ORA-10631: SHRINK clause should not be specified for this object

Question

Hi
I was trying to shrink table to reset the high water mark but some unknown reason it failed.
Please help me
SQL> declare
stmt varchar2(100);
cursor cur is
select object_name from user_objects where substr(object_name,1,1)='A'
and object_type='TABLE';
begin
for i in cur loop
stmt :='alter table '||i.object_name ||' shrink space';
execute immediate stmt;
end loop;
END;
declare
ERROR at line 1:
ORA-10631: SHRINK clause should not be specified for this object
ORA-06512: at line 9
Regards
Jewel

Answer 1

http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_3001.htm#CJA
The shrink clause lets you manually shrink space in a table, index-organized table or its overflow segment, index, partition, subpartition, LOB segment, materialized view, or materialized view log. This clause is valid only for segments in tablespaces with automatic segment management. By default, Oracle Database compacts the segment, adjusts the high water mark, and releases the recuperated space immediately.
Compacting the segment requires row movement. Therefore, you must enable row movement for the object you want to shrink before specifying this clause. Further, if your application has any rowid-based triggers, you should disable them before issuing this clause.