How Can I Achieve the Fastest Bulk Insert of Records into MS Access from .NET/C#?

Writing Large Number of Records (Bulk Insert) to Access in .NET/C#

When performing bulk insertions into an MS Access database from .NET, utilizing DAO often proves faster than employing ADO.NET.

Using DAO for Enhanced Performance

Accessing table columns via DAO fields in conjunction with disabling transactions optimizes the insertion process. The recommended approach and timings are as follows:

• 2.8 Seconds: Use DAO alongside DAO.Fields for referencing table columns and deactivate transactions.
• 11.0 Seconds: Utilize DAO and refer to columns using their index.
• 17.0 Seconds: Use DAO while referring to columns by name.

Other Approaches with Slower Performance

• 79.0 Seconds: Generate individual INSERT statements for each row using ADO.NET.
• 86.0 Seconds: Employ ADO.NET with a DataTable and DataAdapter for "batch" insertion (not supported by Access).
• 2.8 Seconds: Write to a text file and import into Access using Automation (fragile method).

Why DAO Excels for Large Record Inserts

• Direct access to table properties, including columns and their types.
• Simplified transaction handling.
• Reduced overhead compared to ADO.NET.

Additional Observations

• Using DAO.Fields to access columns significantly speeds up the process.
• Transactions can be beneficial but may incur overhead for small batch sizes.
• Referencing columns by index instead of name improves performance.

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