dbms_xplan的调用的语法类似: select * from table(dbms_xplan.display(format=>''''BASIC'''')) 使用 TABLE() 操作符，或者 CAST 操作。
具体用法可以参考Oracle官方文档。
实际上从Oracle9i开始我们就经常使用如下方式调用dbms_xplan:
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
SQL> explain plan for
2 select count(*) from dual;
Explained.
SQL> @?/rdbms/admin/utlxplp;
PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------
--------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost |
--------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | |
| 1 | SORT AGGREGATE | | | | |
| 2 | TABLE ACCESS FULL | DUAL | | | |
--------------------------------------------------------------------
Note: rule based optimization
10 rows selected.
utlxplp.sql脚本中正是调用了dbms_xplan:
SQL> get ?/rdbms/admin/utlxplp;
1 Rem
2 Rem $Header: utlxplp.sql 23-jan-2002.08:55:23 bdagevil Exp $
3 Rem
4 Rem utlxplp.sql
5 Rem
6 Rem Copyright (c) 1998, 2002, Oracle Corporation. All rights reserved.
7 Rem
8 Rem NAME
9 Rem utlxplp.sql - UTiLity eXPLain Parallel plans
10 Rem
11 Rem DESCRIPTION
12 Rem script utility to display the explain plan of the last explain plan
13 Rem command. Display also Parallel Query information if the plan happens to
14 Rem run parallel
15 Rem
16 Rem NOTES
17 Rem Assume that the table PLAN_TABLE has been created. The script
18 Rem utlxplan.sql should be used to create that table
19 Rem
20 Rem With SQL*plus, it is recomended to set linesize and pagesize before
21 Rem running this script. For example:
22 Rem set linesize 130
23 Rem set pagesize 0
24 Rem
25 Rem MODIFIED (MM/DD/YY)
26 Rem bdagevil 01/23/02 - rewrite with new dbms_xplan package
27 Rem bdagevil 04/05/01 - include CPU cost
28 Rem bdagevil 02/27/01 - increase Name column
29 Rem jihuang 06/14/00 - change order by to order siblings by.
30 Rem jihuang 05/10/00 - include plan info for recursive SQL in LE row source
31 Rem bdagevil 01/05/00 - make deterministic with order-by
32 Rem bdagevil 05/07/98 - Explain plan script for parallel plans
33 Rem bdagevil 05/07/98 - Created
34 Rem
35 set markup html preformat on
36 Rem
37 Rem Use the display table function from the dbms_xplan package to display the last
38 Rem explain plan. Use default mode which will display only relevant information
39 Rem
40* select * from table(dbms_xplan.display());
41
SQL>
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