DBA_APPLY_INSTANTIATED_SCHEMAS displays information about schemas for which an instantiation SCN has been set.

Column Datatype NULL Description
SOURCE_DATABASE VARCHAR2(128) NOT NULL Name of the database where the schema originated
SOURCE_SCHEMA VARCHAR2(30)   Name of the schema at the source database
INSTANTIATION_SCN NUMBER   Instantiation SCN for the schema. Only changes committed after this SCN are applied by an apply process.
APPLY_DATABASE_LINK VARCHAR2(128)   Database link to which changes are applied. If null, then changes are applied to the local database.