我如何在SquirrelSQL中看到Oracle执行计划?

独立于SQL客户端的简单方法:

EXPLAIN PLAN  SET STATEMENT_ID = 'yourTag' into   plan_table  FOR
select .... your query here ... from tab;
---    
SELECT * FROM table(DBMS_XPLAN.DISPLAY('plan_table', 'yourTag','ALL'));

您将得到作为查询结果的完整执行计划。 这个 PLAN_TABLE 必须存在,并且必须授予您的用户读写权限。

查询的示例输出

select * from dual where dummy = 'X';



Plan hash value: 272002086

----------------------------------------------------------------------------------
| Id  | Operation                 | Name | Rows  | Bytes | Cost (%CPU)| Time     |
----------------------------------------------------------------------------------
|   0 | SELECT STATEMENT          |      |     1 |     2 |     2   (0)| 00:00:01 |
|*  1 |  TABLE ACCESS STORAGE FULL| DUAL |     1 |     2 |     2   (0)| 00:00:01 |
----------------------------------------------------------------------------------

Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------

   1 - SEL$1 / DUAL@SEL$1

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

   1 - storage("DUMMY"='X')
       filter("DUMMY"='X')

Column Projection Information (identified by operation id):
-----------------------------------------------------------

   1 - "DUMMY"[VARCHAR2,1]