Sql 在子查询中按级别连接
我在Oracle数据库中使用connect_by_级别的子查询来提供与另一个表连接的日期。“连接方式”级别似乎导致查询运行非常缓慢。下面是我的慢查询：Sql 在子查询中按级别连接,sql,performance,oracle,query-optimization,Sql,Performance,Oracle,Query Optimization,我在Oracle数据库中使用connect_by_级别的子查询来提供与另一个表连接的日期。“连接方式”级别似乎导致查询运行非常缓慢。下面是我的慢查询： select t.code, d.month_end, count(*) from device t, (select add_months(trunc(sysdate, 'MM'), - (level - 1)) - 1 MONTH_END from dual connect by leve
select t.code, d.month_end, count(*)
from device t,
(select add_months(trunc(sysdate, 'MM'), - (level - 1)) - 1 MONTH_END
from dual
connect by level <= 1) d
where (d.month_end between t.date and t.exp_date)
group by t.code, d.month_end
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop | TQ |IN-OUT| PQ Distrib |
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 520 | 65520 | 134K (1)| 00:00:03 | | | | | |
| 1 | PX COORDINATOR | | | | | | | | | | |
| 2 | PX SEND QC (RANDOM) | :TQ10006 | 520 | 65520 | 134K (1)| 00:00:03 | | | Q1,06 | P->S | QC (RAND) |
| 3 | HASH GROUP BY | | 520 | 65520 | 134K (1)| 00:00:03 | | | Q1,06 | PCWP | |
| 4 | PX RECEIVE | | 520 | 65520 | 134K (1)| 00:00:03 | | | Q1,06 | PCWP | |
| 5 | PX SEND HASH | :TQ10005 | 520 | 65520 | 134K (1)| 00:00:03 | | | Q1,05 | P->P | HASH |
| 6 | HASH GROUP BY | | 520 | 65520 | 134K (1)| 00:00:03 | | | Q1,05 | PCWP | |
|* 7 | HASH JOIN OUTER | | 520 | 65520 | 134K (1)| 00:00:03 | | | Q1,05 | PCWP | |
| 8 | PX RECEIVE | | 520 | 48880 | 134K (1)| 00:00:03 | | | Q1,05 | PCWP | |
| 9 | PX SEND HASH | :TQ10003 | 520 | 48880 | 134K (1)| 00:00:03 | | | Q1,03 | P->P | HASH |
|* 10 | HASH JOIN OUTER BUFFERED | | 520 | 48880 | 134K (1)| 00:00:03 | | | Q1,03 | PCWP | |
| 11 | PX RECEIVE | | | | | | | | Q1,03 | PCWP | |
| 12 | PX SEND HASH | :TQ10001 | | | | | | | Q1,01 | P->P | HASH |
| 13 | NESTED LOOPS | | | | | | | | Q1,01 | PCWP | |
| 14 | NESTED LOOPS | | 276 | 13800 | 50303 (0)| 00:00:01 | | | Q1,01 | PCWP | |
| 15 | BUFFER SORT | | | | | | | | Q1,01 | PCWC | |
| 16 | PX RECEIVE | | | | | | | | Q1,01 | PCWP | |
| 17 | PX SEND BROADCAST | :TQ10000 | | | | | | | | S->P | BROADCAST |
| 18 | VIEW | | 1 | 6 | 3 (0)| 00:00:01 | | | | | |
|* 19 | CONNECT BY WITHOUT FILTERING| | | | | | | | | | |
| 20 | FAST DUAL | | 1 | | 3 (0)| 00:00:01 | | | | | |
| 21 | PX PARTITION RANGE ALL | | 3898K| | 1656 (0)| 00:00:01 | 1 | 75 | Q1,01 | PCWC | |
|* 22 | INDEX RANGE SCAN | FTR_DT_IX1 | 3898K| | 1656 (0)| 00:00:01 | 1 | 75 | Q1,01 | PCWP | |
|* 23 | TABLE ACCESS BY LOCAL INDEX ROWID| FTR_DT | 276 | 12144 | 50300 (0)| 00:00:01 | 1 | 1 | Q1,01 | PCWP | |
| 24 | PX RECEIVE | | 7344K| 308M| 83875 (1)| 00:00:02 | | | Q1,03 | PCWP | |
| 25 | PX SEND HASH | :TQ10002 | 7344K| 308M| 83875 (1)| 00:00:02 | | | Q1,02 | P->P | HASH |
| 26 | PX BLOCK ITERATOR | | 7344K| 308M| 83875 (1)| 00:00:02 | | | Q1,02 | PCWC | |
