V$COMPATIBILITY

This view displays features in use by the database instance that may prevent downgrading to a previous release. This is the dynamic (SGA) version of this information, and may not reflect features that other instances have used, and may include temporary incompatibilities (like UNDO segments) that will not exist after the database is shut down cleanly.

Column	Datatype	Description
TYPE_ID	VARCHAR2(8	Internal feature identifier
RELEASE	VARCHAR2(60)	Release in which that feature appeared
DESCRIPTION	VARCHAR2(64)	Description of the feature