEST</td>
		<td class="s27"
align="right">16</td>
		<td class="s27" align="right">240</td>
<td class="s27" align="right">10360</td>
		<td class="s27"
align="right">00:00:01 </td>
	    </tr>
	</table>

Notes
     
	<hr size="1" width="30" align="left"/>
	
-
	     optimizer_use_stats_on_conventional_dml = 
	     yes

<font class="s8">
	    <b> -
With Auto Indexes </b>
	</font>
	<hr size="1" width="200"
align="left"/>
	<table border="0">
	    <tr>
		<th
align="left">Plan Hash Value </th>
		<td>: 
3677153392</td>
	    </tr>
	</table>
	
	<table
bordercolor="#000000" ora_borderstyle="headeronly">
	    <tr>
<th align="left" bgcolor="#CCCC99" class="s16">Id</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Operation</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Name</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Rows</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Bytes</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Cost</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Time</th>
	    </tr>
<tr bgcolor="#F7F777" valign="bottom">
		<td class="s27"
align="right">0</td>
		<td class="s27" ora_space_char=".">SELECT
STATEMENT</td>
		<td class="s27"/>
		<td class="s27"
align="right">2</td>
		<td class="s27" align="right">30</td>
<td class="s27" align="right">4</td>
		<td class="s27"
align="right">00:00:01 </td>
	    </tr>
	    <tr bgcolor="#F7F777"
valign="bottom">
		<td class="s27" align="right">1</td>
<td class="s27" ora_space_char=".">
		    <font
color="#F7F777">.</font>
		    TABLE ACCESS BY INDEX ROWID
BATCHED
		</td>
		<td class="s27">TEST</td>
<td class="s27" align="right">2</td>
		<td class="s27"
align="right">30</td>
		<td class="s27" align="right">4</td>
<td class="s27" align="right">00:00:01 </td>
	    </tr>
	    <tr
bgcolor="#F7F777" valign="bottom">
		<td class="s27"
align="right"> * 2</td>
		<td class="s27" ora_space_char=".">
<font color="#F7F777">..</font>
		    INDEX RANGE SCAN
</td>
		<td class="s27">SYS_AI_ap6rzrnxmm8k5</td>
<td class="s27" align="right">1</td>
		<td class="s27"
align="right"/>
		<td class="s27" align="right">3</td>
<td class="s27" align="right">00:00:01 </td>
	    </tr>
	</table>

Predicate Information (identified by operation id):
     
<hr size="1" width="290" align="left"/>
	
	    <strong>2 - 
access("OBJECT_ID"=123)
       </strong>
	
	
	Notes

<hr size="1" width="30" align="left"/>
	
	     -
optimizer_use_stats_on_conventional_dml = 
	     yes

- Dynamic sampling used for this statement
	    
( level = 11 )
	    
	
	
	<hr size="3"
width="550" align="left"/>
	<table class="ex" cellspacing="0" border="0"
ora_widthc="80">
	    <tr>
		<th align="left">Parsing
Schema Name</th>
		<td>: MYTEST</td>
	    </tr>
<tr>
		<th align="left">SQL ID</th>
		<td>:
csv9p5vfq6kt1</td>
	    </tr>
	    <tr>
		<th
align="left">SQL Text</th>
		<td>: select object_name from test
where object_id=1</td>
	    </tr>
	    <tr>
		<th
align="left">Improvement Factor</th>
		<td>: 87424x</td>
</tr>
	</table>
	
	<font class="s7">
	    <b>
Execution Statistics: </b>
	</font>
	<hr size="1" width="200"
align="left"/>
	<table border="0" ora_widthc="80">
	    <tr>
<td>
		    <font class="s8">
			<b/>
</font>
		</td>
		<td>
<b>Original Plan</b>
		    <hr size="1" width="250"
align="left"/>
		</td>
		<td>
<b>Auto Index Plan</b>
		    <hr size="1" width="250"
align="left"/>
		</td>
	    </tr>
	    <tr>
<td>
		    <b>Elapsed Time (s):</b>
		</td>
<td>3981732</td>
		<td>377</td>
	    </tr>
<tr>
		<td>
		    <b>CPU Time (s):</b>
</td>
		<td>984250</td>
		<td>376</td>
</tr>
	    <tr>
		<td>
		    <b>Buffer
Gets:</b>
		</td>
		<td>87424</td>
<td>4</td>
	    </tr>
	    <tr>
		<td>
<b>Optimizer Cost:</b>
		</td>
		<td>10360</td>
<td>4</td>
	    </tr>
	    <tr>
		<td>
<b>Disk Reads:</b>
		</td>
		<td>9066</td>
<td>0</td>
	    </tr>
	    <tr>
		<td>
<b>Direct Writes:</b>
		</td>
		<td>0</td>
<td>0</td>
	    </tr>
	    <tr>
		<td>
<b>Rows Processed:</b>
		</td>
		<td>1</td>
<td>1</td>
	    </tr>
	    <tr>
		<td>
<b>Executions:</b>
		</td>
		<td>1</td>
<td>1</td>
	    </tr>
	</table>
	
