To shrink the size of TEMP tablespace
Dear all,
There is a databse with RAC, now in OEM the size of TEMP tablespace has been reached at 99.9%. now we want to shrink the size of TEMP tablespace.
how to we do that???????
plz help me...........
Temporary tablespaces usually show they are full, however this space is not actually in use. It is rather allocated. Oracle has evaluated the best way to obtain the most of performance, and he said it is better to allocate once than allocate-deallocate-reallocate extents, so temporary space is not 'released'.
If you want to feel psychologically more confortable with lower allocated space, you can drop your tablespace (create an interim default temporary tablespace first) and recreate it.
You can also rebuild temporary datafiles:
alter tablespace temp add tempfile 'C:\ORACLE\ORACLEXE\ORADATA\XE\TEMP01.dbf' size 32m;
SQL> select name from v$tempfile;
NAME
C:\ORACLE\ORACLEXE\ORADATA\XE\TEMP.DBF
C:\ORACLE\ORACLEXE\ORADATA\XE\TEMP01.DBF
SQL> alter database tempfile 'C:\ORACLE\ORACLEXE\ORADATA\XE\TEMP01.DBF' drop including datafiles;
Database altered.
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SQL> create tablespace test2 datafile size 10m autoextend off;
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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
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