ALL_BASE_TABLE_MVIEWS
describes all materialized views using materialized view logs accessible to the current user. A materialized view log can be created for a master or base table or a master materialized view. Query this view at the master site or the master materialized view site to show one row for each materialized view using a materialized view log.
Related Views
DBA_BASE_TABLE_MVIEWS
describes all materialized views using materialized view logs in the database.
USER_BASE_TABLE_MVIEWS
describes all materialized views using materialized view logs owned by the current user.