На основании предыдущего вопроса и с большой помощью Дамир Сударевич (спасибо) У меня есть следующий SQL-код, который прекрасно работает, но очень медленно. Может кто-нибудь предложить, как я могу ускорить это и оптимизировать для скорости.
Я сейчас использую SQL Server Express 2008 (не 2005, как в моем первоначальном вопросе).
Этот код извлекает параметры и связанные с ними значения из нескольких таблиц и поворачивает таблицу в форме, которую можно легко сравнить. Это отлично подходит для одной из двух строк данных, но сейчас я тестирую с 100 строками, а запуск GetJobParameters занимает более 7 минут?
Любой совет с благодарностью принят, спасибо заранее.
/***********************************************************************************************
** CREATE A VIEW (VIRTUAL TABLE) TO ALLOW EASIER RETREIVAL OF PARMETERS
************************************************************************************************/
CREATE VIEW dbo.vParameters AS
SELECT m.MachineID AS [Machine ID]
,j.JobID AS [Job ID]
,p.ParamID AS [Param ID]
,t.ParamTypeID AS [Param Type ID]
,m.Name AS [Machine Name]
,j.Name AS [Job Name]
,t.Name AS [Param Type Name]
,t.JobDataType AS [Job DataType]
,x.Value AS [Measurement Value]
,x.Unit AS [Unit]
,y.Value AS [JobDataType]
FROM dbo.Machines AS m
JOIN dbo.JobFiles AS j ON j.MachineID = m.MachineID
JOIN dbo.JobParams AS p ON p.JobFileID = j.JobID
JOIN dbo.JobParamType AS t ON t.ParamTypeID = p.ParamTypeID
LEFT JOIN dbo.JobMeasurement AS x ON x.ParamID = p.ParamID
LEFT JOIN dbo.JobTrait AS y ON y.ParamID = p.ParamID
GO
-- Step 2
CREATE VIEW dbo.vJobValues AS
SELECT [Job Name]
,[Param Type Name]
,COALESCE(cast([Measurement Value] AS varchar(50)), [JobDataType]) AS [Val]
FROM dbo.vParameters
GO
/***********************************************************************************************
** GET JOB PARMETERS FROM THE VIEW JUST CREATED
************************************************************************************************/
CREATE PROCEDURE GetJobParameters
AS
-- Step 3
DECLARE @Params TABLE (
id int IDENTITY (1,1)
,ParamName varchar(50)
);
INSERT INTO @Params (ParamName)
SELECT DISTINCT [Name]
FROM dbo.JobParamType
-- Step 4
DECLARE @qw TABLE(
id int IDENTITY (1,1)
, txt nchar(300)
)
INSERT INTO @qw (txt)
SELECT 'SELECT' UNION
SELECT '[Job Name]' ;
INSERT INTO @qw (txt)
SELECT ',MAX(CASE [Param Type Name] WHEN ''' + ParamName
+ ''' THEN Val ELSE NULL END) AS [' + ParamName + ']'
FROM @Params
ORDER BY id;
INSERT INTO @qw (txt)
SELECT 'FROM dbo.vJobValues' UNION
SELECT 'GROUP BY [Job Name]' UNION
SELECT 'ORDER BY [Job Name]';
-- Step 5
--SELECT txt FROM @qw
DECLARE @sql_output VARCHAR (MAX)
SET @sql_output = '' -- NULL + '' = NULL, so we need to have a seed
SELECT @sql_output = -- string to avoid losing the first line.
