explain plan for
SELECT * FROM schema2.mv_a_data mv
WHERE mv.routing_code_type_id = 3
AND mv.static_data_status_id IN(5, 8)
AND mv.acct_currency_ind_id NOT IN
(SELECT DISTINCT te.acct_currency_ind_id
FROM schema1.tem_ele te
WHERE te.lis_tem_id IN
(SELECT lis_tem_id
FROM schema1.lis_tem
WHERE lis_tem.template_type_id = 2
AND lis_tem.deleted_flag = 'N' )
AND te.acct_currency_ind_id IS NOT NULL
)
ORDER BY mv.treasury_region_code,
mv.legal_entity_mnemonic,
mv.currency_code;
select *
from TABLE(DBMS_XPLAN.DISPLAY('PLAN_TABLE', null,'ADVANCED'));
------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 892 | 318K| 69 (2)| 00:00:01 |
| 1 | SORT ORDER BY | | 892 | 318K| 69 (2)| 00:00:01 |
|* 2 | HASH JOIN RIGHT ANTI | | 892 | 318K| 68 (0)| 00:00:01 | `
| 3 | VIEW | VW_NSO_1 | 1457 | 8742 | 11 (0) | 00:00:01 |
|* 4 | HASH JOIN | | 1457 | 33511 | 11 (0)| 00:00:01 |
|* 5 | TABLE ACCESS FULL | lis_tem | 100 | 1100 | 3 (0)| 00:00:01 |
|* 6 | TABLE ACCESS FULL | tem_ele | 3271 | 39252 | 8 (0)| 00:00:01 |
|* 7 | MAT_VIEW ACCESS FULL| mv_a_data | 2348 | 825K| 57 (0)| 00:00:01 |
我想读给定的解释计划。根据我的理解,在查看解释计划并根据 ,首先完成LIS_TEM表和TEM_ELE的FTS,然后使用HASH JOIN连接它们。阅读甲骨文解释计划
问题1 - 我可以将此HASH JOIN更改为NESTED LOOP吗?
我只是问学习的目的。我知道HASH JOIN在这里很好。 哈希连接后,我想它会去ID3,即查看VW_NSO_1和ID7 MAT_VIEW。
问题2 - 什么是VIEW VW_NSO_1,SQL查询的哪个子句负责将它带到这里?
问题3 - 我将如何阅读计划的其余部分?
问题4 - 为什么HASH JOIN RIGHT ANTI进来?
请帮助我详细了解上述解释计划。谢谢,让我知道你是否需要任何进一步的细节。
你或某人请回答问题2,3和4? –