Using Cursors with Distributed Queries
When using cursors with distributed queries, both insensitive (static) and keyset-driven cursor types are supported when the provider supports the necessary OLE DB functionality. Dynamic or forward-only cursors requested with a distributed query are implicitly converted to keyset-driven cursors.
A keyset-driven cursor is supported on a distributed query if all local and remote tables in the query have a unique key. For the conditions under which a keyset cursor is supported on a distributed query, Keyset-driven Cursors Requirements for OLE DB Providers.
If a keyset-driven cursor is allowed on a distributed query, then it can also be used to update any of the underlying remote tables if the provider requirements for updatability are met. For the requirements for updates on a remote table, see UPDATE and DELETE Requirements for OLE DB Providers.