Powershell SqlCommand和StreamWriter慢寫

Question

我正在寫一個PowerShell腳本，從數據庫中提取任意的SQL查詢。這些查詢可能會變得非常大，在嘗試sqlcmd後，我最終得到了StreamWriter/SqlCommand組合。我遇到的問題是執行速度有點慢。像10倍一樣慢。我被告知它應該更快，因此問題。 要代碼！

   $conn.ChangeDatabase("MyDB") 
       $mycmd = new-object System.Data.SqlClient.SqlCommand($Myquery, $conn) 
       $mycmd.CommandType = [System.Data.CommandType]::Text 
       $mycmd.CommandTimeout = 300 
       echo "Executing Reader."   
       $Results = $mycmd.ExecuteReader() 


       echo "Opening file for writing."      
       $sw2 = new-object system.IO.StreamWriter($sqlOutput, 1) 
       echo "File Opened for Writing."  
       $delimiter = "," 
       echo "Starting Row Reading" 
       $Counter = $Results.FieldCount 
       echo $Counter 
       # Put in header row on first execution. 
       $currtext = "" 
       if ($Counter -gt 0) 
       { 
        echo "Writing Header Row as:" 
        for ($i = 0; $i -lt $Counter; $i++) 
        { 
         $currtext = $currtext + $Results.GetName($i) 
         if ($i -lt $Counter - 1) 
         {$currtext = $currtext + $delimiter} 
        } 

        echo $currtext 
        $sw2.writeline($currtext) 
        $firstexecution = 0 
       } 
       else 
       { 
        $sw2.writeline("No Data Found") 
       } 

       $rowcount = 0 
       while ($Results.Read()) 
       { 
        $rowcount = $rowcount + 1 
        #echo "Reading Row" 
        $i = 0 
        $currtext = "" 
        for ($i = 0; $i -lt $Counter; $i++) 
        { 
         #echo "Processing Row" 
         $currtext = $currtext + """" + [string]$Results[$i] + """" 
         if ($i -lt $Counter - 1) 
          { $currtext = $currtext + $delimiter } 
        } 
        #echo "Writing Line." 
        #echo $currtext 
        $sw2.writeline($currtext) 
       } 
       echo "Total Rowcount:" + $rowcount 
       $sw2.flush() 
       $sw2.close() 
       $sw2.dispose() 
       $Results.close() 

任何人都知道我在做什麼錯誤/如何解決它？通過行

$DBComputers = Invoke-Sqlcmd -ServerInstance $SQLServer -Username $SQLUsername -Password $SQLPassword ` 
-Database $SQLDatabase -Query "SELECT * FROM Physical WHERE Retired=0 AND OS LIKE '%Windows%' ORDER BY Name" 

Iteriate：

Answer 1

添加Snapins：

Add-PSSnapin SqlServerCmdletSnapin100 
Add-PSSnapin SqlServerProviderSnapin100 

打電話給你的變量：

$SQLUsername  = "user" 
$SQLPassword  = "password" 
$SQLDatabase  = "database" 
$SQLServer   = "localhost" 

抓住你的數據

foreach ($DBComputer in $DBComputers) { 

    Write-Host $DBComputer.Name ##$DBComputer.COLUMNNAME 

} 

通過使用上面的示例，我已經使用PowerShell完成了大量SQL。上面的例子查詢戴爾R720服務器上SQL標準實例的數據，速度相當不錯。這是Microsoft Access數據庫還是一個真正的SQL實例？ Access Engine並不理想，根據您的磁盤類型不同，重要的問題也很重要。

您提到了一個大型數據集，我認爲最重要的是確保數據庫建立索引並運行真正的SQL引擎，而無需從非代碼角度更多地瞭解數據庫。