Oracle Get Definition Of Private Temporary

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Oracle 18c introduced the concept of a private temporary table, a memory-based temporary table that is dropped at the end of the session or transaction depending on the setup.
If you've come to Oracle from a different database engine, like SQL Server, you might be confused by Oracle's idea of temporary tables. In SQL Server developers will regularly create a temporary table to do some work and drop it. In Oracle a Global Temporary Table (GTT) is a permanent metadata object that holds rows in temporary segments on a transaction-specfic or session-specific basis. It is not considered normal to create and drop GTTs on the fly. With the introduction of private temporary tables, Oracle has an option similar to that seen in other engines, where the table object itself is temporary, not just the data.
Oracle support two types of temporary tables.
The PRIVATE_TEMP_TABLE_PREFIX initialisation parameter, which defaults to "ORA$PTT_", defines the prefix that must be used in the name when creating the private temporary table. In the following example we create a private temporary table without using the correct prefix in the name, which results in an error.
The syntax for creating a private temporary table will look familiar if you have used global temporary tables.
The ON COMMIT DROP DEFINITION clause, the default, indicates the table should be dropped at the end of the transaction, or the end of the session.
In contrast, the ON COMMIT PRESERVE DEFINITION clause indicates the table and any data should persist beyond the end of the transaction. The table will be dropped at the end of the session.
The above output shows the table persists beyond the commit, but is dropped when we disconnect and create a new session.
We can also create private temporary tables using the CTAS method.
It doesn't make sense for a permanent PL/SQL object to directly reference a temporary object, as it would not exist at compile time. If you want to use a private temporary table from a permanent object it would have to be done using dynamic SQL. The following silly example creates a stored function which uses a private temporary table.
Private temporary tables are memory-based, so there is no metadata recorded in the data dictionary. As a result you can't use the USER_TABLES view to display the list of private temporary tables in the current session. The following views are available to display information about private temporary tables.
Private temporary tables share the limitations of global temporary tables (see here), but there are also additional restrictions.
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