This is a list of the Oracle DBA views and I have tried to include definitions and examples of the use of the DBA view inside scripts:

DBA_2PC_NEIGHBORS

DBA_2PC_PENDING

DBA_ALL_TABLES

DBA_ANALYZE_OBJECTS

DBA_AUDIT_EXISTS

DBA_AUDIT_OBJECT

DBA_AUDIT_SESSION

DBA_AUDIT_STATEMENT

DBA_AUDIT_TRAIL

DBA_CATALOG

DBA_CLUSTERS

DBA_CLUSTER_HASH_EXPRESSIONS

DBA_CLU_COLUMNS

DBA_COLL_TYPES

DBA_COL_COMMENTS

DBA_COL_PRIVS

DBA_CONSTRAINTS

DBA_CONS_COLUMNS

DBA_CONTEXT

DBA_DATA_FILES

DBA_DB_LINKS

DBA_DIMENSIONS

DBA_DIM_CHILD_OF

DBA_DIM_HIERARCHIES

DBA_DIM_JOIN_KEY

DBA_DIM_LEVELS

DBA_DIM_LEVEL_KEY

DBA_DIRECTORIES

DBA_ERRORS

DBA_EXP_FILES

DBA_EXP_OBJECTS

DBA_EXP_VERSION

DBA_EXTENTS

DBA_FREE_SPACE

DBA_FREE_SPACE_COALESCED

DBA_FREE_SPACE_COALESCED_TMP1

DBA_FREE_SPACE_COALESCED_TMP2

DBA_FREE_SPACE_COALESCED_TMP3

DBA_HISTOGRAMS

DBA_INDEXES

DBA_IND_COLUMNS

DBA_IND_EXPRESSIONS

DBA_IND_PARTITIONS

DBA_IND_SUBPARTITIONS

DBA_INTERNAL_TRIGGERS

DBA_JOBS

DBA_JOBS_RUNNING

DBA_LIBRARIES

DBA_LOBS

DBA_LOB_PARTITIONS

DBA_LOB_SUBPARTITIONS

DBA_METHOD_PARAMS

DBA_METHOD_RESULTS

DBA_MVIEW_AGGREGATES

DBA_MVIEW_ANALYSIS

DBA_MVIEW_DETAIL_RELATIONS

DBA_MVIEW_JOINS

DBA_MVIEW_KEYS

DBA_NESTED_TABLES

DBA_OBJECTS

DBA_OBJECT_SIZE

DBA_OBJECT_TABLES

DBA_OBJ_AUDIT_OPTS

DBA_OUTLINES

DBA_OUTLINE_HINTS

DBA_PARTIAL_DROP_TABS

DBA_PART_COL_STATISTICS

DBA_PART_HISTOGRAMS

DBA_PART_INDEXES

DBA_PART_KEY_COLUMNS

DBA_PART_LOBS

DBA_PART_TABLES

DBA_PENDING_TRANSACTIONS

DBA_POLICIES

DBA_PRIV_AUDIT_OPTS

DBA_PROFILES

DBA_QUEUES

DBA_QUEUE_SCHEDULES

DBA_QUEUE_TABLES

DBA_RCHILD

DBA_REFRESH

DBA_REFRESH_CHILDREN

DBA_REFS

DBA_REGISTERED_SNAPSHOTS

DBA_REGISTERED_SNAPSHOT_GROUPS

DBA_REPAUDIT_ATTRIBUTE

DBA_REPAUDIT_COLUMN

DBA_REPCAT

DBA_REPCATLOG

DBA_REPCOLUMN

DBA_REPCOLUMN_GROUP

DBA_REPCONFLICT

DBA_REPDDL

DBA_REPFLAVORS

DBA_REPFLAVOR_COLUMNS

DBA_REPFLAVOR_OBJECTS

DBA_REPGENERATED

DBA_REPGENOBJECTS

DBA_REPGROUP

DBA_REPGROUPED_COLUMN

DBA_REPGROUP_PRIVILEGES

DBA_REPKEY_COLUMNS

DBA_REPOBJECT

DBA_REPPARAMETER_COLUMN

DBA_REPPRIORITY

DBA_REPPRIORITY_GROUP

DBA_REPPROP

DBA_REPRESOLUTION

DBA_REPRESOLUTION_METHOD

DBA_REPRESOLUTION_STATISTICS

DBA_REPRESOL_STATS_CONTROL

DBA_REPSCHEMA

DBA_REPSITES

DBA_RGROUP

DBA_ROLES

DBA_ROLE_PRIVS

DBA_ROLLBACK_SEGS

DBA_RSRC_CONSUMER_GROUPS

DBA_RSRC_CONSUMER_GROUP_PRIVS

DBA_RSRC_MANAGER_SYSTEM_PRIVS

DBA_RSRC_PLANS

DBA_RSRC_PLAN_DIRECTIVES

DBA_RULESETS

DBA_SEGMENTS

DBA_SEQUENCES

DBA_SNAPSHOTS

DBA_SNAPSHOT_LOGS

DBA_SNAPSHOT_LOG_FILTER_COLS

DBA_SNAPSHOT_REFRESH_TIMES

DBA_SOURCE

DBA_STMT_AUDIT_OPTS

DBA_SUBPART_COL_STATISTICS

DBA_SUBPART_HISTOGRAMS

DBA_SUBPART_KEY_COLUMNS

DBA_SUMMARIES

DBA_SUMMARY_AGGREGATES

DBA_SUMMARY_DETAIL_TABLES

DBA_SUMMARY_JOINS

DBA_SUMMARY_KEYS

DBA_SYNONYMS

DBA_SYS_PRIVS

DBA_TABLES

DBA_TABLESPACES

DBA_TAB_COLUMNS

DBA_TAB_COL_STATISTICS

DBA_TAB_COMMENTS

DBA_TAB_HISTOGRAMS

DBA_TAB_MODIFICATIONS

DBA_TAB_PARTITIONS

DBA_TAB_PRIVS

DBA_TAB_SUBPARTITIONS

DBA_TEMP_FILES

DBA_TRIGGERS

DBA_TRIGGER_COLS

DBA_TS_QUOTAS

DBA_TYPES

DBA_TYPE_ATTRS

DBA_TYPE_METHODS

DBA_UNUSED_COL_TABS

DBA_UPDATABLE_COLUMNS

DBA_USERS

DBA_VARRAYS

DBA_VIEWS

DICT

DICTIONARY

DICT_COLUMNS

DUAL