How to shrink the system tablespace datafile Size

Question

iam using oracle 9i R2 and i want to reduce my datafile size but it's show's that error when i try to resize it. ORA-03297

Answer 1

Hi,
We can directly resize datafilesTEST.SQL>SELECT FILE_NAME, BYTES FROM DBA_DATA_FILES WHERE TABLESPACE_NAME='SYSTEM';
FILE_NAME
     BYTES
/.../dbsGNX.dbf
419430400
TEST.SQL>ALTER DATABASE DATAFILE '/.../dbsGNX.dbf' RESIZE 390M;
Database altered.
TEST.SQL>SELECT FILE_NAME, BYTES FROM DBA_DATA_FILES WHERE TABLESPACE_NAME='SYSTEM';
FILE_NAME
     BYTES
/.../dbsGNX.dbf
408944640But the minimum file size is the size of the extend the furthest in the datafile:TEST.SQL>SELECT FILE_ID,FILE_NAME FROM DBA_DATA_FILES WHERE TABLESPACE_NAME='SYSTEM';
   FILE_ID
FILE_NAME
         1
/.../dbsGNX.dbf
TEST.SQL>SELECT MAX(BLOCK_ID) MBID FROM DBA_EXTENTS WHERE FILE_ID=1;
      MBID
     25129
TEST.SQL>SELECT SEGMENT_NAME,OWNER,SEGMENT_TYPE FROM DBA_EXTENTS WHERE FILE_ID=1 AND BLOCK_ID=25129;
SEGMENT_NAME                                                                      OWNER                          SEGMENT_TYPE
I_OBJAUTH2                                                                        SYS                            INDEX
TEST.SQL>SHOW PARAMETER BLOCK_SIZE
NAME                                 TYPE                             VALUE
db_block_size                        integer                          8192
TEST.SQL>SELECT 8192*25129 FROM DUAL;
8192*25129
205856768about 200M.
Regards,
Yoann.