Size of schema

Get size of schema in GB.

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Warning: Review and test in a non-production environment before running.

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SELECT SUM(BYTES)/1024/1024/1024
  FROM DBA_SEGMENTS
 WHERE OWNER = 'APP_SCHEMA';
 
SELECT A.SEGMENT_NAME,A.BYTES/1024/1024/1024 GB
  FROM DBA_SEGMENTS A
 WHERE A.OWNER = 'APP_SCHEMA'
 ORDER BY 2 DESC;