> For the complete documentation index, see [llms.txt](https://docs.tonic.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tonic.ai/app/setting-up-your-database/oracle/oracle-destination-schema-objects.md).

# Known limitations for Oracle schema objects

The following limitations apply when Tonic Structural creates the destination database:

* For Oracle advanced queues:
  * Structural does not copy messages from the source database to the destination database.
  * Structural does not copy queue subscribers to the destination database. You must add them to the destination database manually.
* In the destination database, Structural creates external tables as relational tables.
* Structural does not create database links in the destination database. You must create any required database links manually.

Structural also does not support nested tables.


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