次の列を持つテーブルがあります
symbol |market| bid_price | ask_price | update_time
------- ------ ----------- ----------- ------------
ABC US 123.00 675.00 20012-09-10 4:24:32.986
CDE SG 456.00 545.00 20012-09-10 4:26:32.986
そして、このテーブルを更新するために SP を呼び出すアプリケーション。
update price_tbl
set bid_price=@bid_price, ask_price=@ask_price, update_time = getdate()
where market = @market and symbol = @symbol
しかし、私のアプリケーションは 1 秒あたり 1000 を超える更新を呼び出しています。そのため、この SP はテーブルを更新するのに十分な速さではありません。確認したところ、 getdate() 関数がボトルネックであることがわかりました。しかし、このシステムはSQL Server 2000で実行されています.
- getdate() 以外の方法で時刻を更新できますか
- このアップデートのパフォーマンスを向上させるための他の提案。
参考までに: この price_tbl には約 2000 のレコードがあります。
テスト結果でエディ。
テーブル定義 ................................................................. ...................................................
CREATE TABLE [dbo].[GLDPrice](
[Company_code] [varchar](10) NOT NULL,
[Symbol] [varchar](10) NOT NULL,
[SymbolA] [varchar](10) NULL,
[SymbolB] [varchar](10) NULL,
[Market] [char](2) NOT NULL,
[ExchangeCode] [varchar](4) NULL,
[Remark] [char](6) NULL,
[Last_done] [numeric](19, 8) NULL,
[Change] [numeric](19, 8) NOT NULL,
[Open_Price] [numeric](19, 8) NULL,
[Closing_Price] [numeric](19, 8) NULL,
[Buy_Price] [numeric](19, 8) NULL,
[Sell_Price] [numeric](19, 8) NULL,
[Day_High] [numeric](19, 8) NULL,
[Day_Low] [numeric](19, 8) NULL,
[Time_done] [char](5) NULL,
[Cumm_vol] [int] NOT NULL,
[Buy_quantity] [int] NULL,
[Sell_quantity] [int] NULL,
[Per_Change] [numeric](19, 8) NULL,
[GLDBid] [numeric](19, 8) NULL,
[GLDAsk] [numeric](19, 8) NULL,
[GlobalGLDBid] [numeric](19, 8) NULL,
[GlobalGLDAsk] [numeric](19, 8) NULL,
[GLDBuyLastDone] [numeric](19, 8) NULL,
[GLDSellLastDone] [numeric](19, 8) NULL,
[GLDBuyLDUptTime] [datetime] NULL,
[GLDSellLDUptTime] [datetime] NULL,
[UpdateTime] [datetime] NOT NULL,
CONSTRAINT [PK_GLDPrice] PRIMARY KEY CLUSTERED
(
[Company_code] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
ALTER TABLE [dbo].[GLDPrice] ADD CONSTRAINT [DF_GLDPrice_SymbolA] DEFAULT (' ') FOR [SymbolA]
GO
ALTER TABLE [dbo].[GLDPrice] ADD CONSTRAINT [DF_GLDPrice_Last_done] DEFAULT (0) FOR [Last_done]
GO
ALTER TABLE [dbo].[GLDPrice] ADD DEFAULT (getdate()) FOR [UpdateTime]
GO
getdate() を使用した SP ............................................. ...................................................
