【发布时间】：2014-03-21 04:06:53
【问题描述】：
我想优化我的 SQL 查询的一部分。我自己试过了，但它并没有变得更好，它变得更糟。我知道这个 SQL 代码不是最优的，它会消耗很多服务器性能。
insert
into #grid (
depotnummer , --varchar(18)
lagerstelle ,
bestand_num ,
bestand_neu_ist_num ,
betrag_num ,
kz_versteuerung_jn ,
id
)
select DEPOTNUMMER.PARAMETER_VARCHAR ,
LAGERSTELLE_EINBUCHEN.PARAMETER_VARCHAR,
BESTAND.PARAMETER_NUMERIC ,
ANZAHL_EINBUCHEN.PARAMETER_NUMERIC ,
0.00 ,
'J' ,
B.RBM_BUCHUNG_ID
from RBM_BUCHUNG B ,
RBM_BUCHUNG_PARAMETER DEPOTNUMMER ,
RBM_BUCHUNG_PARAMETER LAGERSTELLE_EINBUCHEN,
RBM_BUCHUNG_PARAMETER BESTAND ,
RBM_BUCHUNG_PARAMETER ANZAHL_EINBUCHEN ,
Kontenstamm K
where B.RBM_VORGANG_ID = @id
and DEPOTNUMMER.RBM_BUCHUNG_ID = B.RBM_BUCHUNG_ID and convert(char(20),DEPOTNUMMER.PARAMETER_NAME ) = convert(char(20),'depotnummer' )
and LAGERSTELLE_EINBUCHEN.RBM_BUCHUNG_ID = B.RBM_BUCHUNG_ID and convert(char(20),LAGERSTELLE_EINBUCHEN.PARAMETER_NAME) in( convert(char(20),'lagerstelle_einbuchen'),'lg_einbuchen')
and BESTAND.RBM_BUCHUNG_ID = B.RBM_BUCHUNG_ID and convert(char(20),BESTAND.PARAMETER_NAME ) = convert(char(20),'bestand' )
and ANZAHL_EINBUCHEN.RBM_BUCHUNG_ID = B.RBM_BUCHUNG_ID and convert(char(20),ANZAHL_EINBUCHEN.PARAMETER_NAME ) = convert(char(20),'anzahl_einbuchen' )
and K.Kontonummer = DEPOTNUMMER.PARAMETER_VARCHAR
and K.MANDANTEN_ID = isnull(@mandanten_id,K.MANDANTEN_ID)
update #grid
set primanoten_id = Primanoten_ID
from Primanoten P
where P.ID = id
and P.Quelle = 'RBM'
end
这就是展示计划的输出：
QUERY PLAN FOR STATEMENT 154 (at line 595).
STEP 1
The type of query is INSERT.
16 operator(s) under root
|ROOT:EMIT Operator (VA = 16)
|
| |INSERT Operator (VA = 15)
| | The update mode is direct.
| |
| | |MERGE JOIN Operator (Join Type: Inner Join) (VA = 14)
| | | Using Worktable3 for internal storage.
| | | Key Count: 1
| | | Key Ordering: ASC
| | |
| | | |MERGE JOIN Operator (Join Type: Inner Join) (VA = 11)
| | | | Using Worktable2 for internal storage.
| | | | Key Count: 1
| | | | Key Ordering: ASC
| | | |
| | | | |N-ARY NESTED LOOP JOIN Operator (VA = 8) has 4 children.
| | | | |
| | | | | |SORT Operator (VA = 1)
| | | | | | Average Row width is 6.000000
| | | | | | Using Worktable1 for internal storage.
| | | | | |
| | | | | | |SCAN Operator (VA = 0)
| | | | | | | FROM TABLE
| | | | | | | RBM_BUCHUNG
| | | | | | | B
| | | | | | | Index : SK1
| | | | | | | Forward Scan.
| | | | | | | Positioning by key.
| | | | | | | Keys are:
| | | | | | | RBM_VORGANG_ID ASC
| | | | | | | Using I/O Size 2 Kbytes for index leaf pages.
| | | | | | | With LRU Buffer Replacement Strategy for index leaf pages.
| | | | | | | Using I/O Size 2 Kbytes for data pages.
| | | | | | | With LRU Buffer Replacement Strategy for data pages.
| | | | |
| | | | | |RESTRICT Operator (VA = 3)(0)(0)(0)(6)(0)
| | | | | |
| | | | | | |SCAN Operator (VA = 2)
| | | | | | | FROM TABLE
| | | | | | | RBM_BUCHUNG_PARAMETER
| | | | | | | DEPOTNUMMER
| | | | | | | Index : SK1
| | | | | | | Forward Scan.
| | | | | | | Positioning by key.
| | | | | | | Keys are:
| | | | | | | RBM_BUCHUNG_ID ASC
| | | | | | | Using I/O Size 2 Kbytes for index leaf pages.
| | | | | | | With LRU Buffer Replacement Strategy for index leaf pages.
| | | | | | | Using I/O Size 2 Kbytes for data pages.
| | | | | | | With LRU Buffer Replacement Strategy for data pages.
| | | | |
| | | | | |RESTRICT Operator (VA = 5)(0)(0)(0)(6)(0)
| | | | | |
| | | | | | |SCAN Operator (VA = 4)
| | | | | | | FROM TABLE
| | | | | | | Kontenstamm
| | | | | | | K
| | | | | | | Index : SK2
| | | | | | | Forward Scan.
| | | | | | | Positioning by key.
| | | | | | | Keys are:
| | | | | | | Kontonummer ASC
| | | | | | | Using I/O Size 2 Kbytes for index leaf pages.
| | | | | | | With LRU Buffer Replacement Strategy for index leaf pages.
| | | | | | | Using I/O Size 2 Kbytes for data pages.
| | | | | | | With LRU Buffer Replacement Strategy for data pages.
| | | | |
| | | | | |RESTRICT Operator (VA = 7)(0)(0)(0)(6)(0)
| | | | | |
| | | | | | |SCAN Operator (VA = 6)
| | | | | | | FROM TABLE
| | | | | | | RBM_BUCHUNG_PARAMETER
| | | | | | | BESTAND
| | | | | | | Index : SK1
| | | | | | | Forward Scan.
| | | | | | | Positioning by key.
| | | | | | | Keys are:
| | | | | | | RBM_BUCHUNG_ID ASC
| | | | | | | Using I/O Size 2 Kbytes for index leaf pages.
| | | | | | | With LRU Buffer Replacement Strategy for index leaf pages.
| | | | | | | Using I/O Size 16 Kbytes for data pages.
| | | | | | | With LRU Buffer Replacement Strategy for data pages.
| | | |
| | | | |RESTRICT Operator (VA = 10)(0)(0)(0)(6)(0)
| | | | |
| | | | | |SCAN Operator (VA = 9)
| | | | | | FROM TABLE
| | | | | | RBM_BUCHUNG_PARAMETER
| | | | | | ANZAHL_EINBUCHEN
| | | | | | Index : SK1
| | | | | | Forward Scan.
| | | | | | Positioning at index start.
| | | | | | Using I/O Size 16 Kbytes for index leaf pages.
| | | | | | With LRU Buffer Replacement Strategy for index leaf pages.
| | | | | | Using I/O Size 16 Kbytes for data pages.
| | | | | | With LRU Buffer Replacement Strategy for data pages.
| | |
| | | |RESTRICT Operator (VA = 13)(0)(0)(0)(11)(0)
| | | |
| | | | |SCAN Operator (VA = 12)
| | | | | FROM TABLE
| | | | | RBM_BUCHUNG_PARAMETER
| | | | | LAGERSTELLE_EINBUCHEN
| | | | | Index : SK1
| | | | | Forward Scan.
| | | | | Positioning at index start.
| | | | | Using I/O Size 16 Kbytes for index leaf pages.
| | | | | With LRU Buffer Replacement Strategy for index leaf pages.
| | | | | Using I/O Size 16 Kbytes for data pages.
| | | | | With LRU Buffer Replacement Strategy for data pages.
| |
| | TO TABLE
| | #grid
| | Using I/O Size 2 Kbytes for data pages.
【问题讨论】：
-
你能发布一个架构吗？另外，你为什么要把所有的转换成 char 的东西？这几乎肯定会损害您的索引点击率......
-
因为所有的 SP 都是为了搜索那个小写字母而写的。重写所有 SP 将是“太多”。所以这样做很重要。
标签： sql performance optimization sybase sap-ase