性能瓶颈在函数的乱用。原代码黄色部分。

12分钟->35秒

---------------------------------------------------------------------------------------------

1.对两个函数调用多次,而且两个函数之间还有调用关系。(优化器是可以自动把函数体拆出来,拼到主查询里面一起优化的。但是太复杂了它也蒙。)

IsSpecial和gettradedate函数都是从1010表拿数据。

IsSpecial 扫2次1010表

Gettradedate 扫1次1010表

而4603表有25万多数据,对这个查询用了2次IsSpecial 和3次 Gettradedate,最糟糕的情况对1010表的扫描次数大约25万*(2+3) =125万次

用with把1010逻辑提出来,然后通过cross join连接到主查询,只扫一次。

2.这个案例跟昨天那个代码结构相似,但是情况正好相反。

如果把or改成union,性能反而会变慢。(昨天的把or改成union性能会变快)

开始判断性能瓶颈的时候发生了点悲剧。4603表有25万的数据,唯一性索引在OB_OBJECT_ID上面(错看成在f1_4603上了,o(╯□╰)o),而我们需要的只有2500左右,而且与1090相连用的是f1_4603.

所以错认为了走4603的索引效率会变高。

其实这个案例,不管索引在OB_OBJECT_ID还是f1_4603上面都没有用。因为真正把数据从25万筛选成2500的条件是在f3_4603上面,而f3上面没有索引,所以必须全表扫描。

所以,如果把or改成了union,本来对4603表的全扫描只扫1次,就会变成2次,效率反而降低。(昨天的案例把or改为union,从1次全表扫描变为2次索引扫描,效率提升)。

3.其他相似子查询,可按之前的办法合并。

-------------------------------优化后代码----------------------------------------------

with td as

(select max(f1_1010) - min(f1_1010) special,

max(f1_1010) ed,

min(f1_1010) sd

from (select f1_1010

from wind.tb_object_1010

where f1_1010 < to_char(&PlanTime, 'yyyymmdd')

order by f1_1010 desc)

where rownum <= 2)

select *

from (Select case

when f16_1090 like '%!%' then

substr(f16_1090, 1, instr(f16_1090, '!') - 1)

else

F16_1090

end Zqdm,

case

when nvl(F6_4603, 0) = 0 then

nvl(F4_4603, 0)

else

nvl(F6_4603, 0)

end Net_value,

0 Begin_Net,

case

when nvl(f4_4603, 0) <> 0 then

nvl(nvl(F5_4603, f4_4603), 0)

when nvl(f4_4603, 0) = 0 then

nvl(F5_4603, 0)

end Total_net,

---除货币基金累计未公布时,取单位净值[20140507]

0 Adjust_net,

0 Adjust_Int,

Case

When exists (select '1'

from wind.tb_object_1101

where f14_1101 = f2_1090

and f13_1101 = f3_4603

and f15_1101 = 1) Then

'Y'

Else

'N'

End div_date,

F3_4603 data_date,

Case

When Exists (Select '1'

From Wind.tb_object_4521

Where f1_4521 = f16_1090

And f14_4521 = F3_4603) Then

(Select f9_4521

From Wind.tb_object_4521

Where f1_4521 = f16_1090

And f14_4521 = F3_4603)

When f5_1090 = '上海' Then

'H'

When f5_1090 = '深圳' Then

'S'

Else

'Y'

End market,

Case

When Exists (Select '1'

From Wind.tb_object_4521

Where f1_4521 = f16_1090

And f14_4521 = F3_4603) Then

(Select f15_4521

From Wind.tb_object_4521

Where f1_4521 = f16_1090

And f14_4521 = F3_4603)

ELSE

F100_1099

END fund_type,

(select (F5_1115 * 10000)

from wind.tb_object_1115 a

where f1_1115 = f2_1090

and a.f2_1115 = (Select Max(b.F2_1115)

