Question

我不是Oracle的专家刚开始工作。当我执行以下查询时，它以|（管道）格式输出。我希望在EXPLAIN PLAN或tabluar或json中输出xml等等...是否可能？

EXPLAIN PLAN FOR SELECT * FROM user_master;
SELECT plan_table_output FROM TABLE(DBMS_XPLAN.DISPLAY('plan_table'));

Output:

    Plan hash value: 3060894046

    ---------------------------------------------------------------------------------
    | Id  | Operation         | Name        | Rows  | Bytes | Cost (%CPU)| Time     |
    ---------------------------------------------------------------------------------
    |   0 | SELECT STATEMENT  |             |     1 |    94 |     2   (0)| 00:00:01 |
    |   1 |  TABLE ACCESS FULL| USER_MASTER |     1 |    94 |     2   (0)| 00:00:01 |
    ---------------------------------------------------------------------------------

Answer 1

如果直接访问PLAN_TABLE，您可以以表格格式获取它：

select plan_id,
       operation,
       options,
       cost,
       cpu_cost,
       io_cost,
       temp_space,
       access_predicates,
       bytes,
       object_name,
       object_alias,
       optimizer,
       object_type
from plan_table
start with parent_id is null
connect by prior id = parent_id;

由于plan_table可以包含不同的计划，因此使用显式语句ID可能更好：

explain plan 
  set statement_id = 'foo'
for
select ...;

然后在plan_table上的select中使用它：

select ....
from plan_table
start with parent_id is null and statement_id = 'foo'
connect by prior id = parent_id;

要将此作为XML使用，您可以使用：

select dbms_xplan.display_plan(type => 'xml')
FROM dual

在Oracle中解释计划输出

1 个答案: