每个单独的查询执行时间不到10秒。
但是当我将这些查询加在一起时，通过使用IN关键字和列表，优化程序会创建一个奇怪的解释计划，并且查询需要很长时间（想想小时）。
我已经包含了以下查询。 我是否必须强制进行某种索引？
查询1：
select row_number() over (partition by t1.COLUMN_1, t1.COLUMN_2, t1.COLUMN_3 order by t1.RSLT_DT desc) rn,
t1.COLUMN_1,
t1.RSLT_DT,
t1.COLUMN_2,
t1.COLUMN_3,
t1.MY_SCORE
from MY_DB.MY_TABLE t1
where t1.COLUMN_3 in ('FACT_1','FACT_0')
and t1.COLUMN_1
in ('33162046')
and MY_SCORE > 0;
Plan hash value: 3324896092
------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time | Pstart| Pstop |
------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 70545 | 4202K| | 7545K (40)| 37:43:34 | | |
| 1 | WINDOW SORT | | 70545 | 4202K| 5312K| 7545K (40)| 37:43:34 | | |
| 2 | PARTITION RANGE ALL | | 70545 | 4202K| | 7544K (40)| 37:43:26 | 1 |1048575|
|* 3 | TABLE ACCESS BY LOCAL INDEX ROWID| MY_TABLE | 70545 | 4202K| | 7544K (40)| 37:43:26 | 1 |1048575|
| 4 | BITMAP CONVERSION TO ROWIDS | | | | | | | | |
| 5 | BITMAP AND | | | | | | | | |
| 6 | BITMAP OR | | | | | | | | |
|* 7 | BITMAP INDEX SINGLE VALUE | MY_TABLE_X27 | | | | | | 1 |1048575|
|* 8 | BITMAP INDEX SINGLE VALUE | MY_TABLE_X27 | | | | | | 1 |1048575|
| 9 | BITMAP MERGE | | | | | | | | |
|* 10 | BITMAP INDEX RANGE SCAN | MY_TABLE_X21 | | | | | | 1 |1048575|
------------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - filter("MY_SCORE">0)
7 - access("T1"."COLUMN_3"='FACT_0')
8 - access("T1"."COLUMN_3"='FACT_1')
10 - access("T1"."COLUMN_1"=33162046)
filter("T1"."COLUMN_1"=33162046)
查询2：
select row_number() over (partition by t1.COLUMN_1, t1.COLUMN_2, t1.COLUMN_3 order by t1.RSLT_DT desc) rn,
t1.COLUMN_1,
t1.RSLT_DT,
t1.COLUMN_2,
t1.COLUMN_3,
t1.MY_SCORE
from MY_DB.MY_TABLE t1
where t1.COLUMN_3 in ('FACT_1','FACT_0')
and t1.COLUMN_1
in ('33162047')
and MY_SCORE > 0;
Plan hash value: 3324896092
------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time | Pstart| Pstop |
------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 70545 | 4202K| | 7545K (40)| 37:43:34 | | |
| 1 | WINDOW SORT | | 70545 | 4202K| 5312K| 7545K (40)| 37:43:34 | | |
| 2 | PARTITION RANGE ALL | | 70545 | 4202K| | 7544K (40)| 37:43:26 | 1 |1048575|
|* 3 | TABLE ACCESS BY LOCAL INDEX ROWID| MY_TABLE | 70545 | 4202K| | 7544K (40)| 37:43:26 | 1 |1048575|
| 4 | BITMAP CONVERSION TO ROWIDS | | | | | | | | |
| 5 | BITMAP AND | | | | | | | | |
| 6 | BITMAP OR | | | | | | | | |
|* 7 | BITMAP INDEX SINGLE VALUE | MY_TABLE_X27 | | | | | | 1 |1048575|
|* 8 | BITMAP INDEX SINGLE VALUE | MY_TABLE_X27 | | | | | | 1 |1048575|
| 9 | BITMAP MERGE | | | | | | | | |
|* 10 | BITMAP INDEX RANGE SCAN | MY_TABLE_X21 | | | | | | 1 |1048575|
------------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - filter("MY_SCORE">0)
7 - access("T1"."COLUMN_3"='FACT_0')
8 - access("T1"."COLUMN_3"='FACT_1')
10 - access("T1"."COLUMN_1"=33162047)
filter("T1"."COLUMN_1"=33162047)
加入查询：
select row_number() over (partition by t1.COLUMN_1, t1.COLUMN_2, t1.COLUMN_3 order by t1.RSLT_DT desc) rn,
t1.COLUMN_1,
t1.RSLT_DT,
t1.COLUMN_2,
t1.COLUMN_3,
t1.MY_SCORE
from MY_DB.MY_TABLE t1
where t1.COLUMN_3 in ('FACT_1','FACT_0')
and t1.COLUMN_1
in ('33162046','33162047')
and MY_SCORE > 0;
Plan hash value: 2547923189
-------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time | Pstart| Pstop |
-------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 70545 | 4202K| | 11M (1)| 59:28:46 | | |
| 1 | WINDOW SORT | | 70545 | 4202K| 5312K| 11M (1)| 59:28:46 | | |
| 2 | PARTITION RANGE ALL | | 70545 | 4202K| | 11M (1)| 59:28:38 | 1 |1048575|
| 3 | INLIST ITERATOR | | | | | | | | |
|* 4 | TABLE ACCESS BY LOCAL INDEX ROWID| MY_TABLE | 70545 | 4202K| | 11M (1)| 59:28:38 | 1 |1048575|
| 5 | BITMAP CONVERSION TO ROWIDS | | | | | | | | |
|* 6 | BITMAP INDEX SINGLE VALUE | MY_TABLE_X27 | | | | | | 1 |1048575|
-------------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
4 - filter(("T1"."COLUMN_1"=33162046 OR "T1"."COLUMN_1"=33162047) AND "MY_SCORE">0)
6 - access("T1"."COLUMN_3"='FACT_0' OR "T1"."COLUMN_3"='FACT_1')