Oracle Tablespace issue

Question

Hi,
I am having problem with one of our tablespace. I receive a error message saying unable to extent tablespace very often, even though we have enough space in tablespace, And i also observerd that max(bytes) in dba_free_Space is decreasing everyday. We have oracle 11g and tablespaces are locally manged with ASSM.
Space in our tablespace is as follows:
TSName Tot_Size Tot_free PCT_free Max_Free Chunk_Free
User 44,746,932,224 3,656,908,800 8 1,966,080 4,668
I get the above result when i execute the following query:
select a.tablespace_name,sum(a.tots) Tot_Size,
sum(a.sumb) Tot_Free,
sum(a.sumb)*100/sum(a.tots) Pct_Free,
sum(a.largest) Max_Free,sum(a.chunks) Chunks_Free
from
select tablespace_name,0 tots,sum(bytes) sumb,
max(bytes) largest,count(*) chunks
from dba_free_space a
group by tablespace_name
union
select tablespace_name,sum(bytes) tots,0,0,0 from
dba_data_files
group by tablespace_name) a
group by a.tablespace_name;
Why is the Max_free very less and it keep decreasing daily. I tried to shrink tables and rebuild indexes to gain some space , nothing helped. Can anyone help me if i am missing anything here ? And also please let me know if you need more information
Thanks for your time.

Answer 1

I have read the SAP notes suggested by Alpesh and Harleen. I spoke to the Database admin regarding the following tables for re-organization:
Tables: VIRSA_CC_ACTVL
            VIRSA_CC_BKGINP
            VIRSA_CC_JOBHST
            VIRSA_CC_PRMVL
            VIRSA_CC_SCHEDULER
            VIRSA_CC_THREAD
He said that it will save around 4Gb only.
Can you tell me if by setting the following thing in CC>Config>"Additional Options"
Enable Offline Risk Analysis   - No
Will we be able to save up space? Our main concern is not to increase further the size because of cost issues. We already increased the size twice earlier. The system was designed as per the sizing guidelines earlier. Thhanks both.
Thanks for your reply Sudip as well...We will configure automatic addition of tablespace soon after we resolve this issue....
Regards,
Venkateswara Rao