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IDE: Visual Studio 2013 pro - update 4
Oracle Client: 12.1
dotConnect for Oracle: 8.4.397

Unable to generate the model because of the following exception: 'System.Data.Entity.Core.EntityCommandExecutionException: An error occurred while executing the command definition. See the inner exception for details. ---> Devart.Data.Oracle.OracleException: Value length exceeds the parameter size
at Devart.Data.Oracle.OracleParameter.a(OracleDbType A_0, Object A_1, Object A_2, Byte[] A_3, Hashtable A_4, Int32 A_5, Int32 A_6, Int32 A_7, Int32 A_8, Int32 A_9, Boolean A_10, OracleConnection A_11, ParameterDirection A_12, OracleType A_13, t A_14, Boolean& A_15)
at Devart.Data.Oracle.OracleParameter.a(b4& A_0, Boolean A_1, OracleConnection A_2, Byte[] A_3, Hashtable A_4, t A_5, Boolean& A_6, Int32 A_7)
at Devart.Data.Oracle.OracleCommand.a(ao A_0, Int32 A_1, OracleParameterCollection A_2, t A_3, Boolean& A_4)
at Devart.Data.Oracle.OracleCommand.InternalExecute(CommandBehavior behavior, IDisposable disposable, Int32 startRecord, Int32 maxRecords, Boolean nonQuery)
at Devart.Common.DbCommandBase.ExecuteDbDataReader(CommandBehavior behavior, Boolean nonQuery)
at Devart.Data.Oracle.OracleCommand.ExecuteNonQuery()
at Devart.Data.Oracle.OracleDataReader.FillSchemaTable(DataTable dataTable)
at Devart.Common.DbDataReaderBase.GetSchemaTable()
at Devart.Data.Oracle.OracleDataTable.GetSchemaTable()
at Devart.Common.DbDataTable.CacheGetSchemaTable()
at Devart.Common.DbDataTable.Open()
at Devart.Data.Oracle.Entity.az.f()
at Devart.Data.Oracle.Entity.az.a(Int32 A_0)
at Devart.Data.Oracle.Entity.f.a(CommandBehavior A_0)
at Devart.Data.Oracle.Entity.f.b(CommandBehavior A_0)
at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.<Reader>b__c(DbCommand t, DbCommandInterceptionContext`1 c)
at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)
at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext)
at System.Data.Entity.Internal.InterceptableDbCommand.ExecuteDbDataReader(CommandBehavior behavior)
at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
--- End of inner exception stack trace ---
at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.Execute(EntityCommand entityCommand, CommandBehavior behavior)
at System.Data.Entity.Core.EntityClient.EntityCommand.ExecuteReader(CommandBehavior behavior)
at Microsoft.Data.Entity.Design.VersioningFacade.ReverseEngineerDb.SchemaDiscovery.FunctionDetailsReader..ctor(EntityCommand command, Version storeSchemaModelVersion)
at Microsoft.Data.Entity.Design.VersioningFacade.ReverseEngineerDb.SchemaDiscovery.EntityStoreSchemaGeneratorDatabaseSchemaLoader.LoadFunctionDetails(IEnumerable`1 filters)
at Microsoft.Data.Entity.Design.VersioningFacade.ReverseEngineerDb.SchemaDiscovery.EntityStoreSchemaGeneratorDatabaseSchemaLoader.LoadStoreSchemaDetails(IList`1 filters)
at Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Engine.ModelGenerator.GetStoreSchemaDetails(StoreSchemaConnectionFactory connectionFactory)
at Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Engine.ModelGenerator.CreateStoreModel()
at Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Engine.ModelGenerator.GenerateModel(List`1 errors)
at Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Engine.ModelBuilderEngine.GenerateModels(String storeModelNamespace, ModelBuilderSettings settings, List`1 errors)
at Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Engine.ModelBuilderEngine.GenerateModel(ModelBuilderSettings settings, IVsUtils vsUtils, ModelBuilderEngineHostContext hostContext)'.
Loading metadata from the database took 00:00:27.7002403.
Generating the model took 00:00:39.4460053.

1. The issue is caused by some table you add in Create Model Wizard (or Update From Database Wizard). Try to localize this particular table (or tables) and send us the corresponding DDL script.

2. Specify the version of your Oracle Server.

3. You are connecting in the OCI mode (via Oracle Client), aren't you?