Oracle Database Discussions

can any one suggest me the what is impact of

alter table tablename shrink space command.

i have space problem for that i have delete appr.5 corers records after deletion i now space is not deallocate

for that i have to shrink the table?

for that i have to enble row chaning .

after using this commnad space get release then i have to disable row chaninng or not

please suggest.

Thanks.