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INTO CORRESPONDING FIELDS OF TABLE vs INTO TABLE



 
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XXX_:)
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PostPosted: Wed Sep 30, 2009 4:36 pm    Post subject: INTO CORRESPONDING FIELDS OF TABLE vs INTO TABLE Reply with quote

Добрый день, есть вопрос. Есть ли выигрыш в производительности INTO TABLE перед INTO CORRESPONDING FIELDS OF TABLE. Или в чем INTO TABLE лучше, чем INTO CORRESPONDING FIELDS OF TABLE?
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ppeter
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PostPosted: Wed Sep 30, 2009 4:56 pm    Post subject: Re: INTO CORRESPONDING FIELDS OF TABLE vs INTO TABLE Reply with quote

Вот нашел интересный примерчик:

XXX_:) wrote:

Added by Srihari Hebbar , last edited by Srihari Hebbar on Oct 04, 2007

A recent query on SDN prompted me to post this. The question was about whether an INTO CORRESPONDING FIELDS OF addition in a select statement will make significant difference to the selection time.

I decided to write a small piece of code to compare the run-time of two selects and compare them.

REPORT ZTEST_SELECT.


DATA: IT_BSEG TYPE TABLE OF BSEG.
DATA: t1 TYPE i,
t2 type i,
t3 type i,
t4 type i,
t0 type i.

*first select
GET RUN TIME FIELD t1.
SELECT * FROM BSEG
INTO CORRESPONDING FIELDS OF TABLE IT_BSEG
BYPASSING BUFFER.
GET RUN TIME FIELD t2.

*second select
GET RUN TIME FIELD t3.
SELECT * FROM BSEG INTO TABLE IT_BSEG
BYPASSING BUFFER.
GET RUN TIME FIELD t4.

t0 = t2 - t1.
write: 'INTO CORRESPONDING ', t0.
t0 = t4 - t3.
write: 'NORMAL', t0.

The results were as follows: INTO CORRESPONDING 4,476,553

NORMAL 831,611

I reversed the order of the selects to check if that makes a difference :

INTO CORRESPONDING 1,221,872

NORMAL 940,790

The number of entries in the table were around 17,000.

Therefore defining a structure exactly as per the select statement is seems to be better than the one where you use INTO CORRESPONDING FIELDS OF.
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ppeter
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PostPosted: Wed Sep 30, 2009 5:27 pm    Post subject: Reply with quote

проверил самостоятельно - действительно into corresponding примерно в 1,5 раза дольше отрабатывает. Думаю имеет смысл использовать только при выборке из join'ов.
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PostPosted: Wed Sep 30, 2009 5:49 pm    Post subject: Reply with quote

А еще замерьте в таблицу какого типа быстрее: STANDART или SORTED with unique key... Wink
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PostPosted: Thu Oct 01, 2009 12:26 am    Post subject: Reply with quote

ppeter wrote:
проверил самостоятельно - действительно into corresponding примерно в 1,5 раза дольше отрабатывает. Думаю имеет смысл использовать только при выборке из join'ов.

Выборка из BSEG в данном случае не показательна т.к. на самом деле на уровне БД считывается таблица rfblg.
Попробуйте выборку из BSIS вместо BSEG, к примеру.
И указывайте не select *, а десяток-другой полей Wink

При join вообще лучше select * не использовать. См. рекомендации SAP

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XXX_:)
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PostPosted: Thu Oct 01, 2009 3:24 pm    Post subject: Reply with quote

Dmitriy wrote:
А еще замерьте в таблицу какого типа быстрее: STANDART или SORTED with unique key... Wink

Так в какую же?

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vga
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PostPosted: Thu Oct 01, 2009 3:42 pm    Post subject: Reply with quote

XXX_:) wrote:
Dmitriy wrote:
А еще замерьте в таблицу какого типа быстрее: STANDART или SORTED with unique key... Wink

Так в какую же?


Конечно STANDART Smile
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XXX_:)
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PostPosted: Thu Oct 01, 2009 3:51 pm    Post subject: Reply with quote

а я уж смутился, думал какая то фича есть при выгрузке в SORTED Smile
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