How Can I Improve the Performance of Importing Large Excel Datasets into MS Access Using VBA?

Importing Data to MS Access Using Excel VBA: Performance Improvements

When exporting data from Excel to an MS Access table, you may face performance issues when dealing with a large number of records. However, there are methods to optimize the process.

The provided VBA code loops through each row and inserts data into the Access table, a repetitive process that can be time-consuming for extensive datasets. To improve performance, consider using a single SQL INSERT statement for bulk insertion.

Optimized Code Using SQL INSERT:

Public Sub DoTrans()

  Set cn = CreateObject("ADODB.Connection")
  dbPath = Application.ActiveWorkbook.Path & "\FDData.mdb"
  dbWb = Application.ActiveWorkbook.FullName
  dbWs = Application.ActiveSheet.Name
  scn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & dbPath
  dsh = "[" & Application.ActiveSheet.Name & "$]"
  cn.Open scn

  ssql = "INSERT INTO fdFolio ([fdName], [fdOne], [fdTwo]) "
  ssql = ssql & "SELECT * FROM [Excel 8.0;HDR=YES;DATABASE=" & dbWb & "]." & dsh

  cn.Execute ssql

End Sub

Implementation:

• The above code establishes a connection to the Access database using ADODB.Connection.
• It forms an SQL INSERT statement to insert data into the fdFolio table with specified field names.
• The Execute method executes the SQL statement, performing the bulk insert operation.

This optimized code eliminates the need for looping through each row, significantly improving performance for large datasets.

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