	
	
<font class="s10">
		
		
	PLANS SECTION

</font>
	
	<hr size="3" width="650"
align="left"/>
	
	<font class="s8">
	    <b> -
Original </b>
	</font>
	<hr size="1" width="200" align="left"/>
<table border="0">
	    <tr>
		<th align="left">Plan Hash
Value </th>
		<td>: 
       1357081020</td>
	    </tr>
</table>
	
	<table bordercolor="#000000"
ora_borderstyle="headeronly">
	    <tr>
		<th align="left"
bgcolor="#CCCC99" class="s16">Id</th>
		<th align="left"
bgcolor="#CCCC99" class="s16">Operation</th>
		<th align="left"
bgcolor="#CCCC99" class="s16">Name</th>
		<th align="left"
bgcolor="#CCCC99" class="s16">Rows</th>
		<th align="left"
bgcolor="#CCCC99" class="s16">Bytes</th>
		<th align="left"
bgcolor="#CCCC99" class="s16">Cost</th>
		<th align="left"
bgcolor="#CCCC99" class="s16">Time</th>
	    </tr>
	    <tr
bgcolor="#F7F777" valign="bottom">
		<td class="s27"
align="right">0</td>
		<td class="s27" ora_space_char=".">SELECT
STATEMENT</td>
		<td class="s27"/>
		<td class="s27"
align="right"/>
		<td class="s27" align="right"/>
<td class="s27" align="right">10360</td>
		<td class="s27"
align="right"/>
	    </tr>
	    <tr bgcolor="#F7F777"
valign="bottom">
		<td class="s27" align="right">1</td>
<td class="s27" ora_space_char=".">
		    <font
color="#F7F777">.</font>
		    TABLE ACCESS FULL
</td>
		<td class="s27">TEST</td>
		<td class="s27"
align="right">16</td>
		<td class="s27" align="right">640</td>
<td class="s27" align="right">10360</td>
		<td class="s27"
align="right">00:00:01 </td>
	    </tr>
	</table>

Notes
     
	<hr size="1" width="30" align="left"/>
	
-
	     optimizer_use_stats_on_conventional_dml = 
	     yes

<font class="s8">
	    <b> -
With Auto Indexes </b>
	</font>
	<hr size="1" width="200"
align="left"/>
	<table border="0">
	    <tr>
		<th
align="left">Plan Hash Value </th>
		<td>: 
3677153392</td>
	    </tr>
	</table>
	
	<table
bordercolor="#000000" ora_borderstyle="headeronly">
	    <tr>
<th align="left" bgcolor="#CCCC99" class="s16">Id</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Operation</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Name</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Rows</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Bytes</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Cost</th>
		<th
align="left" bgcolor="#CCCC99" class="s16">Time</th>
	    </tr>
<tr bgcolor="#F7F777" valign="bottom">
		<td class="s27"
align="right">0</td>
		<td class="s27" ora_space_char=".">SELECT
STATEMENT</td>
		<td class="s27"/>
		<td class="s27"
align="right">2</td>
		<td class="s27" align="right">80</td>
<td class="s27" align="right">4</td>
		<td class="s27"
align="right">00:00:01 </td>
	    </tr>
	    <tr bgcolor="#F7F777"
valign="bottom">
		<td class="s27" align="right">1</td>
<td class="s27" ora_space_char=".">
		    <font
color="#F7F777">.</font>
		    TABLE ACCESS BY INDEX ROWID
BATCHED
		</td>
		<td class="s27">TEST</td>
<td class="s27" align="right">2</td>
		<td class="s27"
align="right">80</td>
		<td class="s27" align="right">4</td>
<td class="s27" align="right">00:00:01 </td>
	    </tr>
	    <tr
bgcolor="#F7F777" valign="bottom">
		<td class="s27"
align="right"> * 2</td>
		<td class="s27" ora_space_char=".">
<font color="#F7F777">..</font>
		    INDEX RANGE SCAN
</td>
		<td class="s27">SYS_AI_ap6rzrnxmm8k5</td>
<td class="s27" align="right">1</td>
		<td class="s27"
align="right"/>
		<td class="s27" align="right">3</td>
<td class="s27" align="right">00:00:01 </td>
	    </tr>
	</table>

Predicate Information (identified by operation id):
     
<hr size="1" width="290" align="left"/>
	
	    <strong>2 - 
access("OBJECT_ID"=1)
       </strong>
	
	
	Notes

<hr size="1" width="30" align="left"/>
	
	     -
optimizer_use_stats_on_conventional_dml = 
	     yes

- Dynamic sampling used for this statement
	    
( level = 11 )
	    
	
	
	<hr size="3"
width="550" align="left"/>
	<hr size="3" width="550" align="left"/>

<font class="s10">ERRORS</font>

<hr size="3" width="650" align="left"/>
	<tr>No errors
found.</tr>
	<hr size="3" width="650" align="left"/>