My understanding that it is free if there is ONLY one PDB database in the CDB. >>> Hans Forbrich <fuzzy.graybeard@xxxxxxxxx> 6/6/14 8:22 AM >>> On 06/06/2014 5:20 AM, Niall Litchfield wrote: > Multi-tenant has been introduced as an extra cost option, and its an > option I think a reasonable number of customers, but by no means all > will pay for. Actually - multi-tenant *architecture* is NOT an extra cost option. I do believe that it will be the only variant in some future Patch Set or Release. From the online Licensing doc, at http://docs.oracle.com/cd/E16655_01/license.121/e17614/options.htm#DBLIC2166 "Oracle Multitenant includes the following feature: The ability to have up to 252 PDBs per multitenant container database *The multitenant architecture with one pluggable database (single tenant) is available in all editions without the Multitenant Option.*" There are other examples: Spatial is an option, but Locator, which has the same code, is not. Partitioning for use in your tables is an option, but Partitioning of the Data Dictionary is not. /Hans -- //www.freelists.org/webpage/oracle-l .