Hi,

>    can I be sure that only one copy of JDBC driver will be loaded ?
> Yes it's, my question is if there are some specialized ClassLoader for
> isolation of  connection/JdbcDriver in a per table basis (like WebSphere
> does for  conectors).

There is no such feature. There is however a way to use a data source
instead of a JDBC driver:

To use JNDI to get the connection, the driver class must be a
javax.naming.Context (for example javax.naming.InitialContext), and
the URL must be the resource name (for example
java:comp/env/jdbc/Test).

Example:
CREATE LINKED TABLE LINK('javax.naming.InitialContext',
  'java:comp/env/jdbc/Test', NULL, NULL, '(SELECT * FROM TEST WHERE ID>0)');

I will document that in the next release.

Regards,
Thomas

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