.. include:: /../getting_started/vars.rst

.. _section-Product-Core-611:

RTI Connext Core Libraries
**************************
Note the following information when migrating from Release 6.1.0 to Release 
6.1.1 or 6.1.2. Remember to regenerate and recompile your code, even if you do 
not make application changes. See :numref:`section-gen-compile`.


.. _section-MG-148:

Removed ability to share a database connection in Persistence Service and durable writer history
================================================================================================
As described in :link_whats_new_612:`What's New in 6.1.2 <>`, release 6.1.2 
removes the ability to share a database connection in *RTI Persistence Service* 
(which was done by setting the tag ``<share_database_connection>`` to true for a 
``<persistence_group>``). It also removes the ability to share a database 
connection when using durable writer history and setting the property 
``dds.data_writer.history.odbc_plugin.shared`` to 1.

Note that sharing a database connection was only allowed for external databases, 
and support for external databases was deprecated in release 6.1.1 
(see :link_connext_whats_new_611:`What's New in 6.1.1 <>`).


Upgrading Your C# Projects
==========================
A new C# API was introduced in release 6.1.0. 
(See :ref:`section-Product-api-csharp`.) In that release, the binding was 
distributed as a separate RTI package and via the NuGet package manager. 
Starting in release 6.1.1, the new C# API is included with |CONNEXT|.

Therefore, starting in release 6.1.1, see :ref:`section-product-csharp-612` to
upgrade your existing C# projects to the new |CONNEXT| version.


.. _section-product-cstq-612:

TopicQuery not Supported in C# API
==================================
TopicQueries are not supported in the new C# API. Support for them will be 
added in a future release. 

See :link_connext_whats_new_611:`What's New in 6.1.1 <>` for more information 
on the C# API in 6.1.1.