From wind.tb_object_1115 b

Where a.f1_1115 = b.f1_1115

And b.f2_1115 <= F3_4603)) Total_amt,

Null As BataValue

From wind.tb_object_1090

inner join wind.tb_object_4603 b

on F1_4603 = f2_1090

inner join wind.tb_object_1099

on f1_1099 = F2_1090

cross join td

Where (f19_1090 = '0' or f18_1090 >= to_char(&PlanTime, 'yyyymmdd'))

and ((td.special = 1 and td.ed = F3_4603) or

(td.special != 1 and F3_4603 > td.sd and F3_4603 <= td.ed)))

where length(zqdm) <= 6

union all

Select case

when f16_1090 = 'TZ0001' then

'TZ0002'

when f16_1090 = 'TZ0002' then

'TZ0001'

---小写转大写---

elSe

UPPER(f16_1090)

end Zqdm,

nvl(F3_4141, 0) Net_value,

0 Begin_Net,

case

when exists (select '1'

from wind.tb_object_1744

where f1_1744 = f1_4141

and f6_1744 = '货币市场型') then

0

else

nvl(nvl(F4_4141, F3_4141), 0)

end Total_net,

0 Adjust_net,

0 Adjust_Int,

'N' div_date,

f2_4141 data_date,

'Y' market,

nvl((select case

when f6_1744 = '货币市场型' then

'货币型'

else

f6_1744

end

from wind.tb_object_1744

where f1_1744 = f1_4141

and f6_1744 < > 'FOF'),

'债券型') fund_type,

nvl((Select f7_1772

From wind.tb_object_1772 b

Where f1_1772 = f2_1090

And f2_1772 = (Select Max(f2_1772)

From wind.tb_object_1772

Where b.f1_1772 = f1_1772)),

0) Total_amt,

null BataValue

From wind.tb_object_1090, wind.tb_object_4141 a

Where f1_4141 = f2_1090

And f2_4141 = (Select Max(f1_0012)

From wind.tb_object_0012

Where f1_0012 < to_char(&PlanTime, 'yyyymmdd')

And f3_0012 = 'CN'

And f4_0012 = 1

And F2_0012 = 'SSE')

AND F4_1090 = 'LC'

union

Select F16_1090 Zqdm,

nvl(F4_1449, 0) Net_value,

1 Begin_Net,

0 Total_net,

0 Adjust_net,

0 Adjust_Int,

'N' div_date,

F2_1449 data_date,

Case

When f5_1090 = '上海' Then

'H'

When f5_1090 = '深圳' Then

'S'

Else

'Y'

End market,

case

when exists (select '1'

from wind.tb_object_1400

where f2_1400 = f2_1090

and f6_1400 = '1'

and f3_1400 = '2001010503') then

'QDII'

else

(select decode(F100_1099, '货币市场型', '货币型', f100_1099)

from wind.tb_object_1099

where f1_1099 = f2_1090)

end fund_type,

(select F5_1115 * 10000

from wind.tb_object_1115 b

where f1_1115 = f2_1090

And b.f2_1115 = (Select Max(F2_1115)

From wind.tb_object_1115

Where f1_1115 = f2_1090

And f2_1115 < = f6_1449)) Total_amt,

(SELECT F4_5052

FROM WIND.TB_OBJECT_5052

WHERE F3_5052 = '613007000'

AND F1_5052 = F2_1090

AND F2_5052 =

(SELECT MAX(F2_5052)

FROM WIND.TB_OBJECT_5052

WHERE F1_5052 = F2_1090

AND F3_5052 = '613007000'

AND F2_5052 <= TO_CHAR(&PlanTime, 'YYYYMMDD'))) BataValue

From wind.tb_object_1090, wind.tb_object_1449 a

Where F1_1449 = f2_1090

And f19_1090 = '0'

and length(f16_1090) < = 6

and F3_1449 =

(select max(F16_1101)

from wind.tb_object_1101

where F16_1101 <= to_char(&PlanTime, 'yyyymmdd'))

