确认数据库中已经存在表PLAN_TABLE，否则需要执行utlxplan.sql

点击(此处)折叠或打开

explain plan
set statement_id = 'BOM1' for
select id
from bom
where id = 100101111;

然后用以下命令查询最近一个执行计划

点击(此处)折叠或打开

Select *
from table (dbms_xplan.display);

Plan hash value: 4118430342

-----------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-----------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 26 | 3 (0)| 00:00:01 |
| 1 | TABLE ACCESS BY INDEX ROWID| BOM | 1 | 26 | 3 (0)| 00:00:01 |
|* 2 | INDEX UNIQUE SCAN | BOM_PK_ID | 1 | | 2 (0)| 00:00:01 |
-----------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

2 - access("ID"=100102111)

读取执行计划的顺序通常是从内到外，从下到上。

使用EXPLAIN PLAN来查看执行计划