Using this query you can find database name, server name and database total size in mega byte ....
SQL> SET LINE 2000;
SQL>
SQL> SELECT D.NAME, I.HOST_NAME, ROUND (SUM (F.BYTES) / 1048576) MB
2 FROM V$DATABASE D
3 CROSS JOIN V$INSTANCE I
4 CROSS JOIN V$DATAFILE F
5 GROUP BY D.NAME, I.HOST_NAME;
NAME HOST_NAME MB
--------- ---------------------------------------------------------------- ----------
ORCL N1020 39685
SQL>
SQL> SET LINE 2000;
SQL>
SQL> SELECT D.NAME, I.HOST_NAME, ROUND (SUM (F.BYTES) / 1048576) MB
2 FROM V$DATABASE D
3 CROSS JOIN V$INSTANCE I
4 CROSS JOIN V$DATAFILE F
5 GROUP BY D.NAME, I.HOST_NAME;
NAME HOST_NAME MB
--------- ---------------------------------------------------------------- ----------
ORCL N1020 39685
SQL>
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