Why can they take default permanent tablespace offline?

We cannot take the tablespace temporary default offline, as well as of the SYSTEM, UNDOTBS1.
so, I wonder why we take offline the permanent tablespace default as USERS?
What happens if there is only a single tablespace 'USERS' in my database?

PhoenixBai wrote:
>
Why do you have to be obsessed to take tablespaces offline?
>
not me obsessed to this topic. OCP tends to make a fuss out of it, so I have no choice, but to play the game.

back to the point, the original question is:

Your Oracle 10g database has 6 tablespaces in which:
-TEMP is the default temporary tablespace
- UNDOTBS1 is the default undo tablespace
- USERS is the default permanent tablespace
In this database, which three tablespaces can  be made offline? (Choose three.)

1. USERS
2. TEMP
3. UNDOTBS1
4. SYSTEM
5. SYSAUX
6. PROD

responses, are without a doubt, 1,5,6. and I have no problem seen the SYSTEM may not be in offline mode.
but, do not understand why TEMP and UNDOTBS1 isn't in offline mode while USERS can?
for me, TEMP & UNDOTBS1 are to serve the manipulation on the data that is contained in the USERS (or PROD) tablespaces in this case.
Thus, when data are not available, what is the point to keep TEMP & UNDOTBS1?

Another possibility is: we are allowed to disconnect USERS tablespace, because currently we have an another PROD tablespace to store data?

want you or anyone can help explain a little.
I just want one another reasonable explanation that oracle doc said.

Phonexbai,

Please see,

SQL> l
  1  select * from database_properties
  2* where property_name like '%DEFAULT%'
SQL> /

PROPERTY_NAME                                      PROPERTY_VALUE                                     DESCRIPTION
-------------------------------------------------- -------------------------------------------------- ----------------------------------------------
DEFAULT_TEMP_TABLESPACE                            TEMP                                               Name of default temporary tablespace
DEFAULT_PERMANENT_TABLESPACE                       USERS                                              Name of default permanent tablespace
DEFAULT_EDITION                                    ORA$BASE                                           Name of the database default edition
DEFAULT_TBS_TYPE                                   SMALLFILE                                          Default tablespace type

SQL> select * from V$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0      Production
TNS for 32-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production

SQL> archive log list
Database log mode              No Archive Mode
Automatic archival             Disabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     71
Current log sequence           73
SQL> alter tablespace users offline ;

Tablespace altered.

SQL> alter tablespace users online;

Tablespace altered.

For the first thing, the declaration this tablespace users may be taken offline is indeed correct . Now the System and Sysaux are containing the data dictionary of the database and without whom, there is no point that this database can work. This is why its mandatory for them to be online and if off line by crushing or something, the recovery of them must also occur in the phase (Mount) offline.

The Undo tablespace is required to service the mechanism of reading-consistansy of the database. If quoted to be mandatory (i.e. your AUM), it cannot be taken offline and being crushed, his recovery would be as necessary a restoration in offline mode. The Temp tablespace is a special tablespace (he was't it always in all previous versions) for the database and if it's a must for the datbase for read-only and do something that will exceed PGA. So it cannot be disconnected as well.

Now, I'm sure you mean you know all this, what about users being able to get offline, right? Well, the answer is quite simple. Everything simply because you establish a default tablespace for the user be available as their default tablespace (further a quota to spread on it), it does not change any property of this tablespace. Its the tablespace, unlikely normal Temp, cancel and so on. He did justto do that people do not, by mistake, make objects in the System tablespace. A tablespace of default tablespace of the user database for the creation of objects, does not mean that all of a sudden, its now taking a special meaning. That is why its possible to redo this tablespace still transactions that apply to any other tablespace (by default) with the exception of the system those. I don't think to dig any deeper. There is no other explanation that it is possible for this behavior of the IMO.

HTH
Aman...

Tags: Database

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