How to ID I/O to a tablespace?

Hey;
More on this 11g performance issue: I was told on the most recent (of very very many) teleconferences that the database is all but idle yet I'm seeing a significant amount of disk activity going to a specific filesystem. The I/O activity followed a tablespace move from one filesystem to another. This I/O activity is going on 24x7
So, while the dbas are playing around with the SGA, I'm interested in finding out what's hitting this tablespace when no one is supposed to be on the box...
Thanks for any hints/tips/suggestions.
Doug O'Leary

Hi,
you can see this link for more details about I/O in datafiles
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:7350114448818
Also use these statements to determine the physical Disk I/O performed on Tablespaces or Data Files
set pages 500 lines 110
clear col bre buffer
col tablespace_name format a15 hea 'TABLESPACE'
col file_name format a24 hea 'DATAFILE'
break on tablespace_name skip
select tablespace_name, regexp_replace(file_name,'^.*.\/.*.\/', '') file_name,
sum(phyrds) reads, sum(phywrts) writes, sum(phyrds)+sum(phywrts) total
from dba_data_files, v$filestat
where file_id=file# group by tablespace_name, file_name
order by tablespace_name, file_name;
:)

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I created a new user in a new Tablespace, Then export current user and import to new user(in new tablespace), but I found out that it was stored in previous Tablespace.
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Dear all,
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I try to import the partitioned tables in different tablespace.
Consider the following situation:
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Thanks

Hi,
If you want to find for all objects information, you can use dba_segments and filter this against the tablespace name. Once done you can create another tablespace and move the objects from old tablespace to new tablespace. Later you can drop the old tablepspace. You can use the below mention commands also:
SELECT 'ALTER TABLE '|| table_name ||' MOVE TABLESPACE USERS;'
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|| column_name ||') STORE AS (TABLESPACE USERS);'
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Mike...
Edited by: 896516 on Nov 10, 2011 1:05 PM

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Hi,
I have a limited access to objects in my database ( do not have access to many tables).
I have been allocated 300GB of size in my tablespace which allows me to create my objects.
Now, I want to find out how much of this tablespace size allocated to me have been used up. I do not have access to dba_data_files or dba_segments.
Is there a way out for me? Could anyone show me a way please?

This query will give you the required information but it makes use of DBA tables.
SELECT B.TABLESPACE_NAME, TBS_SIZE SIZEGB, A.FREE_SPACE FREEGB
from (select tablespace_name, round(sum(bytes)/1024/1024/1024 ,2) as free_space
       from dba_free_space
       GROUP BY TABLESPACE_NAME) A,
      (select tablespace_name, sum(bytes)/1024/1024/1024 as tbs_size
       from dba_data_files
       group by tablespace_name) b
where a.tablespace_name(+)=b.tablespace_name;
However, you said that you are aware of your tablespace details so the above query can be modified to get the free space in your tablespace. Now I am using user_frees_space and not dba_free_space. Generally user* tables are and should be made accessible to the users.
select tablespace_name, round(sum(bytes)/1024/1024/1024 ,2) as free_space
from    user_free_space
where   tablespace_name = 'Your tablespace name'
GROUP BY TABLESPACE_NAME;
Ishan

How do you list tables within the tablespace?

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select owner, table_name
from user_tables -- or all_tables, or dba_tables
where tablespace_name = :ts_name;

How to reduce the size of SYSTEM tablespace?

* Solaris
* Oracle 9.2.0.4.0
* Locally managed database (since SYSTEM is locally managed TS)
I have a Oracle 9i database with is around 7 months old. Over the 7 months it had around 400 schemas at most and SYSTEM tablespace was increased to 850MB. Now it only has around 120 schemas and size of the SYSTEM tablespace still 850MB and its 99% used.
How can I get more free space on system tablespace?
* I have made sure that non-sys(tem) user dont have objects on SYSTEM tablespace.
* I understand that dropping schema does not give you all the space back, since objects are store as row in System tables etc.
Increasing disk is not an option for me. Any tips to free space on system welcome.
Thanks,
Nazrul Islam

Thanks Joel Pérez for trying to help.
SQL> select segment_name, owner from
dba_segments
where owner not in
('SYS','SYSTEM','OUTLN','MDSYS','ORDSYS','WMSYS')
and
TABLESPACE_NAME='SYSTEM';
SEGMENT_NAME                   OWNER
TOAD_PLAN_SQL                  TOAD
TOAD_PLAN_TABLE                TOAD
PLSQL_PROFILER_RUNS            TOAD
PLSQL_PROFILER_UNITS           TOAD
PLSQL_PROFILER_DATA            TOAD
TPSQL_IDX                      TOAD
TPTBL_IDX                      TOAD
SYS_C006895561                 TOAD
SYS_C006895563                 TOAD
SYS_C006895566                 TOAD
10 rows selected.
SQL> select owner from dba_segments where
tablespace_name='SYSTEM'
group by owner;
OWNER
OUTLN
SYS
SYSTEM
TOAD
WMSYSHere is my query (to show TOAD is taking very little
space):r.- That is true, the space used by TOAD is little
>
SQL> select owner, SUM(bytes)/1048576 AS "TOTAL
(MB)"
from dba_segments
where tablespace_name = 'SYSTEM'
group by owner order by "TOTAL (MB)" desc;
OWNER                 TOTAL (MB)
SYS                     820.4375
SYSTEM                      20.5
WMSYS                     3.6875
TOAD                       .6875
OUTLN                       .375Looks like, I have to grow system. Or since I have a
fixed number of schema now, I think I will have to
recreate a DB to reduce SYSTEM size.
Joel one other info that might explain why
this happening. Part of our build process is to drop
4 schemas and roles and recreate them.
e.g.
drop user nislam cascade;
create user nislam ....And we do many builds a day. Maybe Oracle uses more
space in doing that since new userid, better might be
drop objects from the schema. WHAT do you
say?
r.- In theorical lines. Both must give the same results but... I would recommend you to carry out some intensive test about it in a test enviroment testing both methods to monitor the behavior of the growth of the tablespace system. As you said, perhaps dropping the user objects will get better results.
>
Regards,
Nazrul IslamJoel Pérez
http://otn.oracle.com/experts

How to reduce the size of exising tablespace?

