SQL优化-利用with as的方式去掉nestloop连接
原语句：
select substr(i.disbdt, 1, 6),
'20150228',
nvl(sum(j.onlnbl), 0),
nvl(sum(k.orgibl) - sum(k.onlnbl), 0) + nvl(sum(m.tranam), 0),
nvl(sum(l1.onlnbl), 0),
nvl(sum(l2.onlnbl), 0),
nvl(sum(l3.onlnbl), 0),
nvl(sum(l4.onlnbl), 0),
nvl(sum(l6.onlnbl), 0),
nvl(sum(l6.onlnbl), 0),
nvl(sum(l7.onlnbl), 0),
nvl(sum(l8.orgibl) - sum(l8.onlnbl), 0),
nvl(sum(m.tranam), 0)
from tmp_mtlncf h
join srcapp.lnb_lncf i
on h.lncfno = i.lncfno
left join temp_cr_bl j
on i.acctid = j.acctid
and j.transt = '1'
left join temp_cr_bl k
on i.acctid = k.acctid
and k.lnbltp in ('2', 'A')
left join temp_cr_bl l1
on i.acctid = l1.acctid
and l1.transt = '1'
and l1.lnbltp = '2'
and To_Date('20150228', 'yyyymmdd') - l1.inptdt between 1 and 30
left join temp_cr_bl l2
on i.acctid = l2.acctid
and l2.transt = '1'
and l2.lnbltp = '2'
and To_Date('20150228', 'yyyymmdd') - l2.inptdt between 31 and 60
left join temp_cr_bl l3
on i.acctid = l3.acctid
and l3.transt = '1'
and l3.lnbltp = '2'
and To_Date('20150228', 'yyyymmdd') - l3.inptdt between 61 and 90
left join temp_cr_bl l4
on i.acctid = l4.acctid
and l4.transt = '1'
and l4.lnbltp = '2'
and To_Date('20150228', 'yyyymmdd') - l4.inptdt between 91 and 120
left join temp_cr_bl l5
on i.acctid = l5.acctid
and l5.transt = '1'
and l5.lnbltp = '2'
and To_Date('20150228', 'yyyymmdd') - l5.inptdt between 121 and 150
left join temp_cr_bl l6
on i.acctid = l6.acctid
and l6.transt = '1'
and l6.lnbltp = '2'
and To_Date('20150228', 'yyyymmdd') - l6.inptdt between 151 and 180
left join temp_cr_bl l7
on i.acctid = l7.acctid
and l7.transt = '1'
and l7.lnbltp = '2'
and To_Date('20150228', 'yyyymmdd') - l7.inptdt > 180
left join temp_cr_bl l8
on i.acctid = l8.acctid
and l8.lnbltp in ('2', 'A')
and l8.inptdt between
to_date(substr('20150228', 1, 6) || '01', 'yyyymmdd') and
to_date('20150228', 'yyyymmdd')
left join temp_ad_tm m
on i.acctid = m.acctid
where i.disbdt between '20110901' and '20150228'
group by substr(i.disbdt, 1, 6);执行计划：
34 --------------------------------------------------------------------------------------------------------------
35 | Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
36 --------------------------------------------------------------------------------------------------------------
37 | 0 | SELECT STATEMENT | | | | | 48M(100)| |
38 | 1 | HASH GROUP BY | | 339 | 91869 | | 48M (2)|188:31:53 |
39 | 2 | NESTED LOOPS OUTER | | 7228M| 1824G| | 47M (1)|186:29:46 |
40 | 3 | NESTED LOOPS OUTER | | 144M| 35G| | 76533 (2)| 00:17:52 |
41 | 4 | HASH JOIN RIGHT OUTER | | 66227 | 16M| | 9871 (1)| 00:02:19 |
