These views provide information about tables, clusters, and views:
Lists all object and relational tables.
Lists all cluster keys.
Lists the hash values used for the optional cluster hash indexes.
Lists all clusters in the database.
Shows comments on all table and view columns.
Contains column information about analyzed columns. This is a subset of the information available in DBA_TAB_COLUMNS.
Shows all table and view columns.
Shows all comments on tables and views.
Shows all table histograms.
Shows all relational tables.
Lists columns in views with joins that can be updated.
Shows all views.