How to find Database size in Oracle

October 8, 2020

SCRIPTS

Below commands to find Database size in Oracle which includes Total DB size, Free size, used size of DB along with DB name & Hostname, etc.

SQL command which fetches database size in GB. Click here to get a sample output of the Oracle client version.

set lines 999
set pages 999
col HOST_NAME for a20

SELECT SYSDATE DATED, A.HOST_NAME, A.INSTANCE_NAME, A.VERSION,  C.TOTAL_ALLOCATED_GB, B.USED_GB, D.FREE_GB FROM V$INSTANCE A,
(SELECT SUM(BYTES)/1024/1024/1024 USED_GB FROM DBA_SEGMENTS) B,
(SELECT SUM(BYTES)/1024/1024/1024 TOTAL_ALLOCATED_GB FROM DBA_DATA_FILES) C,
(SELECT SUM(BYTES)/1024/1024/1024 FREE_GB FROM DBA_FREE_SPACE) D;

SQL command which fetch database size in MB. Click here to get a sample output of the Oracle client version.

set lines 999
set pages 999
col HOST_NAME for a20

SELECT SYSDATE DATED, A.HOST_NAME, A.INSTANCE_NAME, A.VERSION,  C.TOTAL_ALLOCATED_MB, B.USED_MB, D.FREE_MB FROM V$INSTANCE A,
(SELECT SUM(BYTES)/1024/1024 USED_MB FROM DBA_SEGMENTS) B,
(SELECT SUM(BYTES)/1024/1024 TOTAL_ALLOCATED_MB FROM DBA_DATA_FILES) C,
(SELECT SUM(BYTES)/1024/1024 FREE_MB FROM DBA_FREE_SPACE) D;

We always encourage the technical person to visit section SCRIPTS to get more daily usage SQL commands.

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