42 | 5 | TABLE ACCESS FULL | TEMP_CR_BL | 46833 | 960K| | 1701 (2)| 00:00:24 |
43 | 6 | HASH JOIN RIGHT OUTER | | 66227 | 15M| | 8168 (1)| 00:01:55 |
44 | 7 | TABLE ACCESS FULL | TEMP_AD_TM | 2387 | 31031 | | 4 (0)| 00:00:01 |
45 | 8 | HASH JOIN RIGHT OUTER | | 66227 | 14M| | 8163 (1)| 00:01:55 |
46 | 9 | TABLE ACCESS BY INDEX ROWID | TEMP_CR_BL | 1333 | 27993 | | 447 (1)| 00:00:07 |
47 | 10 | INDEX RANGE SCAN | IDX_INPTDT | 8000 | | | 12 (0)| 00:00:01 |
48 | 11 | HASH JOIN RIGHT OUTER | | 66227 | 12M| | 7716 (1)| 00:01:49 |
49 | 12 | TABLE ACCESS BY INDEX ROWID | TEMP_CR_BL | 1333 | 27993 | | 447 (1)| 00:00:07 |
50 | 13 | INDEX RANGE SCAN | IDX_INPTDT | 8000 | | | 12 (0)| 00:00:01 |
51 | 14 | HASH JOIN RIGHT OUTER | | 66227 | 11M| | 7268 (1)| 00:01:42 |
52 | 15 | TABLE ACCESS BY INDEX ROWID | TEMP_CR_BL | 1333 | 27993 | | 447 (1)| 00:00:07 |
53 | 16 | INDEX RANGE SCAN | IDX_INPTDT | 8000 | | | 12 (0)| 00:00:01 |
54 | 17 | HASH JOIN OUTER | | 66227 | 10M| 3200K| 6821 (1)| 00:01:36 |
55 | 18 | HASH JOIN RIGHT OUTER | | 20315 | 2955K| | 4819 (1)| 00:01:08 |
56 | 19 | TABLE ACCESS BY INDEX ROWID | TEMP_CR_BL | 1333 | 27993 | | 447 (1)| 00:00:07 |
57 | 20 | INDEX RANGE SCAN | IDX_INPTDT | 8000 | | | 12 (0)| 00:00:01 |
58 | 21 | HASH JOIN RIGHT OUTER | | 20315 | 2539K| | 4371 (1)| 00:01:02 |
59 | 22 | TABLE ACCESS BY INDEX ROWID | TEMP_CR_BL | 1333 | 25327 | | 447 (1)| 00:00:07 |
60 | 23 | INDEX RANGE SCAN | IDX_INPTDT | 8000 | | | 12 (0)| 00:00:01 |
61 | 24 | HASH JOIN RIGHT OUTER | | 20315 | 2162K| | 3924 (1)| 00:00:55 |
62 | 25 | TABLE ACCESS BY INDEX ROWID| TEMP_CR_BL | 1333 | 27993 | | 447 (1)| 00:00:07 |
63 | 26 | INDEX RANGE SCAN | IDX_INPTDT | 8000 | | | 12 (0)| 00:00:01 |
64 | 27 | HASH JOIN | | 20315 | 1745K| | 3477 (1)| 00:00:49 |
65 | 28 | TABLE ACCESS FULL | TMP_MTLNCF | 20292 | 416K| | 15 (0)| 00:00:01 |
66 | 29 | TABLE ACCESS FULL | LNB_LNCF | 50284 | 3290K| | 3460 (1)| 00:00:49 |
67 | 30 | TABLE ACCESS FULL | TEMP_CR_BL | 163K| 2078K| | 1700 (2)| 00:00:24 |
68 | 31 | VIEW | | 2183 | 13098 | | 1 (0)| 00:00:01 |
69 | 32 | TABLE ACCESS FULL | TEMP_CR_BL | 5 | 85 | | 1688 (1)| 00:00:24 |
70 | 33 | VIEW | | 50 | 300 | | 0 (0)| |
71 | 34 | TABLE ACCESS BY INDEX ROWID | TEMP_CR_BL | 1 | 24 | | 417 (1)| 00:00:06 |
72 | 35 | INDEX RANGE SCAN | IDX_INPTDT | 7461 | | | 11 (0)| 00:00:01 |
73 --------------------------------------------------------------------------------------------------------------
尝试了各种方法,包括使用hint的方式,都无法去掉nestlop,来走我所期望的hash join
最后一个个尝试,到底是在哪个临时表走了nestloop,发现是l8和k 表, 于是将l8表和k表使用with as 的方式,惊喜的发现走了hash join,然后执行该语句,两秒中出结果,心里倍加舒坦.
