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Delphix

Considerations When Upgrading Oracle Sources to 12c Multitenant (KBA1857)

 

KBA

KBA#1857

Issue

When upgrading to Oracle 12c databases may optionally be converted to multitenant database. When this is done, the database will be converted to a Pluggable Database and attached to a CDB.  

The Delphix Engine does not support migrating an existing dSource from a non multitenant database to a multitenant database. Due to this any dSource which has been converted as part of an upgrade must be unlinked then re-imported to Delphix, as if it was a new database. For general process of upgrading dSources see Upgrading dSources after an Oracle Upgrade.

The following issues may arise from this process.

  • VDBs created from 11g non multitenant dSource will need to be recreated against the 12c multitenant dSource.
  • Self-Service configurations will need to be rebuilt against 12c multitenant dSource.
  • Bookmarks created against 11g dSource/VDBs will not be compatible with 12c dSource/VDBs.
  • It will not be possible to rewind/refresh across the migration.

As these limitations exist, any migration to multitenant sources must be carefully planned to ensure continuity of service for VDBs, especially if Self-Service is being used. Delphix recommends the following process 

  • Unlink dSource database.
    VDBs will continue to operate as before, however it will only be able to refresh up to the latest fetched archive log.
  • Upgrade source database as per instructions from Oracle.
  • Refresh source Environment.
    This should discover the new 12c Multitenant dSource.
  • Link new PDB dSource as per, see Linking an Oracle Pluggable Database
  • When VDBs are ready to be refreshed, they should either be deleted (this will remove all snapshot ) or recreated.
    If VDB snapshots must be maintained, then stop the existing VDB and create a new VDB.
  • If Self-Service is being used, then create a new configuration for the Multitenant database and move uses to the new configuration as required.