ALTER PROCEDURE [dbo].[update_test_one]
@Symbol varchar(10),
@Market varchar(5),
@BuyPrice money,
@SellPrice money,
@LastPrice money,
@High money,
@Low money
AS
DECLARE @GLDBidPrice money
DECLARE @GLDAskPrice money
DECLARE @GlobalGLDBid money
DECLARE @GlobalGLDAsk money
DECLARE @GLDBidAdjust money
DECLARE @GLDAskAdjust money
DECLARE @GlobalBidAdjust money
DECLARE @GlobalAskAdjust money
SELECT @GLDBidPrice = @BuyPrice + 5
SELECT @GLDAskPrice = @SellPrice + 5
SELECT @GlobalGLDBid = @BuyPrice + 5
SELECT @GlobalGLDAsk = @SellPrice + 5
UPDATE dbo.GLDprice
SET Buy_price = @BuyPrice,
Sell_price = @SellPrice,
GLDBid = @GLDBidPrice,
GLDAsk = @GLDAskPrice,
Day_high = @High,
Day_Low = @Low,
GlobalGLDBid = @GlobalGLDBid,
GlobalGLDAsk = @GlobalGLDAsk,
UpdateTime=GetDate(),
Last_Done = @LastPrice
WHERE Symbol = @symbol AND Market = @Market
getdata() なしの SP .......................................................... ................................................................
ALTER PROCEDURE [dbo].[update_test_two]
@Symbol varchar(10),
@Market varchar(5),
@BuyPrice money,
@SellPrice money,
@LastPrice money,
@High money,
@Low money
AS
DECLARE @GLDBidPrice money
DECLARE @GLDAskPrice money
DECLARE @GlobalGLDBid money
DECLARE @GlobalGLDAsk money
DECLARE @GLDBidAdjust money
DECLARE @GLDAskAdjust money
DECLARE @GlobalBidAdjust money
DECLARE @GlobalAskAdjust money
SELECT @GLDBidPrice = @BuyPrice + 5
SELECT @GLDAskPrice = @SellPrice + 5
SELECT @GlobalGLDBid = @BuyPrice + 5
SELECT @GlobalGLDAsk = @SellPrice + 5
UPDATE dbo.GLDprice
SET Buy_price = @BuyPrice,
Sell_price = @SellPrice,
GLDBid = @GLDBidPrice,
GLDAsk = @GLDAskPrice,
Day_high = @High,
Day_Low = @Low,
GlobalGLDBid = @GlobalGLDBid,
GlobalGLDAsk = @GlobalGLDAsk,
Last_Done = @LastPrice
WHERE Symbol = @symbol AND Market = @Market
テスト スクリプト ................................................................. ...................................................
DECLARE @return_value int
DECLARE @count int
DECLARE @start datetime
SET NOCOUNT ON
SET @count = 0;
set @start = CURRENT_TIMESTAMP
WHILE (@count < 10000)
BEGIN
SET @count = @count + 1
EXEC [dbo].[update_test_one]
@Symbol = N'I9T',
@Market = N'SG',
@BuyPrice = 0.8,
@SellPrice = 0.8,
@LastPrice = 0.8,
@High = 0.8,
@Low = 0.8
EXEC [dbo].[update_test_one]
@Symbol = N'0001.HK',
@Market = N'HK',
@BuyPrice = 112,
@SellPrice = 112,
@LastPrice = 112,
@High = 112,
@Low = 112
END
print 'Test 01 : ' + CONVERT(varchar(20),DATEDIFF(millisecond,@start,CURRENT_TIMESTAMP))
SET @count = 0;
set @start = CURRENT_TIMESTAMP
WHILE (@count < 10000)
BEGIN
SET @count = @count + 1
EXEC [dbo].[update_test_two]
@Symbol = N'I9T',
@Market = N'SG',
@BuyPrice = 0.8,
@SellPrice = 0.8,
@LastPrice = 0.8,
@High = 0.8,
@Low = 0.8
EXEC [dbo].[update_test_two]
@Symbol = N'0001.HK',
@Market = N'HK',
@BuyPrice = 112,
@SellPrice = 112,
@LastPrice = 112,
@High = 112,
@Low = 112
END
print 'Test 02 : ' + CONVERT(varchar(20),DATEDIFF(millisecond,@start,CURRENT_TIMESTAMP))
GO
結果：
Test 01 : 82310
Test 02 : 12176
リバーステストの結果。
Test 02 : 15413
Test 01 : 81636