Ewok wrote:
> Nice. So it's only possible with MySQL and MS SQL Server data sources?

That depends on your definition of a database :-) If you look 
carefully at what MySQL calls a database you will see that it is 
actually not a database but a schema and all that is implemented 
is cross-schema queries (ch. 22 of the manual).

Oracle can do cross database queries through dblink, but the 
query will not run in one transaction across both databases. 
PostgreSQL has a dblink feature similar to Oracle's.
Does anybody know if queries against MS SQL Server linked servers 
run in one transaction?


Someday SQL-MED (Management of External Data) might make it 
possible to include a MS SQL Server database from a query on an 
Oracle database. 2038 sounds about right for that :-)

Jochem

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