Some Very usefull Oracle Views

Oracle Views

dba_cons_columns		dba_constraints	dba_data_files
dba_ddl_locks		dba_errors	dba_extents
dba_free_space		dba_indexes	dba_jobs
dba_lock		dba_objects	dba_role_privs
dba_roles		dba_rollback_segs	dba_segments
dba_source		dba_tab_columns	dba_tables
dba_temp_files		dba_triggers	dba_ts_quotas
dba_undo_extents		dba_users	dba_mview_logs
dba_mview_refresh_times		dba_mviews	v$archived_log
v$asm_disk		v$backup_datafile	v$controlfile
v$database		v$datafile	v$db_cache_advice
v$filestat		v$instance	v$lock
v$locked_object		v$log	v$logfile
v$parameter		v$process	v$segment_statistics
v$session		v$session_longops	v$session_wait
v$sesstat		v$sort_usage	v$sqlarea
v$statname		v$sysstat	v$system_event
v$tempfile		v$transaction	dba_part_tables
dba_queues		dba_resumable	dba_tab_partitions