Oracle.dataaccess.dll Version 4.112.3.0 Download _best_ May 2026

Oracle.DataAccess.dll Version 4.112.3.0: The Complete Guide to Download, Installation, and Troubleshooting

Introduction

If you have arrived at this article searching for "oracle.dataaccess.dll version 4.112.3.0 download", you are likely a .NET developer or a database administrator maintaining a legacy application that connects to an Oracle Database. You may have encountered a FileNotFoundException, a BadImageFormatException, or a version mismatch error stating:

"Could not load file or assembly 'Oracle.DataAccess.dll, Version 4.112.3.0' or one of its dependencies."

This specific version—4.112.3.0—corresponds to Oracle Data Access Components (ODAC) 11.2 Release 4 (11.2.0.3.0). It is not the newest version (as of 2025, Oracle’s current managed driver is much later), but it remains critical for applications built on older frameworks such as .NET Framework 3.5, 4.0, or 4.5. oracle.dataaccess.dll version 4.112.3.0 download

In this long-form guide, we will cover:

• What Oracle.DataAccess.dll is.
• The significance of version 4.112.3.0.
• Official and safe download sources.
• Step-by-step installation instructions.
• Common pitfalls (32-bit vs. 64-bit, architecture mismatches).
• How to verify and register the DLL in the GAC.
• Troubleshooting errors.

Method 2: Use Oracle Universal Installer (if you have a source)

Some developers receive ODAC as part of an Oracle Database Client installation. Oracle

1. Run setup.exe from the Oracle Client or ODAC installer.
2. Choose “Custom” installation.
3. Ensure “Oracle Data Provider for .NET 4” is selected.
4. Complete the installation.

Code Example (C#):

using System;
using Oracle.DataAccess.Client;
class Program
static void Main()
string connString = "User Id=scott;Password=tiger;Data Source=ORCL;";
using (OracleConnection conn = new OracleConnection(connString))
conn.Open();
Console.WriteLine("Connected to Oracle using ODP.NET " + conn.ServerVersion);

Understanding Version 4.112.3.0

The version number 4.112.3.0 maps to:

• Major version: 4 (targets .NET Framework 4.x)
• Oracle product version: 11.2.0.3.0
• ODAC release: 11.2 Release 4 (11.2.0.3.0)
• Supported .NET Framework: 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.7, 4.8 (32-bit and 64-bit)

This version is commonly used with:

• Oracle Database 11g R2 (11.2.0.3)
• Windows Server 2008/2012
• IIS 7.0+

Key Characteristics of version 4.112.3.0

• Target .NET Framework: 2.0, 3.0, 3.5, and 4.0 (32-bit and 64-bit variants exist)
• Corresponding Oracle Client: 11.2.0.3.x (11g R2)
• Bitness: Both x86 and x64 versions are available, but they are not interchangeable – the bitness must match your application’s process.
• Unmanaged Dependency: Unlike newer ODP.NET Core (Managed Driver), this version relies on unmanaged Oracle Client libraries (oci.dll, oraocci11.dll, etc.) installed on the machine.
• Strong Name / Public Key Token: 89b483f429c47342

You cannot simply copy this DLL into a bin folder and expect it to work – the full Oracle Client (or Instant Client) must be installed and properly configured.