我正在尝试使用SQuirreL SQL 3.6获取Oracle(11)的执行计划。
我可以看到"解释计划" "结果"旁边的标签选项卡,但它总是空的。
当我第一次点击它时,我得到了一个对话框,要求创建PLAN_TABLE
,但是在"解释计划"标签保持空白。
我尝试在查询之前添加explain plan for
,但这给了我一个Error: ORA-00905: missing keyword
答案 0 :(得分:1)
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'));
您可以通过查询获得完整的执行计划。
PLAN_TABLE
必须存在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]