COALESCE (@sql_output + txt + char (10), '')
FROM @qw
EXEC (@sql_output)
GO
Вывод @sql_output:
SELECT
[Job Name]
,MAX(CASE [Param Type Name] WHEN '001' THEN Val ELSE NULL END) AS [001]
,MAX(CASE [Param Type Name] WHEN '002' THEN Val ELSE NULL END) AS [002]
,MAX(CASE [Param Type Name] WHEN '003' THEN Val ELSE NULL END) AS [003]
,MAX(CASE [Param Type Name] WHEN '004' THEN Val ELSE NULL END) AS [004]
,MAX(CASE [Param Type Name] WHEN '005' THEN Val ELSE NULL END) AS [005]
,MAX(CASE [Param Type Name] WHEN '006' THEN Val ELSE NULL END) AS [006]
,MAX(CASE [Param Type Name] WHEN '007' THEN Val ELSE NULL END) AS [007]
,MAX(CASE [Param Type Name] WHEN '008' THEN Val ELSE NULL END) AS [008]
,MAX(CASE [Param Type Name] WHEN '009' THEN Val ELSE NULL END) AS [009]
,MAX(CASE [Param Type Name] WHEN '010' THEN Val ELSE NULL END) AS [010]
,MAX(CASE [Param Type Name] WHEN '011' THEN Val ELSE NULL END) AS [011]
,MAX(CASE [Param Type Name] WHEN '012' THEN Val ELSE NULL END) AS [012]
,MAX(CASE [Param Type Name] WHEN '013' THEN Val ELSE NULL END) AS [013]
,MAX(CASE [Param Type Name] WHEN '014' THEN Val ELSE NULL END) AS [014]
,MAX(CASE [Param Type Name] WHEN '015' THEN Val ELSE NULL END) AS [015]
,MAX(CASE [Param Type Name] WHEN '016' THEN Val ELSE NULL END) AS [016]
,MAX(CASE [Param Type Name] WHEN 'Acceptance' THEN Val ELSE NULL END) AS [Acceptance]
,MAX(CASE [Param Type Name] WHEN 'AdditionalOptionsAperture1' THEN Val ELSE NULL END) AS [AdditionalOptionsAperture1]
,MAX(CASE [Param Type Name] WHEN 'AdditionalOptionsAperture2' THEN Val ELSE NULL END) AS [AdditionalOptionsAperture2]
,MAX(CASE [Param Type Name] WHEN 'AdditionalOptionsBarcode' THEN Val ELSE NULL END) AS [AdditionalOptionsBarcode]
,MAX(CASE [Param Type Name] WHEN 'AdditionalOptionsFiducial1' THEN Val ELSE NULL END) AS [AdditionalOptionsFiducial1]
,MAX(CASE [Param Type Name] WHEN 'AdditionalOptionsFiducial2' THEN Val ELSE NULL END) AS [AdditionalOptionsFiducial2]
,MAX(CASE [Param Type Name] WHEN 'AlignsFirstPcb' THEN Val ELSE NULL END) AS [AlignsFirstPcb]
,MAX(CASE [Param Type Name] WHEN 'Aperture1DefinedX' THEN Val ELSE NULL END) AS [Aperture1DefinedX]
,MAX(CASE [Param Type Name] WHEN 'Aperture1DefinedY' THEN Val ELSE NULL END) AS [Aperture1DefinedY]
и еще 200 строк ...
Это схема:
CREATE TABLE Machines (
MachineID UNIQUEIDENTIFIER PRIMARY KEY,
PrinterType NVARCHAR(255), --UNIQUEIDENTIFIER REFERENCES PrinterTypes(TypeId),
Name NVARCHAR(255),
[Desc] NVARCHAR(MAX),
HostName NVARCHAR(255),
IP NVARCHAR(64), -- allows IPv4 and IPv6
Serial NVARCHAR(10),
Location NVARCHAR(255) )
GO
CREATE TABLE JobFiles (
JobID UNIQUEIDENTIFIER PRIMARY KEY,
MachineID UNIQUEIDENTIFIER REFERENCES Machines(MachineID) ON DELETE CASCADE,
[Desc] NVARCHAR(MAX),
Name NVARCHAR(255),
JobOpen BIT,
[CreateDate] DATETIME ,
[ModifyDate] DATETIME ,
[CreatedByUser] NVARCHAR(64) ,
[ModifiedByUser] NVARCHAR(64) )
GO
CREATE TABLE JobParamType (
ParamTypeID UNIQUEIDENTIFIER PRIMARY KEY,
Name NVARCHAR(255),
[Desc] NVARCHAR(MAX),
JobDataType INT)
GO
CREATE TABLE JobParamGroup (
ParamGroupID UNIQUEIDENTIFIER PRIMARY KEY,
Name NVARCHAR(255),
[Desc] NVARCHAR(MAX))
GO
CREATE TABLE JobParams (
ParamID UNIQUEIDENTIFIER PRIMARY KEY,
ParamTypeID UNIQUEIDENTIFIER REFERENCES JobParamType(ParamTypeID) ON DELETE CASCADE,
ParamGroupID UNIQUEIDENTIFIER REFERENCES JobParamGroup(ParamGroupID) ON DELETE CASCADE,
JobFileID UNIQUEIDENTIFIER REFERENCES JobFiles(JobID) ON DELETE CASCADE,
IsEnabled BIT)
GO
-- Text based property
CREATE TABLE JobTrait (
ParamID UNIQUEIDENTIFIER PRIMARY KEY REFERENCES JobParams(ParamID) ON DELETE CASCADE,
Value NVARCHAR(MAX) )
GO
-- Numeric based property
CREATE TABLE JobMeasurement (
ParamID UNIQUEIDENTIFIER PRIMARY KEY REFERENCES JobParams(ParamID) ON DELETE CASCADE,
Value FLOAT,
Format NVARCHAR(20),
Unit NVARCHAR(MAX) )