You now can specify the location of the centrally managed users (CMU) wallet and dsi.ora files for an individual PDB by using a database property on the PDB.
This enhancement enables a PDB administrator to specify a location to store these files rather than being limited by the sqlnet.ora WALLET_LOCATION parameter or having to use the default wallet locations. This feature works almost exactly as using WALLET_LOCATION or the default wallet location except that users with administrative privileges will not be able to start the database because directory objects are part of the database. To store the CMU wallet and dsi.ora files in the location path specified by a database directory object, you must set the CMU_WALLET database property to this directory object.
After you have set the CMU_WALLET database property to a directory object for an individual PDB, you should store the CMU wallet and dsi.ora files for this PDB in the location specified by the directory object, so that they can be accessed through the corresponding file systems.