How to shrink tablespace size if there is more unused space ??

i have a tablespace it's size has increased upto 800MB but only 200MB is used, how can i minimize this gap b/w actual size and used size.
i think i may have wrongly set the autoextent parameter.
Please help

You said is has increased upto 800M , but only used 200MB?
How it is possible? Tablespace size increases to accomodate space for new data.
Is it possible that data might have deleted?
Use the following command to resize the datafile. If the HWM is set to higher than this, the command will with an errors.
RROR at line 1:
RA-03297: file contains used data beyond requested RESIZE value
Syntax:
ALTER DATABASE DATAFILE 'tools01.dbf' RESIZE 250m;
Jaffar

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ARCHDATA                       |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX      |
DATBIGGX                       |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                  |
DATGX                          |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                                                      |
DATLOWGX                       |XXXXXXXXXXXXXXXXXXXXXX                                                                             |
IDXBIGGX                       |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                 |
IDXLGX                         |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                |
IDXGX                          |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX          |
LOGMNRTS                       |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                                           |
SYSTEM                         |XXXXXXXXXXXXXXXX                                                                                   |
TOOLS                          |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                                                   |
UNDOGX                         |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                                         |Yoann.

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RLUO wrote:
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Message was edited by:
OracleJavaLinux

hi
do one thing create new tablespace like TEST move table by table to that and viseversa
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alter table emp move tablespace TEST;
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after this rebuild all indexes on that tables
alter index <index_name> rebuild;
By this action u can recover unused space by the tables
Message was edited by:
BhanuChander

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