|* 27 | TABLE ACCESS STORAGE FULL | DTL_HIST_DT | 7344K| 308M| 83875 (1)| 00:00:02 | | | Q1,02 | PCWP | |
| 28 | PX RECEIVE | | 108K| 3376K| 275 (0)| 00:00:01 | | | Q1,05 | PCWP | |
| 29 | PX SEND HASH | :TQ10004 | 108K| 3376K| 275 (0)| 00:00:01 | | | Q1,04 | P->P | HASH |
| 30 | PX BLOCK ITERATOR | | 108K| 3376K| 275 (0)| 00:00:01 | | | Q1,04 | PCWC | |
|* 31 | TABLE ACCESS STORAGE FULL | POINT_T | 108K| 3376K| 275 (0)| 00:00:01 | | | Q1,04 | PCWP | |
Predicate Information (identified by operation id):
---------------------------------------------------
7 - access("C"."CODE"="AP"."CODE"(+) AND "C"."POINT_ID"="AP"."POINT_ID"(+))
10 - access("CF"."P_ID"="C"."WTN"(+))
19 - filter(LEVEL<=1)
22 - access("CF"."DATE"<=INTERNAL_FUNCTION("D"."MONTH_END"))
23 - filter(UPPER("CF"."PLAN") LIKE '%DV%' AND ("CF"."FT_CODE"='7370' OR "CF"."FT_CODE"='7371' OR "CF"."FT_CODE"='7372' OR
"CF"."FT_CODE"='7373' OR "CF"."FT_CODE"='7374' OR "CF"."FT_CODE"='7380' OR "CF"."FT_CODE"='7380C' OR "CF"."FT_CODE"='7381' OR
"CF"."FT_CODE"='7381C' OR "CF"."FT_CODE"='7382' OR "CF"."FT_CODE"='7382C' OR "CF"."FT_CODE"='7383' OR "CF"."FT_CODE"='7384' OR
"CF"."FT_CODE"='7409' OR "CF"."FT_CODE"='7409C' OR "CF"."FT_CODE"='7410' OR "CF"."FT_CODE"='7410C' OR "CF"."FT_CODE"='TRKDV') AND
"CF"."EXP_DATE">=INTERNAL_FUNCTION("D"."MONTH_END"))
27 - storage("C"."EXP_DATE"(+)>=TRUNC(SYSDATE@!,'fmmm')-1 AND "C"."DATE"(+)<=TRUNC(SYSDATE@!,'fmmm')-1)
filter("C"."EXP_DATE"(+)>=TRUNC(SYSDATE@!,'fmmm')-1 AND "C"."DATE"(+)<=TRUNC(SYSDATE@!,'fmmm')-1)
31 - storage("AP"."EXP_DATE"(+)>=TRUNC(SYSDATE@!,'fmmm')-1 AND "AP"."DATE"(+)<=TRUNC(SYSDATE@!,'fmmm')-1)
filter("AP"."EXP_DATE"(+)>=TRUNC(SYSDATE@!,'fmmm')-1 AND "AP"."DATE"(+)<=TRUNC(SYSDATE@!,'fmmm')-1)
Note
-----
- dynamic sampling used for this statement (level=6)
- automatic DOP: Computed Degree of Parallelism is 8
select t.code, d.month_end, count(*)
from device t,
(select add_months(trunc(sysdate, 'MM'), - (level - 1)) - 1 MONTH_END
from dual
connect by level <= 1) d
where (d.month_end between t.date and t.exp_date)
group by t.code, d.month_end
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop | TQ |IN-OUT| PQ Distrib |
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 520 | 65520 | 134K (1)| 00:00:03 | | | | | |
| 1 | PX COORDINATOR | | | | | | | | | | |
| 2 | PX SEND QC (RANDOM) | :TQ10006 | 520 | 65520 | 134K (1)| 00:00:03 | | | Q1,06 | P->S | QC (RAND) |
| 3 | HASH GROUP BY | | 520 | 65520 | 134K (1)| 00:00:03 | | | Q1,06 | PCWP | |
| 4 | PX RECEIVE | | 520 | 65520 | 134K (1)| 00:00:03 | | | Q1,06 | PCWP | |
| 5 | PX SEND HASH | :TQ10005 | 520 | 65520 | 134K (1)| 00:00:03 | | | Q1,05 | P->P | HASH |
| 6 | HASH GROUP BY | | 520 | 65520 | 134K (1)| 00:00:03 | | | Q1,05 | PCWP | |
