Oracle bundles this exact DLL inside the Oracle Data Access Components (ODAC) package.
The Oracle.DataAccess.dll usually needs to be in the GAC for applications to find it properly. The ODAC installer generally does this automatically, but if you have a standalone DLL, you must use gacutil.exe . Step 4: Validate Compatibility
If you are starting a new project or can refactor, Oracle recommends switching to the Managed Driver Oracle.ManagedDataAccess.dll Oracle Forums
gacutil.exe /i Oracle.DataAccess.dllgacutil.exe /i Oracle.DataAccess.dll oracle.dataaccess.dll version 4.112.3.0 download
Are you installing this on a or a production IIS server ?
Locate (or the specific version matching your patch requirements).
Navigate to the official Oracle Technology Network (OTN) download page. Oracle bundles this exact DLL inside the Oracle
Add a runtime assembly redirection inside your application's configuration file ( web.config or app.config ) to map requests forward:
Comprehensive Guide to Oracle.DataAccess.dll Version 4.112.3.0
<runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <dependentAssembly> <assemblyIdentity name="Oracle.DataAccess" publicKeyToken="89b483f429c47342" culture="neutral"/> <bindingRedirect oldVersion="4.112.0.0-4.122.0.0" newVersion="4.112.3.0"/> </dependentAssembly> </assemblyBinding> </runtime> Step 4: Validate Compatibility If you are starting
: C:\Windows\Microsoft.NET\assembly\GAC_64\Oracle.DataAccess\v4.0_4.112.3.0__89b483f429c47342\ 4. Important Version Matching
If your project allows updates, migrate to . Available easily via the NuGet Package Manager, the managed driver is fully self-contained, written entirely in C#, eliminates the need to install an underlying Oracle Client, and works smoothly across both 32-bit and 64-bit environments without modification.
If your application expects the DLL to be globally available, you can register it manually to the GAC using the gacutil tool provided by the Visual Studio Command Prompt:
<section name="oracle.dataaccess.client" type="System.Data.Common.DbProviderConfigurationHandler, System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />