|Oracle® Data Provider for .NET Developer's Guide
11g Release 2 (184.108.40.206)
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This section describes new features in Oracle Data Provider for .NET and provides references to additional information. New features information from previous releases is also retained to help those users migrating to the current release.
The following sections describe the new features in Oracle Data Provider for .NET:
Oracle Data Provider for .NET release 220.127.116.11 includes the following:
ODP.NET now includes support for the ADO.NET Entity Framework and LINQ to Entities. Entity Framework is a framework for providing object-relational mapping service on data models. Entity Framework addresses the impedance mismatch between the relational database format and the client's preferred object format. Language Integrated Query (LINQ) defines a set of operators that can be used to query, project, and filter data in arrays, enumerable classes, XML, relational databases, and other data sources. One form of LINQ, LINQ to Entities, allows querying of Entity Framework data sources. ODP.NET supports Entity Framework such that the Oracle database can participate in object-relational modeling and LINQ to Entities queries.
Entity Framework and LINQ provides productivity benefits for the .NET developer. It abstracts the database's data model from the application's data model. Working with object-relational data becomes easier with Entity Framework's tools. Oracle's integration with Entity Framework and LINQ enables Oracle .NET developers to take advantage of all these productivity benefits.
See "ADO.NET Entity Framework and LINQ to Entities" for more information on ODP.NET support for the ADO.NET Entity Framework and LINQ to Entities.
Windows Communication Foundation (WCF) Data Services enable developers to create services that use the Open Data Protocol (OData) to expose and consume data over the internet by using the semantics of representational state transfer (REST). OData exposes data as resources that are addressable by URIs. OData uses Entity Data Model conventions to expose resources as sets of entities that are related by associations. ODP.NET supports Entity Framework, and can expose its data through OData and WCF Data Services.
WCF Data Services and OData facilitate creating flexible data services from any data source and naturally integrating them with the Web. All data sources, including Oracle databases, can be used by the same data sharing standard making data exchange more interoperable.
ODP.NET can bind REF CURSOR parameters for stored procedures without binding them explicitly. To do so, the application must provide the REF CURSOR metadata as part of the .NET configuration file. This feature allows Entity Framework Function Import to call Oracle stored procedures and return REF CURSOR result sets. ODP.NET can also update the database's data with a DataSet or DataTable obtained through a REF CURSOR.
In Entity Framework, result set parameters are generally not declared. By supporting the implicit REF CURSOR parameter, ODP.NET more closely integrates with typical Entity Framework usage scenarios.
See "Implicit REF CURSOR Binding" for detailed information on implicit REF CURSOR parameter binding.
Oracle Data Provider for .NET release 18.104.22.168 includes the following:
64-bit ODP.NET XCopy for Windows x64
Now available for Windows x64 systems, ODP.NET XCopy provides system administrators with a smaller client install size than the standard ODP.NET client, and is easier to configure. ODP.NET XCopy simplifies embedding ODP.NET in customized deployment packages.
See Also:XCopy under "Installing Oracle Data Provider for .NET"
TimesTen In-Memory Database Support
Oracle Data Provider for .NET enables fast data access for any .NET application, such as C# .NET, Visual Basic .NET, and ASP.NET, to TimesTen In-memory databases. ODP.NET support for TimesTen includes the classes, enumerations, interfaces, delegates and structures of the
Oracle.DataAccess.Types namespaces. ODP.NET supports TimesTen Release 22.214.171.124.1 or later on Microsoft Windows 32-bit and 64-bit platforms. TimesTen can be used with .NET Framework 2.0, 3.0, 3.5, and 4 with Microsoft Visual Studio 2005 or later.
See Also:The latest TimesTen In-Memory Database documentation and resources can be accessed from:
Oracle Data Provider for .NET release 126.96.36.199.2 includes the following:
Support for Microsoft .NET Framework 4
ODP.NET for .NET Framework 4 supports .NET Framework 4 and the .NET Framework 4 Client Profile.
Oracle Data Provider for .NET release 11.2 includes the following:
ODP.NET now supports the
ClientInfo write-only property, in addition to the
ModuleName properties, on the
OracleConnection object. This property specifies the client information for the connection.
ClientInfo property is an end-to-end tracing attribute that can be set on the client or middle tier. This attribute is propagated to the database server whenever the next server round-trip happens. This reduces the added overhead associated with an independent database round trip. Using the
ClientInfo property is helpful in tracking database user activities and debugging applications.
Edition-based redefinition enables you to upgrade the database component of an application even while the .NET application is being used. This minimizes or eliminates downtime for the application.
See Also:"Edition-Based Redefinition"
Oracle Data Provider for .NET release 188.8.131.52.20 includes the following:
Self-Tuning for Applications
Based on run-time sampling, ODP.NET dynamically adjusts statement cache size to provide better application performance. Self-tuning also takes into account memory usage on the client machine in order to prevent excessive memory usage. Self-tuning improves ODP.NET performance, reduces network usage, and decreases server CPU and client CPU activity.