Hi,
I assigned 2GB dbsize to a tablespace.
Now I would like to reduce the table space to 1GB.
The tablespace used is 60MB.
When I try to reduce the size to 1GB its showing a message as follows.
"ORA-03297: file contains used data beyond requested RESIZE value".
Even I truncated all the data from all tables to which this table space is allocated. However, its not allowing me to resize it.
How can I do this? Is there any other way to do this?
Thank you,
Regards,
Gowtham Sen.

You may not be able to reduce the size of your datafile just by truncating tables. It does not matter if it is 9i or 10g. TRUNCATE just resets the high watermark of your tables, it leaves the first extent in place. So if you have tables whose first extents reside in the last part of a datafile you cannot resize it below that level.
See this:
SQL> create tablespace test2 datafile size 10m autoextend off;
Tablespace created.
SQL> create table t1 tablespace test2 as select * from all_objects;
Table created.
SQL> insert into t1 select * from t1;
insert into t1 select * from t1
ERROR at line 1:
ORA-01653: unable to extend table YAS.T1 by 128 in tablespace TEST2
SQL> create table t2(a number) tablespace test2;
Table created.
SQL> r
1 select segment_name,file_id,block_id,blocks from dba_Extents
2* where TABLESPACE_NAME='TEST2'
SEGMENT_NA    FILE_ID   BLOCK_ID     BLOCKS
T1                  9          9          8
T1                  9         17          8
T1                  9         25          8
T1                  9         33          8
T1                  9         41          8
T1                  9         49          8
T1                  9         57          8
T1                  9         65          8
T1                  9         73          8
T1                  9         81          8
T1                  9         89          8
SEGMENT_NA    FILE_ID   BLOCK_ID     BLOCKS
T1                  9         97          8
T1                  9        105          8
T1                  9        113          8
T1                  9        121          8
T1                  9        129          8
T1                  9        137        128
T1                  9        265        128
T1                  9        393        128
T1                  9        521        128
T1                  9        649        128
T1                  9        777        128
SEGMENT_NA    FILE_ID   BLOCK_ID     BLOCKS
T1                  9        905        128
T1                  9       1033        128
T2                  9       1161          8As you can see we now have an extent in block 1161 of this datafile.
Let's try to resize it to half.
SQL> select file_name from dba_data_files
2 where TABLESPACE_NAME='TEST2';
FILE_NAME
/disk1/oradata/10G/datafile/o1_mf_test2_3qpzcz0z_.dbf
SQL> alter database datafile '/disk1/oradata/10G/datafile/o1_mf_test2_3qpzcz0z_.dbf' resize 5m;
alter database datafile '/disk1/oradata/10G/datafile/o1_mf_test2_3qpzcz0z_.dbf' resize 5m
ERROR at line 1:
ORA-03297: file contains used data beyond requested RESIZE valueTruncate the tables and try again.
SQL> truncate table t1;
Table truncated.
SQL> truncate table t2;
Table truncated.
SQL> alter database datafile '/disk1/oradata/10G/datafile/o1_mf_test2_3qpzcz0z_.dbf' resize 5m;
alter database datafile '/disk1/oradata/10G/datafile/o1_mf_test2_3qpzcz0z_.dbf' resize 5m
ERROR at line 1:
ORA-03297: file contains used data beyond requested RESIZE valueThe reason is:
SQL> r
1 select segment_name,file_id,block_id,blocks from dba_Extents
2* where TABLESPACE_NAME='TEST2'
SEGMENT_NA    FILE_ID   BLOCK_ID     BLOCKS
T1                  9          9          8
T2                  9       1161          8We have an extent at block 1161. Because of that we cannot reduce the size to 5M.
Let's move the table and try again.
SQL> alter table t2 move tablespace test2;
Table altered.
SQL> r
1 select segment_name,file_id,block_id,blocks from dba_Extents
2* where TABLESPACE_NAME='TEST2'
SEGMENT_NA    FILE_ID   BLOCK_ID     BLOCKS
T1                  9          9          8
T2                  9         17          8
SQL> alter database datafile '/disk1/oradata/10G/datafile/o1_mf_test2_3qpzcz0z_.dbf' resize 5m;
Database altered.Message was edited by:
Yas

How to import the data into another Tablespace?

I have a Oracle user USER1 with default tablespace on "SYSTEM" tablespace.
I export utility to export user1's object with "exp" utility:
c:\orawin95\bin> exp userid=USER1/pwd file=DATA.dmp owner=user1
Now I upgrade my Hardware Server and reinstall Oracle, I created USER1 again but change default tablespace to "NewTS".
I use import utility to import data.dmp into user1 :
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See
Considering user = USER1 and default tablespace for user1 is SYSTEM.
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spool cr.sql
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spool off
remove garbage lines from cr.sql
3. login in User2 ( where default table space is NEWTS )
SQL> @cr.sql
4. login to user1 drop all the tables from user1
login to system alter user user1 make default tablespace NEWTS
login to user2 run script in step 2 again.
login to user1 run cr.sql
login to user2 drop all the tables;
login to system drop user user2.
Hope this will solve your purpose
Thanks and Regards
Ripudaman

How to ID I/O to a tablespace?

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