7/29/2019 DBAVIEWS
1/2
Oracle DBA Commonly Used Views
Oracle DBA Commonly Used Views
Below is a list of some of the views DBAs use to monitor a
database. A DBA can seewhat columns a particular view provides by
using the describe view SQL command.
Then you can limit which columns appear to the ones of interest
at the moment. You canalso limit the rows to the specific things of
interest. An example might be:select Owner, Tablespace_name,
Segment_Name, Extents as '# Extents',Max_Extents as 'Max Extents',
(Extents/Max_Extents)*100 as '% used'from DBA_SEGMENTSwhere Owner
not in ('SYS', 'SYSTEM')and Segment_type not in ('ROLLBACK',
'DEFERRED ROLLBACK', TEMPORARY')order by Tablespace_Name,
Owner;
Many of the DBA_ views shown in the table below have
corresponding USER_ viewsthat show similar information but for the
current user (schema) only. Likewise, the
various V$ views, which show information about the current
instance have matchingGV$ views, which show information about all
instances.The table below lists the views in three general
categories, resource managment views,performance monitoring views,
and security related views). Within each group the viewsare not
listed in any particular order however.
Views
View DescriptionSystem Resource ViewsUSER_ERRORS Displays the
errors found in views, stored procedures, and otherobjects.
DBA_TABLESPACES Provides information about each tablespace in
the database.DBA_USERS Provides information about each user in the
database.DBA_SOURCE Shows the source code for stored functions,
triggers, and Java objectsDBA_DATAFILES Gives information about the
datafiles.DBA_SEGMENTS Describes the storage usage for the segments
(the part of a datafilethat contains the physical storage for a
database object).DBA_EXTENTS More detailed information on space
used for segments. (Too manyextents per segment can take hours if
dropping the associated table. You can also checkthe next extent
size to make sure you have sufficient free space.)DBA_UNDO_EXTENTS
Used to monitor the space used for automatic undomanagement. (If
not using AUM you will have rollback segments instead, and the
view
to use for that is DBA_ROLLBACK_SEGS.)DBA_TABLES Lets the DBA
view information about any table.DBA_TAB_COLUMNS Provides detailled
information about each column of a table.DBA_INDEXES Show
information about table indexes; helps when trying to decide ifsome
index is useful or not. A related view is DBA_IND_COLUMNS which
tells whichcolumns of a table are indexed.DBA_CONSTRAINTS Lists the
restristions that have been placed on the contents ofcolumns of
tables and views. More detailed information comes from the related
view
7/29/2019 DBAVIEWS
2/2
DBA_CONS_COLUMNS.PRODUCT_COMPONENT\_VERSION Shows the current
versions of all installed components.Performance Monitoring
ViewsV$SYSSTAT Statistics such as the amount of data changed and
the number of
transactions executed.V$SQL The actual SQL commands recently
executed, how many time it was executedand how much CPU time it
took.V$SESSTAT Shows resources consumed per session. (Related:
V$SESSION_WAIT)V$FILESTAT The number of reads and writes per file,
and time spent on disk I/O.V$DATAFILE Lists the file number and
name for each DB file. In many views andtables Oracle identifies
files by the number rather than name.
(Related:V$DATAFILE_HEADER)V$DATABASE General information about the
databaseV$DBFILE Shows file name to numbersV$FIXED_TABLE Shows the
names of all dynamic tables and views.
V$INSTANCE General information about each instance.V$PARAMETER
Shows all the initializatino parameters and their current
values.V$SGA Summary statistics for the use of space in the
SGA.V$TEMPFILE Shows Statistics for locally-managed temporary
tablespace files.Security Related ViewsDBA_USERS Lists users who
can access a database.DBA_PROFILES List & Description of all
profiles in DBDBA_ROLES List of all roles in the DBDBA_ROLE_PRIVS
Roles assigned to usersDBA_SYS_PRIVS System Level Privileges for
usersDBA_TAB_PRIVS Object level privileges for usersDBA_TS_QUOTA
Which user has how much quota on tablespaceDBA_VIEWS Description of
all views in the DB