AND NOT EXISTS (SELECT '1 '

from WIND.TB_OBJECT_4603

WHERE F3_4603 = F2_1449

AND F1_4603 = F1_1449)

------------------------原代码-------------------------------------------------------------

函数1:

create or replace function wind.GetTradeDate(p_start varchar2,p_inc number) return varchar2 is

Result varchar2(10);

begin

if p_start is null then

return null;

end if;

if p_inc<0 then

select min(f1_1010) into Result

from (select f1_1010 from wind.tb_object_1010

where f1_1010<p_start order by f1_1010 desc)

where rownum<=abs(p_inc);

elsif p_inc>0 then

select max(f1_1010) into Result

from (select f1_1010 from wind.tb_object_1010

where f1_1010>p_start order by f1_1010)

where rownum<=abs(p_inc);

else

Result:=p_start;

end if;

return(Result);

end GetTradeDate;

函数2:

create or replace function wind.IsSpecial(strDate varchar2) return number is

lastTradeDay varchar2(8);

nCount number;

begin

lastTradeDay := gettradeDate(strDate,-1);

select count(1) into nCount

from wind.tb_object_1010

where f1_1010 = to_char((to_date(lastTradeDay,'yyyymmdd') -1),'yyyymmdd');

return 1 - nCount;

end;

select *

from (Select case

when f16_1090 like '%!%' then

substr(f16_1090, 1, instr(f16_1090, '!') - 1)

else

F16_1090

end Zqdm,

case

when nvl(F6_4603, 0) = 0 then

nvl(F4_4603, 0)

else

nvl(F6_4603, 0)

end Net_value,

0 Begin_Net,

case

when nvl(f4_4603, 0) <> 0 then

nvl(nvl(F5_4603, f4_4603), 0)

when nvl(f4_4603, 0) = 0 then

nvl(F5_4603, 0)

end Total_net,

---除货币基金累计未公布时,取单位净值[20140507]

0 Adjust_net,

0 Adjust_Int,

Case

When exists (select '1'

from wind.tb_object_1101

where f14_1101 = f2_1090

and f13_1101 = f3_4603

and f15_1101 = 1) Then

'Y'

Else

'N'

End div_date,

F3_4603 data_date,

Case

When Exists (Select '1'

From Wind.tb_object_4521

Where f1_4521 = f16_1090

And f14_4521 = F3_4603) Then

(Select f9_4521

From Wind.tb_object_4521

Where f1_4521 = f16_1090

And f14_4521 = F3_4603)

When f5_1090 = '上海' Then

'H'

When f5_1090 = '深圳' Then

'S'

Else

'Y'

End market,

Case

When Exists (Select '1'

From Wind.tb_object_4521

Where f1_4521 = f16_1090

And f14_4521 = F3_4603) Then

(Select f15_4521

From Wind.tb_object_4521

Where f1_4521 = f16_1090

And f14_4521 = F3_4603)

ELSE

F100_1099

END fund_type,

(select (F5_1115 * 10000)

from wind.tb_object_1115 a

where f1_1115 = f2_1090

and a.f2_1115 = (Select Max(b.F2_1115)

From wind.tb_object_1115 b

Where a.f1_1115 = b.f1_1115

And b.f2_1115 <= F3_4603)) Total_amt,

Null As BataValue

From wind.tb_object_1090,

wind.tb_object_4603 b,

wind.tb_object_1099

Where F1_4603 = f2_1090

And f1_1099 = F2_1090

And (f19_1090 = '0' or f18_1090 >= to_char(&PlanTime, 'yyyymmdd'))

and (((IsSpecial(to_char(&PlanTime, 'yyyymmdd'))) = 0 and

gettradedate(to_char(&PlanTime, 'yyyymmdd'), -1) = F3_4603) or

(IsSpecial(to_char(&PlanTime, 'yyyymmdd')) = 1 and

F3_4603 >

gettradedate(gettradedate(to_char(&PlanTime, 'yyyymmdd'),

-1),

-1) and

F3_4603 <= gettradedate(to_char(&PlanTime, 'yyyymmdd'), -1))))

where length(zqdm) <= 6

union all

Select case

when f16_1090 = 'TZ0001' then

'TZ0002'

when f16_1090 = 'TZ0002' then

'TZ0001'

