Oracle查询。
以下查询需要一些时间才能执行：
SELECT GCCOM_ACCOUNT_CONTRACT.ID_ACCOUNT_CONTRACT
FROM GCCOM_ACCOUNT_CONTRACT, GCCOM_ACCOUNT_GROUP
WHERE
GCCOM_ACCOUNT_CONTRACT.ID_ACCOUNT_GROUP = GCCOM_ACCOUNT_GROUP.ID_ACCOUNT_GROUP (+) AND
EXISTS (SELECT 1 FROM GCCOM_CONTRACTED_SERVICE
WHERE ID_ACCOUNT_CONTRACT = GCCOM_ACCOUNT_CONTRACT.ID_ACCOUNT_CONTRACT AND
STATUS = 'ESTSC00002' AND
DROP_DATE IS NULL ) AND
EXISTS (SELECT 1 FROM GCCOM_SEND_SERVICE
WHERE (ID_ACCOUNT_CONTRACT = GCCOM_ACCOUNT_CONTRACT.ID_ACCOUNT_CONTRACT OR
ID_ACCOUNT_GROUP = GCCOM_ACCOUNT_GROUP.ID_ACCOUNT_GROUP)
) AND
(( GCCOM_ACCOUNT_CONTRACT.ACCOUNT_CODE between 200000001 AND 900468243))
ORDER BY
GCCOM_ACCOUNT_CONTRACT.ID_COMPANY,
GCCOM_ACCOUNT_GROUP.ID_ACCOUNT_GROUP,
GCCOM_ACCOUNT_CONTRACT.ACCOUNT_CODE
解释计划如下：
PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------------------------------------------------------------------
Plan hash value: 391653930
------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time | Pstart| Pstop |
------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 45 | | 570K (1)| 01:54:06 | | |
| 1 | SORT ORDER BY | | 1 | 45 | 12M| 570K (1)| 01:54:06 | | |
|* 2 | FILTER | | | | | | | | |
| 3 | NESTED LOOPS OUTER | | 255K| 10M| | 17381 (1)| 00:03:29 | | |
|* 4 | HASH JOIN RIGHT SEMI | | 255K| 9979K| 8648K| 17380 (1)| 00:03:29 | | |
| 5 | PARTITION HASH ALL | | 260K| 5592K| | 7175 (1)| 00:01:27 | 1 | 16 |
|* 6 | TABLE ACCESS FULL | GCCOM_CONTRACTED_SERVICE | 260K| 5592K| | 7175 (1)| 00:01:27 | 1 | 16 |
|* 7 | TABLE ACCESS FULL | GCCOM_ACCOUNT_CONTRACT | 810K| 13M| | 8627 (1)| 00:01:44 | | |
|* 8 | INDEX UNIQUE SCAN | PK_GCCOM_ACCOUNT_GROUP | 1 | 5 | | 1 (0)| 00:00:01 | | |
| 9 | CONCATENATION | | | | | | | | |
| 10 | TABLE ACCESS BY GLOBAL INDEX ROWID| GCCOM_SEND_SERVICE | 1 | 7 | | 1 (0)| 00:00:01 | ROWID | ROWID |
|* 11 | INDEX RANGE SCAN | IDX_GCCOMSENDSERVICE_27 | 1 | | | 1 (0)| 00:00:01 | | |
|* 12 | TABLE ACCESS BY GLOBAL INDEX ROWID| GCCOM_SEND_SERVICE | 2 | 14 | | 1 (0)| 00:00:01 | ROWID | ROWID |
|* 13 | INDEX RANGE SCAN | IDX_GCCOMSENDSERVICE_04 | 1 | | | 1 (0)| 00:00:01 | | |
------------------------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------------------------------------------------------------------
---------------------------------------------------
2 - filter( EXISTS (SELECT 0 FROM "GCCOM_SEND_SERVICE" "GCCOM_SEND_SERVICE"<not feasible>)
4 - access("ID_ACCOUNT_CONTRACT"="GCCOM_ACCOUNT_CONTRACT"."ID_ACCOUNT_CONTRACT")
6 - filter("DROP_DATE" IS NULL AND "STATUS"='ESTSC00002')
7 - filter("GCCOM_ACCOUNT_CONTRACT"."ACCOUNT_CODE">=200000001 AND "GCCOM_ACCOUNT_CONTRACT"."ACCOUNT_CODE"<=900468243)
8 - access("GCCOM_ACCOUNT_CONTRACT"."ID_ACCOUNT_GROUP"="GCCOM_ACCOUNT_GROUP"."ID_ACCOUNT_GROUP"(+))
11 - access("ID_ACCOUNT_CONTRACT"=:B1)
12 - filter(LNNVL("ID_ACCOUNT_CONTRACT"=:B1))
13 - access("ID_ACCOUNT_GROUP"=:B1)
32 filas seleccionadas.
表格的平均基数如下：
select count(*) from GCCOM_ACCOUNT_CONTRACT >> rows: 810412
select avg(distinct ID_ACCOUNT_GROUP) from GCCOM_ACCOUNT_CONTRACT >> cardinality: 87173
高度索引。
尝试了许多事情，但没用。
有什么想法吗？