Faster Data Retrieval and Less Memory Usage
Retrieving data using
OracleDataReader or populating a
DataSet from an
OracleDataAdapter is now faster.
ODP.NET reuses the same fetch array buffer for statements executed non-concurrently, saving on memory usage. The fetch array buffer stores data retrieved from the database.
No code changes are necessary to use these features. These features provide better performance and scalability for ODP.NET applications.
Oracle Streams Advanced Queuing Support
ODP.NET supports access to Oracle Streams Advanced Queuing (AQ). AQ provides database-integrated message queuing functionality to store messages persistently, propagate messages between queues on different machines and databases, and transmit messages using Oracle NET services, HTTP, HTTPS and SMTP.
ODP.NET can access all the operational featuers of AQ, such as enqueue, dequeue, listen and notification. Oracle Developer Tools for Visual Studio can administer and manage AQ resources.
Promotable Local Transaction Support
Distributed transactions require the orchestration of application, transaction coordinator, and multiple databases. Local transactions only require an application and a single resource manager, or database. Local transactions have less of an overhead when compared to distributed transactions.
It may be difficult to determine whether a transaction will be local or distributed at design time. Developers are forced to design applications for distributed transactions, even if local transactions are used most of the time. This situation leads to more resource usage than necessary at run time.
Promotable local transactions allow all transactions to remain local until more than one database is brought into the transaction. At this point, the transaction is promoted to a distributed transaction so that it can be managed by the transaction coordinator. This provides a better utilization of system resources. This feature is supported with Oracle Database 11g release 1 (184.108.40.206) and higher.
ODP.NET Security Enhancements
ODP.NET makes use of the
OraclePermission class to enforce imperative security. This helps ensure that a user or application has a security level adequate for accessing data.
Callbacks for HA Event Notifications
ODP.NET can register for Oracle High Availability (HA) events when "
ha events=true" is specified in the connection string. ODP.NET is then able to receive notifications on which database, service, host, or instance has gone down or come up. .NET developers can register a callback with ODP.NET to notify the application when one of these events occurs and subsequently execute an event handler, as needed.
Database Startup and Shutdown Operations
Users with database administrator privileges can use the
OracleDatabase class to startup or shutdown a database instance.
Oracle Data Provider for .NET release 220.127.116.11.20 includes the following:
32-bit ODP.NET XCopy
Oracle XCopy provides system administrators with an ODP.NET client that is smaller in disk size than the standard ODP.NET client and is easily configurable. Oracle XCopy makes embedding ODP.NET in customized deployment packages much simpler.
Support for Oracle User-Defined Types
ODP.NET has the ability to represent Oracle UDTs defined in the database as custom types in .NET applications.
Bulk Copy Operations
ODP.NET supports the Bulk Copy operations to load a large amount of data efficiently.
Additional Connection Pool Optimizations for Oracle Real Application Clusters (Oracle RAC) and Oracle Data Guard
ODP.NET now cleans up the connection pool when the database down event is received from Oracle RAC or Oracle Data Guard. This is in addition to the events that ODP.NET already cleaned up the connection pool for: node down, service member down, and service down events.
Windows-Authenticated User Connection Pooling
Operating system-authenticated connections can now be managed as part of ODP.NET connection pools
See Also:"Operating System Authentication"
Connection Pool Performance Counters
ODP.NET publishes performance counters for connection pooling, which can be viewed using the Windows Performance Monitor.
See Also:"Connection Pool Performance Counters"
End-to-End Tracing Attribute Support
ODP.NET supports the
ModuleName write-only properties on the
OracleConnection object. These properties correspond to end-to-end tracing attributes that can be set on the client or middle-tier, and propagated to the database server whenever the next server round-trip happens. This reduces the added overhead associated with an independent database round trip. Using these attributes is helpful in tracking database user activities and debugging applications.
Oracle Data Provider for .NET release 11.1 includes the following:
The following performance enhancements have been made:
This release enhances the existing caching infrastructure to cache ODP.NET parameter contexts. This enhancement is independent of database version and it is available for all the supported database versions. This feature provides significant performance improvement for the applications that execute the same statement repeatedly.
This enhancement is transparent to the developer. No code changes are needed to use this feature.
When using LOBS or SecureFiles, this release improves the performance of small-sized LOB retrieval by reducing the number of round-trips to the database. SecureFiles is available with Oracle 11g release 1 or later database versions.
This enhancement is transparent to the developer. No code changes are needed to use this feature.
Oracle Data Provider for .NET release 10.2.0.4 includes the following:
Developers can now configure ODP.NET using configuration files, including application config,
Settings in the
machine.config override the registry settings.The settings in the application config or the
web.config override the values in the
Oracle Data Provider for .NET release 10.2.0.3 includes the following:
64-bit ODP.NET for Windows x64 and Windows Itanium
ODP.NET natively supports the 64-bit .NET Framework for both 64-bit Windows platforms:
Windows x64 for AMD64 and Intel EM64T processors
64-bit Windows for Intel Itanium
64-bit systems allow for more scalable and better performing ODP.NET applications.