|* 7 | HASH JOIN OUTER | | 520 | 65520 | 134K (1)| 00:00:03 | | | Q1,05 | PCWP | |
| 8 | PX RECEIVE | | 520 | 48880 | 134K (1)| 00:00:03 | | | Q1,05 | PCWP | |
| 9 | PX SEND HASH | :TQ10003 | 520 | 48880 | 134K (1)| 00:00:03 | | | Q1,03 | P->P | HASH |
|* 10 | HASH JOIN OUTER BUFFERED | | 520 | 48880 | 134K (1)| 00:00:03 | | | Q1,03 | PCWP | |
| 11 | PX RECEIVE | | | | | | | | Q1,03 | PCWP | |
| 12 | PX SEND HASH | :TQ10001 | | | | | | | Q1,01 | P->P | HASH |
| 13 | NESTED LOOPS | | | | | | | | Q1,01 | PCWP | |
| 14 | NESTED LOOPS | | 276 | 13800 | 50303 (0)| 00:00:01 | | | Q1,01 | PCWP | |
| 15 | BUFFER SORT | | | | | | | | Q1,01 | PCWC | |
| 16 | PX RECEIVE | | | | | | | | Q1,01 | PCWP | |
| 17 | PX SEND BROADCAST | :TQ10000 | | | | | | | | S->P | BROADCAST |
| 18 | VIEW | | 1 | 6 | 3 (0)| 00:00:01 | | | | | |
|* 19 | CONNECT BY WITHOUT FILTERING| | | | | | | | | | |
| 20 | FAST DUAL | | 1 | | 3 (0)| 00:00:01 | | | | | |
| 21 | PX PARTITION RANGE ALL | | 3898K| | 1656 (0)| 00:00:01 | 1 | 75 | Q1,01 | PCWC | |
|* 22 | INDEX RANGE SCAN | FTR_DT_IX1 | 3898K| | 1656 (0)| 00:00:01 | 1 | 75 | Q1,01 | PCWP | |
|* 23 | TABLE ACCESS BY LOCAL INDEX ROWID| FTR_DT | 276 | 12144 | 50300 (0)| 00:00:01 | 1 | 1 | Q1,01 | PCWP | |
| 24 | PX RECEIVE | | 7344K| 308M| 83875 (1)| 00:00:02 | | | Q1,03 | PCWP | |
| 25 | PX SEND HASH | :TQ10002 | 7344K| 308M| 83875 (1)| 00:00:02 | | | Q1,02 | P->P | HASH |
| 26 | PX BLOCK ITERATOR | | 7344K| 308M| 83875 (1)| 00:00:02 | | | Q1,02 | PCWC | |
|* 27 | TABLE ACCESS STORAGE FULL | DTL_HIST_DT | 7344K| 308M| 83875 (1)| 00:00:02 | | | Q1,02 | PCWP | |
| 28 | PX RECEIVE | | 108K| 3376K| 275 (0)| 00:00:01 | | | Q1,05 | PCWP | |
| 29 | PX SEND HASH | :TQ10004 | 108K| 3376K| 275 (0)| 00:00:01 | | | Q1,04 | P->P | HASH |
| 30 | PX BLOCK ITERATOR | | 108K| 3376K| 275 (0)| 00:00:01 | | | Q1,04 | PCWC | |
|* 31 | TABLE ACCESS STORAGE FULL | POINT_T | 108K| 3376K| 275 (0)| 00:00:01 | | | Q1,04 | PCWP | |
Predicate Information (identified by operation id):
---------------------------------------------------
7 - access("C"."CODE"="AP"."CODE"(+) AND "C"."POINT_ID"="AP"."POINT_ID"(+))
10 - access("CF"."P_ID"="C"."WTN"(+))
19 - filter(LEVEL<=1)
22 - access("CF"."DATE"<=INTERNAL_FUNCTION("D"."MONTH_END"))
23 - filter(UPPER("CF"."PLAN") LIKE '%DV%' AND ("CF"."FT_CODE"='7370' OR "CF"."FT_CODE"='7371' OR "CF"."FT_CODE"='7372' OR
"CF"."FT_CODE"='7373' OR "CF"."FT_CODE"='7374' OR "CF"."FT_CODE"='7380' OR "CF"."FT_CODE"='7380C' OR "CF"."FT_CODE"='7381' OR
"CF"."FT_CODE"='7381C' OR "CF"."FT_CODE"='7382' OR "CF"."FT_CODE"='7382C' OR "CF"."FT_CODE"='7383' OR "CF"."FT_CODE"='7384' OR
"CF"."FT_CODE"='7409' OR "CF"."FT_CODE"='7409C' OR "CF"."FT_CODE"='7410' OR "CF"."FT_CODE"='7410C' OR "CF"."FT_CODE"='TRKDV') AND
"CF"."EXP_DATE">=INTERNAL_FUNCTION("D"."MONTH_END"))
