V$MVREFRESH displays information about the materialized views currently being refreshed.

Column Datatype Description
SID NUMBER Session identifier
SERIAL# NUMBER Session serial number, which is used to uniquely identify a session's objects. Guarantees that session-level commands are applied to the correct session objects if the session ends with, and another session begins with, the same session ID.
CURRMVOWNER VARCHAR2(31) Owner of the materialized view currently being refreshed. The materialized view resides in this user's schema.
CURRMVNAME VARCHAR2(31) Name of the materialized view currently being refreshed