優化筆記:pfyhparopenfundinfotest_D_20140916.gz

時間 2019-11-12

標籤 ide 函數性能優化 spa code orm 索引 element 欄目系統性能简体版

原文原文鏈接

性能瓶頸在函數的亂用。原代碼黃色部分。ide

12分鐘->35秒函數

---------------------------------------------------------------------------------------------性能

1.對兩個函數調用屢次，並且兩個函數之間還有調用關係。（優化器是能夠自動把函數體拆出來，拼到主查詢裏面一塊兒優化的。可是太複雜了它也蒙。）優化

IsSpecial和gettradedate函數都是從1010表拿數據。spa

IsSpecial 掃2次1010表code

Gettradedate 掃1次1010表orm

而4603表有25萬多數據，對這個查詢用了2次IsSpecial 和3次 Gettradedate，最糟糕的狀況對1010表的掃描次數大約25萬*（2+3） =125萬次索引

用with把1010邏輯提出來，而後經過cross join鏈接到主查詢，只掃一次。ci

2.這個案例跟昨天那個代碼結構類似，可是狀況正好相反。element

若是把or改爲union，性能反而會變慢。（昨天的把or改爲union性能會變快）

開始判斷性能瓶頸的時候發生了點悲劇。4603表有25萬的數據，惟一性索引在OB_OBJECT_ID上面（錯當作在f1_4603上了，o(╯□╰)o），而咱們須要的只有2500左右，並且與1090相連用的是f1_4603.

因此錯認爲了走4603的索引效率會變高。

其實這個案例，無論索引在OB_OBJECT_ID仍是f1_4603上面都沒有用。由於真正把數據從25萬篩選成2500的條件是在f3_4603上面，而f3上面沒有索引，因此必須全表掃描。

因此，若是把or改爲了union，原本對4603表的全掃描只掃1次，就會變成2次，效率反而下降。（昨天的案例把or改成union，從1次全表掃描變爲2次索引掃描，效率提高）。

3.其餘類似子查詢，可按以前的辦法合併。

-------------------------------優化後代碼----------------------------------------------

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,

---除貨幣基金累計未公佈時，取單位淨值[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'

---小寫轉大寫---

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 = '貨幣市場型') then

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 = '貨幣市場型' then

'貨幣型'

else

f6_1744

end

from wind.tb_object_1744

where f1_1744 = f1_4141

and f6_1744 < > 'FOF'),

'債券型') 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, '貨幣市場型', '貨幣型', 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)

------------------------原代碼-------------------------------------------------------------

函數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;

函數2：

create

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