1SELECT sum(BYTES) / 1e6 AS SIZE_MB FROM DBA_SEGMENTS WHERE OWNER = 'schema_name';
2-- By type
3SELECT SEGMENT_TYPE, sum(BYTES) / 1e6 AS SIZE_MB FROM DBA_SEGMENTS
4 WHERE OWNER = 'schema_name' GROUP BY SEGMENT_TYPE;
5-- By schema
6SELECT OWNER, sum(BYTES) / 1e6 AS SIZE_MB FROM DBA_SEGMENTS GROUP BY OWNER
7 ORDER BY SIZE_MB DESC;
1-- Oracle: Size of a table in a tablespace
2SELECT
3 e.owner,
4 e.segment_name,
5 e.tablespace_name,
6 SUM(e.bytes) / 1048576 megs
7FROM dba_extents e
8WHERE
9 e.owner = 'xxMY_OWNERxx'
10 AND e.tablespace_name = 'xxMY_TBSxx'
11 AND e.segment_name = 'xxMY_TABLExx'
12GROUP BY e.owner, e.segment_name, e.tablespace_name
13ORDER BY
14 e.tablespace_name,
15 e.segment_name;