SELECT
owner, table_name, TRUNC(sum(bytes)/1024/1024) MB
FROM
(SELECT segment_name table_name, owner, bytes
FROM dba_segments
WHERE segment_type in (‘TABLE’,’TABLE SUBPARTITION’,’TABLE PARTITION’)
UNION ALL
SELECT i.table_name, i.owner, s.bytes
FROM dba_indexes i, dba_segments s
WHERE s.segment_name = i.index_name
AND s.owner = i.owner
AND s.segment_type in (‘INDEX’,’INDEX SUBPARTITION’,’INDEX PARTITION’)
UNION ALL
SELECT l.table_name, l.owner, s.bytes
FROM dba_lobs l, dba_segments s
WHERE s.segment_name = l.segment_name
AND s.owner = l.owner
AND s.segment_type = ‘LOBSEGMENT’
UNION ALL
SELECT l.table_name, l.owner, s.bytes
FROM dba_lobs l, dba_segments s
WHERE s.segment_name = l.index_name
AND s.owner = l.owner
AND s.segment_type = ‘LOBINDEX’)
WHERE owner in UPPER(‘YOUR_USER/SCHEMA_NAME’)
GROUP BY table_name, owner
ORDER BY SUM(bytes) desc;
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