27 - storage("C"."EXP_DATE"(+)>=TRUNC(SYSDATE@!,'fmmm')-1 AND "C"."DATE"(+)<=TRUNC(SYSDATE@!,'fmmm')-1)
filter("C"."EXP_DATE"(+)>=TRUNC(SYSDATE@!,'fmmm')-1 AND "C"."DATE"(+)<=TRUNC(SYSDATE@!,'fmmm')-1)
31 - storage("AP"."EXP_DATE"(+)>=TRUNC(SYSDATE@!,'fmmm')-1 AND "AP"."DATE"(+)<=TRUNC(SYSDATE@!,'fmmm')-1)
filter("AP"."EXP_DATE"(+)>=TRUNC(SYSDATE@!,'fmmm')-1 AND "AP"."DATE"(+)<=TRUNC(SYSDATE@!,'fmmm')-1)
Note
-----
- dynamic sampling used for this statement (level=6)
- automatic DOP: Computed Degree of Parallelism is 8
| Id | Operation | Name | Rows | Bytes | Cost（%CPU）| Time | Pstart | Pstop | TQ | IN-OUT | PQ Distrib|
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|0 |选择语句| 520 | 65520 | 134K（1）| 00:00:03 | | | ||
|1 | PX协调员| | | | | | | | ||
|2 | PX发送质控（随机）|：TQ10006 | 520 | 65520 | 134K（1）| 00:00:03 | Q1,06 | P->S |质控（兰德）|
|3 | HASH GROUP BY | 520 | 65520 | 134K（1）| 00:00:03 | | | Q1,06 | PCWP ||
|4 | PX接收| 520 | 65520 | 134K（1）| 00:00:03 | Q1,06 | PCWP ||
|5 | PX发送散列：TQ10005 | 520 | 65520 | 134K（1）| 00:00:03 | | | Q1,05 | P->P |散列|
|6 | HASH GROUP BY | 520 | 65520 | 134K（1）| 00:00:03 | | | Q1,05 | PCWP ||
|*7 | HASH JOIN OUTER | 520 | 65520 | 134K（1）| 00:00:03 | | | Q1,05 | PCWP ||
|8 | PX接收| 520 | 48880 | 134K（1）| 00:00:03 | Q1,05 | PCWP ||
|9 | PX发送散列|：TQ10003 | 520 | 48880 | 134K（1）| 00:00:03 | | Q1,03 | P->P |散列|
|*10 |散列连接外部缓冲| 520 | 48880 | 134K（1）| 00:00:03 | | | Q1,03 | PCWP ||
|11 | PX接收| | | | | | | | Q1,03 | PCWP ||
|12 | PX发送散列：TQ10001 | | | | | | | | | Q1,01 | P->P |散列|
|13 |嵌套循环| | | | | | | | Q1,01 | PCWP ||
|14 |嵌套循环| 276 | 13800 | 50303（0）| 00:00:01 | | | Q1,01 | PCWP ||
|15 |缓冲区排序| | | | | | | | Q1,01 | PCWC ||
|16 | PX接收| | | | | | | | Q1,01 | PCWP ||
|17 | PX发送广播|：TQ10000 | | | | | | | | S->P |广播|
|18 |视图| 1 | 6 | 3（0）| 00:00:01 | | | ||
|*19 |通过无过滤连接| | | | | | | | ||
|20 |快速双程| 1 | 3（0）| 00:00:01 | | | ||
|21 | PX分区范围所有| 3898K | 1656（0）| 00:00:01 | 1 | 75 | Q1,01 | PCWC ||
|*22 |索引范围扫描| FTR|U DT|IX1 | 3898K | 1656（0）| 00:00:01 | 1 | 75 | Q1,01 | PCWP ||
|*23 |本地索引ROWID的表访问| FTR|U DT | 276 | 12144 | 50300（0）| 00:00:01 | 1 | Q1,01 | PCWP ||
|24 | PX接收| 7344K | 308M | 83875（1）| 00:00:02 | Q1,03 | PCWP ||
|25 | PX发送散列|：TQ10002 | 7344K | 308M | 83875（1）| 00:00:02 | | | Q1,02 | P->P |散列|
|26 | PX块迭代器| 7344K | 308M | 83875（1）| 00:00:02 | | | Q1,02 | PCWC ||
|*27 |表访问存储已满| DTL | U HIST | DT | 7344K | 308M | 83875（1）| 00:00:02 | | | Q1,02 | PCWP ||
|28 | PX接收| 108K | 3376K | 275（0）| 00:00:01 | Q1,05 | PCWP ||
|29 | PX发送散列：TQ10004 | 108K | 3376K | 275（0）| 00:00:01 | | | Q1,04 | P->P |散列|
| 30 |
select t.code, trunc(t.exp_date, 'MM') - 1 month_end, count(*)
from device t
where t.date < :report_period_end
and t.exp_date > :report_period_start
group by t.code, trunc(t.exp_date,'MM') - 1;