我想在6列的所有可能组合中聚合table1中的数据。 Table1中有60万行。查询运行了一个多小时，仍然没有提取任何数据。需要一些帮助来调整这个
select /*+ parallel(a,8)*/
event_date,
a.COL1,
COL2,
COL3,
COL4,
COL5,
COL6,
count (distinct id) base_count,
count (distinct case when active_flg = 'Y' then id end) unique_active_cnt,
count (case when active_flg = 'Y' then id end) active_cnt,
GROUPING_ID (a.COL1,
COL2,
COL3,
COL4,
COL5,
COL6)
AS grp_id
from table1 partition (P2017_01) a
group by event_date,
cube (a.COL1,
COL2,
COL3,
COL4,
COL5,
COL6);
解释上述sql的计划： -
解释完整。
PLAN_TABLE_OUTPUT
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Plan hash value: 3317440810
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| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time | Pstart| Pstop | TQ |IN-OUT| PQ Distrib |
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| 0 | SELECT STATEMENT | | 392K| 81M| | 96682 (4)| 00:00:08 | | | | | |
| 1 | TEMP TABLE TRANSFORMATION | | | | | | | | | | | |
| 2 | PX COORDINATOR | | | | | | | | | | | |
| 3 | PX SEND QC (RANDOM) | :TQ10001 | 392K| 20M| | 1157 (5)| 00:00:01 | | | Q1,01 | P->S | QC (RAND) |
| 4 | LOAD AS SELECT (TEMP SEGMENT MERGE)| SYS_TEMP_0FDA4B738_9AA210CA | | | | | | | | Q1,01 | PCWP | |
| 5 | SORT GROUP BY ROLLUP | | 392K| 20M| 293M| 1157 (5)| 00:00:01 | | | Q1,01 | PCWP | |
| 6 | PX RECEIVE | | 4040K| 208M| | 1121 (2)| 00:00:01 | | | Q1,01 | PCWP | |
| 7 | PX SEND HASH | :TQ10000 | 4040K| 208M| | 1121 (2)| 00:00:01 | | | Q1,00 | P->P | HASH |
| 8 | PX BLOCK ITERATOR | | 4040K| 208M| | 1121 (2)| 00:00:01 | 25 | 25 | Q1,00 | PCWC | |
| 9 | TABLE ACCESS FULL | TABLE1 | 4040K| 208M| | 1121 (2)| 00:00:01 | 25 | 25 | Q1,00 | PCWP | |
| 10 | LOAD AS SELECT | SYS_TEMP_0FDA4B738_9AA210CA | | | | | | | | | | |
| 11 | PARTITION RANGE SINGLE | | 185K| 9224K| | 27366 (2)| 00:00:03 | 25 | 25 | | | |
| 12 | SORT GROUP BY ROLLUP | | 185K| 9224K| 278M| 27366 (2)| 00:00:03 | | | | | |
| 13 | TABLE ACCESS FULL | TABLE1 | 4040K| 196M| | 8081 (2)| 00:00:01 | 25 | 25 | | | |
| 14 | LOAD AS SELECT | SYS_TEMP_0FDA4B738_9AA210CA | | | | | | | | | | |
| 15 | PARTITION RANGE SINGLE | | 32686 | 1595K| | 26191 (2)| 00:00:03 | 25 | 25 | | | |
| 16 | SORT GROUP BY ROLLUP | | 32686 | 1595K| 278M| 26191 (2)| 00:00:03 | | | | | |
| 17 | TABLE ACCESS FULL | TABLE1 | 4040K| 192M| | 8081 (2)| 00:00:01 | 25 | 25 | | | |
| 18 | LOAD AS SELECT | SYS_TEMP_0FDA4B738_9AA210CA | | | | | | | | | | |
| 19 | PARTITION RANGE SINGLE | | 73 | 2336 | | 8374 (5)| 00:00:01 | 25 | 25 | | | |
| 20 | SORT GROUP BY ROLLUP | | 73 | 2336 | | 8374 (5)| 00:00:01 | | | | | |
| 21 | TABLE ACCESS FULL | TABLE1 | 4040K| 123M| | 8081 (2)| 00:00:01 | 25 | 25 | | | |
| 22 | LOAD AS SELECT | SYS_TEMP_0FDA4B738_9AA210CA | | | | | | | | | | |
| 23 | PARTITION RANGE SINGLE | | 15408 | 707K| | 8374 (5)| 00:00:01 | 25 | 25 | | | |
| 24 | SORT GROUP BY ROLLUP | | 15408 | 707K| | 8374 (5)| 00:00:01 | | | | | |
| 25 | TABLE ACCESS FULL | TABLE1 | 4040K| 181M| | 8081 (2)| 00:00:01 | 25 | 25 | | | |
| 26 | LOAD AS SELECT | SYS_TEMP_0FDA4B738_9AA210CA | | | | | | | | | | |
| 27 | PARTITION RANGE SINGLE | | 34 | 986 | | 8374 (5)| 00:00:01 | 25 | 25 | | | |
| 28 | SORT GROUP BY ROLLUP | | 34 | 986 | | 8374 (5)| 00:00:01 | | | | | |
| 29 | TABLE ACCESS FULL | TABLE1 | 4040K| 111M| | 8081 (2)| 00:00:01 | 25 | 25 | | | |
| 30 | LOAD AS SELECT | SYS_TEMP_0FDA4B738_9AA210CA | | | | | | | | | | |
| 31 | PARTITION RANGE SINGLE | | 6 | 168 | | 8374 (5)| 00:00:01 | 25 | 25 | | | |
| 32 | SORT GROUP BY ROLLUP | | 6 | 168 | | 8374 (5)| 00:00:01 | | | | | |
| 33 | TABLE ACCESS FULL | TABLE1 | 4040K| 107M| | 8081 (2)| 00:00:01 | 25 | 25 | | | |
| 34 | LOAD AS SELECT | SYS_TEMP_0FDA4B738_9AA210CA | | | | | | | | | | |
| 35 | PARTITION RANGE SINGLE | | 3 | 75 | | 8374 (5)| 00:00:01 | 25 | 25 | | | |
| 36 | SORT GROUP BY ROLLUP | | 3 | 75 | | 8374 (5)| 00:00:01 | | | | | |
| 37 | TABLE ACCESS FULL | TABLE1 | 4040K| 96M| | 8081 (2)| 00:00:01 | 25 | 25 | | | |
| 38 | PX COORDINATOR | | | | | | | | | | | |
| 39 | PX SEND QC (RANDOM) | :TQ20000 | 392K| 81M| | 97 (3)| 00:00:01 | | | Q2,00 | P->S | QC (RAND) |
| 40 | VIEW | | 392K| 81M| | 97 (3)| 00:00:01 | | | Q2,00 | PCWP | |
| 41 | PX BLOCK ITERATOR | | 392K| 20M| | 97 (3)| 00:00:01 | | | Q2,00 | PCWC | |
| 42 | TABLE ACCESS FULL | SYS_TEMP_0FDA4B738_9AA210CA | 392K| 20M| | 97 (3)| 00:00:01 | | | Q2,00 | PCWP | |
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Note
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- Degree of Parallelism is 8 because of table property
53 rows selected.