FetchSize Through the Windows Registry
This feature enables applications to specify the default result set fetch size through the registry.
Local Transaction Support for
This feature enables
System.Transactions to use local transactions rather than distributed transactions. This can be specified either through the registry or through a connection string attribute.
Oracle Data Provider for .NET release 10.2.0.2 includes the following:
Support for Microsoft ADO.NET 2.0, including.
Provider Factory Classes and Base Classes
Simplifies data access code to access multiple data sources with a provider generic API.
Connection String Builder
Makes creating connections strings less error-prone and easier to manage.
Data Source Enumerator
Enables the application to generically obtain a collection of the Oracle data sources that the application can connect to.
Support for Schema Discovery
Permits application developers to find and return database schema information, such as tables, columns, and stored procedures.
ODP.NET supports implicit and explicit transactions using the
System.Transactions namespace models.
Batch Processing Support
Enables batch processing when the
OracleDataAdapter.Update method is called.
See Also:"ADO.NET 2.0 Features"
Oracle Data Provider for .NET release 10.2 includes the following:
Server-side features for Oracle Data Provider for .NET provide data access from .NET stored procedures. Such procedures are enabled by Oracle Database Extensions for .NET, a new feature included with Oracle database on Windows.
Support for Client Identifier
Oracle Data Provider for .NET exposes the
OracleConnection.ClientId property, thus providing support for Oracle Virtual Private Database (VPD) and application context. Client identifier makes configuring VPD simpler for the developer.
Connection Pool Optimizations for Oracle Real Application Clusters (Oracle RAC)
Oracle Data Provider for .NET optimizes connection pooling for Oracle RAC databases by balancing work requests across Oracle RAC instances, based on the load balancing advisory and service goal. Furthermore, the ODP.NET connection pool can be enabled to proactively free resources associated with connections that have been severed due to a down Oracle RAC service, instance, or node.
Database Change Notification Support
Oracle Data Provider for .NET provides a notification framework that supports Continuous Query Notification. This enables applications to receive notifications when there is a change in a query result set or a change in the state of the database.
Connection Pooling Management
Oracle Data Provider for .NET connection pool management provides explicit connection pool control to ODP.NET applications. Applications can explicitly clear connections in a connection pool or all the connection pools.
See Also:"Connection Pool Management"
Better LOB performance and functionality with Oracle Database 10g release 2 (10.2) and later
This feature enables applications to retrieve
Cursors from a PL/SQL procedure or function and pass them to another stored procedure or function.
Oracle Data Provider for .NET release 10.1.0.3 includes the following:
This feature provides and manages a cache of statements for each session. The developer can control which statements are cached and how many. This improves performance and scalability.
See Also:"Statement Caching"
.NET Framework 1.1 Enhancements
These enhancements expose new ADO.NET functionality that was introduced in Microsoft .NET Framework 1.1.
Support for Command Cancellation and Timeout
These two new features relate to command cancellation. The
CommandTimeout feature cancels the execution of a command when a specified amount of time elapses after the execution, while the
Cancel method can be called explicitly by the application to terminate the execution of a command.
This method populates the parameter collection for the
OracleCommand that represents a stored procedure or function by querying the database for the parameter information.
LOB Retrieval Enhancement
Entire LOB column data can be retrieved even if the select list does not contain a primary key,
ROWID, or unique key. This enhancement is available by setting the
InitialLOBFetchSize property value to
See Also:"Setting InitialLOBFetchSize to -1"
LONG Retrieval Enhancement
LONG column data can be retrieved even if the select list does not contain a primary key,
ROWID, or unique key. This enhancement is available by setting the
InitialLONGFetchSize property value to
See Also:"Setting InitialLONGFetchSize to -1"
Oracle Data Provider for .NET release 10.1 includes the following:
ODP.NET is grid-enabled, allowing developers to take advantage of Oracle Database Grid support without having to make changes to their application code.
BINARY_DOUBLE data types in the database
ODP.NET supports the new database native types
ODP.NET can be installed in Multiple Oracle Homes.
In order to make multiple homes available, some of the ODP.NET files include a version number, and the use of a
ID is required.
Support for Schema-Based
XMLType in the Database
ODP.NET supports the native schema-based
Oracle Data Provider for .NET release 18.104.22.168, which was released on Oracle Technology Network (OTN), included the following:
XML Support in ODP.NET
With XML support, ODP.NET can now:
Store XML data natively in the database as Oracle Database native type,
Access relational and object-relational data as XML data from an Oracle Database instance into a Microsoft .NET environment, process the XML using the Microsoft .NET Framework.
Save changes to the database using XML data.
See Also:"ODP.NET XML Support"
Support for PL/SQL Associative Array Binding
ODP.NET supports PL/SQL Associative Array (formerly known as PL/SQL Index-By Tables) binding.
An application can bind an
OracleParameter, as a PL/SQL Associative Array, to a PL/SQL stored procedure using
See Also:"PL/SQL Associative Array Binding"
InitialLOBFetchSize property on
See Also:"Obtaining LOB Data"