---小写转大写---

elSe

UPPER(f16_1090)

end Zqdm,

nvl(F3_4141, 0) Net_value,

0 Begin_Net,

case

when exists (select '1'

from wind.tb_object_1744

where f1_1744 = f1_4141

and f6_1744 = '货币市场型') then

0

else

nvl(nvl(F4_4141, F3_4141), 0)

end Total_net,

0 Adjust_net,

0 Adjust_Int,

'N' div_date,

f2_4141 data_date,

'Y' market,

nvl((select case

when f6_1744 = '货币市场型' then

'货币型'

else

f6_1744

end

from wind.tb_object_1744

where f1_1744 = f1_4141

and f6_1744 < > 'FOF'),

'债券型') fund_type,

nvl((Select f7_1772

From wind.tb_object_1772 b

Where f1_1772 = f2_1090

And f2_1772 = (Select Max(f2_1772)

From wind.tb_object_1772

Where b.f1_1772 = f1_1772)),

0) Total_amt,

null BataValue

From wind.tb_object_1090, wind.tb_object_4141 a

Where f1_4141 = f2_1090

And f2_4141 = (Select Max(f1_0012)

From wind.tb_object_0012

Where f1_0012 < to_char(&PlanTime, 'yyyymmdd')

And f3_0012 = 'CN'

And f4_0012 = 1

And F2_0012 = 'SSE')

AND F4_1090 = 'LC'

union

Select F16_1090 Zqdm,

nvl(F4_1449, 0) Net_value,

1 Begin_Net,

0 Total_net,

0 Adjust_net,

0 Adjust_Int,

'N' div_date,

F2_1449 data_date,

Case

When f5_1090 = '上海' Then

'H'

When f5_1090 = '深圳' Then

'S'

Else

'Y'

End market,

case

when exists (select '1'

from wind.tb_object_1400

where f2_1400 = f2_1090

and f6_1400 = '1'

and f3_1400 = '2001010503') then

'QDII'

else

(select decode(F100_1099, '货币市场型', '货币型', f100_1099)

from wind.tb_object_1099

where f1_1099 = f2_1090)

end fund_type,

(select F5_1115 * 10000

from wind.tb_object_1115 b

where f1_1115 = f2_1090

And b.f2_1115 = (Select Max(F2_1115)

From wind.tb_object_1115

Where f1_1115 = f2_1090

And f2_1115 < = f6_1449)) Total_amt,

(SELECT F4_5052

FROM WIND.TB_OBJECT_5052

WHERE F3_5052 = '613007000'

AND F1_5052 = F2_1090

AND F2_5052 =

(SELECT MAX(F2_5052)

FROM WIND.TB_OBJECT_5052

WHERE F1_5052 = F2_1090

AND F3_5052 = '613007000'

AND F2_5052 <= TO_CHAR(&PlanTime, 'YYYYMMDD'))) BataValue

From wind.tb_object_1090, wind.tb_object_1449 a

Where F1_1449 = f2_1090

And f19_1090 = '0'

and length(f16_1090) < = 6

and F3_1449 =

(select max(F16_1101)

from wind.tb_object_1101

where F16_1101 <= to_char(&PlanTime, 'yyyymmdd'))

AND NOT EXISTS (SELECT '1 '

from WIND.TB_OBJECT_4603

WHERE F3_4603 = F2_1449

AND F1_4603 = F1_1449)

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