Posted: Wed Nov 05, 2008 12:10 pm Post subject: Тормозит селект по MSEG
Здравствуйте. Очень долго работет селект. Можно его оптимизировать?
Code:
DATA: BEGIN OF table_temp OCCURS 0,
mblnr LIKE mseg-mblnr,
budat LIKE mkpf-budat,
charg LIKE mseg-charg,
is_return LIKE mseg-smbln,
END OF table_temp.
SELECT mk~budat m1~mblnr
m1~charg m2~mblnr AS is_return
INTO CORRESPONDING FIELDS OF TABLE table_temp
FROM mseg AS m1
INNER JOIN mkpf AS mk ON mk~mblnr = m1~mblnr AND
mk~mjahr = m1~mjahr
LEFT JOIN mseg AS m2 ON
( m2~smbln = m1~mblnr AND
m2~sjahr = m1~mjahr AND
m2~smblp = m1~zeile AND
m2~bwart = '102' )
WHERE ( m1~ebeln = t_data-ebeln AND
m1~ebelp = t_data-ebelp AND
m1~bwart IN ('101', '103', '105') ).
Age: 120 Joined: 04 Oct 2007 Posts: 1218 Location: Санкт-Петербург
Posted: Wed Nov 05, 2008 1:41 pm Post subject:
Если в вашей системе существует индекс MSEG~S по полям smbln, sjahr, smblp, то торможение связано с использованием OUTER JOIN, для выполнения которого почти всегда (а может и всегда ) создается tmp таблица в базе.
Имхо, в данном случае, его лучше заменить набором селектов по полному ключу.
Code:
DATA: BEGIN OF table_temp OCCURS 0,
mblnr LIKE mseg-mblnr,
mjahr LIKE mseg-mjahr,
zeile LIKE mseg-zeile,
budat LIKE mkpf-budat,
charg LIKE mseg-charg,
is_return LIKE mseg-smbln,
END OF table_temp.
FIELD-SYMBOLS: <table_temp> LIKE table_temp.
SELECT m1~mblnr m1~mjahr m1~zeile mk~budat m1~charg
INTO CORRESPONDING FIELDS OF TABLE table_temp
FROM mseg AS m1
INNER JOIN mkpf AS mk ON mk~mblnr = m1~mblnr
AND mk~mjahr = m1~mjahr
WHERE m1~ebeln = t_data-ebeln
AND m1~ebelp = t_data-ebelp
AND m1~bwart IN ('101', '103', '105')
.
LOOP AT table_temp ASSIGNING <table_temp>.
SELECT SINGLE mblnr
INTO <table_temp>-is_return
FROM mseg
WHERE smbln = <table_temp>-mblnr
AND sjahr = <table_temp>-mjahr
AND smblp = <table_temp>-zeile
AND bwart = '102'.
ENDLOOP.
Age: 48 Joined: 25 Jan 2008 Posts: 580 Location: Москва
Posted: Wed Nov 05, 2008 8:51 pm Post subject: Re: Тормозит селект по MSEG
corsair wrote:
Здравствуйте. Очень долго работет селект. Можно его оптимизировать?
Code:
DATA: BEGIN OF table_temp OCCURS 0,
mblnr LIKE mseg-mblnr,
budat LIKE mkpf-budat,
charg LIKE mseg-charg,
is_return LIKE mseg-smbln,
END OF table_temp.
SELECT mk~budat m1~mblnr
m1~charg m2~mblnr AS is_return
INTO CORRESPONDING FIELDS OF TABLE table_temp
FROM mseg AS m1
INNER JOIN mkpf AS mk ON mk~mblnr = m1~mblnr AND
mk~mjahr = m1~mjahr
LEFT JOIN mseg AS m2 ON
( m2~smbln = m1~mblnr AND
m2~sjahr = m1~mjahr AND
m2~smblp = m1~zeile AND
m2~bwart = '102' )
WHERE ( m1~ebeln = t_data-ebeln AND
m1~ebelp = t_data-ebelp AND
m1~bwart IN ('101', '103', '105') ).
Если выборка идет по заказам, вместо MSEG лучше использовать таблицу EKBE - там есть как данные mkpf, так и данные mseg (не все конечно, но для выборки данных достаточно).
А про сторно написал vga.
Единственно, что loop .. select ... можно заменить на select ...for all entries, будет небольшое повышение производительности за счет уменьшения количества обращений к БД. _________________ С уважением,
Удав.
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