改后的sql:
with a as
(select *
from temp_cr_bl l8
where l8.lnbltp in ('2', 'A') and
l8.inptdt between to_date('20150201', 'yyyymmdd') and
to_date('20150228', 'yyyymmdd')),
b as (
select * from temp_cr_bl k where k.lnbltp in ('2', 'A')
)
select substr(i.disbdt, 1, 6),
'20150228',
nvl(sum(j.onlnbl), 0),
nvl(sum(k.orgibl) - sum(k.onlnbl), 0) + nvl(sum(m.tranam), 0),
nvl(sum(l1.onlnbl), 0),
nvl(sum(l2.onlnbl), 0),
nvl(sum(l3.onlnbl), 0),
nvl(sum(l4.onlnbl), 0),
nvl(sum(l6.onlnbl), 0),
nvl(sum(l6.onlnbl), 0),
nvl(sum(l7.onlnbl), 0),
nvl(sum(l8.orgibl) - sum(l8.onlnbl), 0),
nvl(sum(m.tranam), 0)
from srcapp.lnb_lncf i
join tmp_mtlncf h
on h.lncfno = i.lncfno
left join temp_cr_bl j
on i.acctid = j.acctid
and j.transt = '1'
left join b k
on i.acctid = k.acctid
left join temp_cr_bl l1
on i.acctid = l1.acctid
and l1.transt = '1'
and l1.lnbltp = '2'
and l1.inptdt <= To_Date('20150228', 'yyyymmdd') - interval '1'
day(3)
and l1.inptdt >= To_Date('20150228', 'yyyymmdd') - interval '30'
day(3)
left join temp_cr_bl l2
on i.acctid = l2.acctid
and l2.transt = '1'
and l2.lnbltp = '2'
and l2.inptdt <= To_Date('20150228', 'yyyymmdd') - interval '31'
day(3)
and l2.inptdt >= To_Date('20150228', 'yyyymmdd') - interval '60'
day(3)
left join temp_cr_bl l3
on i.acctid = l3.acctid
and l3.transt = '1'
and l3.lnbltp = '2'
and l3.inptdt <= To_Date('20150228', 'yyyymmdd') - interval '61'
day(3)
and l3.inptdt >= To_Date('20150228', 'yyyymmdd') - interval '90'
day(3)
left join temp_cr_bl l4
on i.acctid = l4.acctid
and l4.transt = '1'
and l4.lnbltp = '2'
and l4.inptdt <= To_Date('20150228', 'yyyymmdd') - interval '91'
day(3)
and l4.inptdt >= To_Date('20150228', 'yyyymmdd') - interval '120'
day(3)
left join temp_cr_bl l5
on i.acctid = l5.acctid
and l5.transt = '1'
and l5.lnbltp = '2'
and l5.inptdt <= To_Date('20150228', 'yyyymmdd') - interval '121'
day(3)
and l5.inptdt >= To_Date('20150228', 'yyyymmdd') - interval '150'
day(3)
left join temp_cr_bl l6
on i.acctid = l6.acctid
and l6.transt = '1'
and l6.lnbltp = '2'
and l6.inptdt <= To_Date('20150228', 'yyyymmdd') - interval '151'
day(3)
and l6.inptdt >= To_Date('20150228', 'yyyymmdd') - interval '180'
day(3)
left join temp_cr_bl l7
on i.acctid = l7.acctid
and l7.transt = '1'
and l7.lnbltp = '2'
and l7.inptdt < To_Date('20150228', 'yyyymmdd') - interval '180'
day(3)
left join a l8
on i.acctid = l8.acctid
left join temp_ad_tm m
on i.acctid = m.acctid
where i.disbdt between '20110901' and '20150228'
group by substr(i.disbdt, 1, 6)