From Oramosswiki
SET SERVEROUTPUT ON SIZE UNLIMITED
DECLARE
l_blkcnt_cmp PLS_INTEGER;
l_blkcnt_uncmp PLS_INTEGER;
l_row_cmp PLS_INTEGER;
l_row_uncmp PLS_INTEGER;
l_cmp_ratio PLS_INTEGER;
l_comptype_str VARCHAR2(2000);
BEGIN
dbms_compression.get_compression_ratio(scratchtbsname => 'STRMADMIN_SCHEMA'
,ownname => 'J4134'
,tabname => 'J4134_TABLES'
,partname => NULL
,comptype => 2
,blkcnt_cmp => l_blkcnt_cmp
,blkcnt_uncmp => l_blkcnt_uncmp
,row_cmp => l_row_cmp
,row_uncmp => l_row_uncmp
,cmp_ratio => l_cmp_ratio
,comptype_str => l_comptype_str
);
dbms_output.put_line('blkcnt_cmp: '||TO_CHAR(l_blkcnt_cmp));
dbms_output.put_line('blkcnt_uncmp: '||TO_CHAR(l_blkcnt_uncmp));
dbms_output.put_line('row_cmp: '||TO_CHAR(l_row_cmp));
dbms_output.put_line('row_uncmp: '||TO_CHAR(l_row_uncmp));
dbms_output.put_line('cmp_ratio: '||TO_CHAR(l_cmp_ratio));
dbms_output.put_line('comptype_str: '||TO_CHAR(l_comptype_str));
END;
/