find database size in Oracle SQL developer

In phpmyadmin, it's able to see database disk usage. I was wondering if there'开发者_运维问答s such thing in Oracle SQL developer. Thanks!

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select nvl(b.tablespace_name,
         nvl(a.tablespace_name,'UNKNOWN'))
         tablespace_name,
       kbytes_alloc kbytes,
       kbytes_alloc-nvl(kbytes_free,0) 
         size_alloc_bytes,
       round(((kbytes_alloc-nvl(kbytes_free,0))/
         kbytes_alloc)*200) used_chart,
       to_char(((kbytes_alloc-nvl(kbytes_free,0))/
         kbytes_alloc)*100,
         '999G999G999G999G999G999G990D00') ||'%' used,
       data_files
  from ( select sum(bytes)/1024/1024 Kbytes_free,
              max(bytes)/1024/1024 largest,
              tablespace_name
       from  sys.dba_free_space
       group by tablespace_name ) a,
     ( select sum(bytes)/1024/1024 Kbytes_alloc,
              tablespace_name, count(*) data_files
       from sys.dba_data_files
       group by tablespace_name )b
 where a.tablespace_name (+) = b.tablespace_name

Source

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I'd recommend the Insider extension for SQL Developer (Raptor).

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select sum(bytes) Bytes,
round(sum(bytes)/power(1000,1)) KiloBytes,
round(sum(bytes)/power(1000,2)) MegaBytes,
round(sum(bytes)/power(1000,3)) GigaBytes,
round(sum(bytes)/power(1000,4)) TeraBytes,
round(sum(bytes)/power(1000,5)) PetaBytes,
round(sum(bytes)/power(1000,6)) ExaBytes,
round(sum(bytes)/power(1000,7)) ZettaBytes,
round(sum(bytes)/power(1000,8)) YottaBytes
from dba_data_files;

Ensure that you are logged in with sysdba privileges to run this script.

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If DB is monitored in Grid Control, then, in emrep database execute this query (History of DB size):

SELECT DECODE(m.metric_column, 'ALLOCATED_GB', 'ALLOCATED_GB', 'USED_GB', 'USED_GB') AS bb,
  m.rollup_timestamp AS rollup_timestamp,
  SUM(m.average) AS value
FROM mgmt$metric_daily m,
  mgmt$target_type t
WHERE t.target_guid=
  (SELECT target_guid FROM mgmt$target WHERE target_name='ORCL' /* Your DB name /
  )
AND (t.target_type ='rac_database'
OR (t.target_type ='oracle_database'
AND t.TYPE_QUALIFIER3 != 'RACINST'))
AND m.target_guid =t.target_guid
AND m.metric_guid =t.metric_guid
AND t.metric_name ='DATABASE_SIZE'
AND (t.metric_column ='ALLOCATED_GB'
OR t.metric_column ='USED_GB')
AND m.rollup_timestamp >= '01.01.2010' / Start date */
AND m.rollup_timestamp <= SYSDATE
AND DECODE(m.metric_column, 'ALLOCATED_GB', 'ALLOCATED_GB', 'USED_GB', 'USED_GB')='USED_GB'
GROUP BY DECODE(m.metric_column,'ALLOCATED_GB','ALLOCATED_GB','USED_GB','USED_GB'),
  m.rollup_timestamp
ORDER BY 2;

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An oracle database consists of data files, redo log files, control files, temporary files.

The size of the database actually means the total size of all these files.

select 
( select sum(bytes)/1024/1024/1024 data_size from dba_data_files ) +
( select nvl(sum(bytes),0)/1024/1024/1024 temp_size from dba_temp_files ) +
( select sum(bytes)/1024/1024/1024 redo_size from sys.v_$log ) +
( select sum(BLOCK_SIZE*FILE_SIZE_BLKS)/1024/1024/1024 controlfile_size from v$controlfile) "Size in GB"
from
dual

Source: http://nimishgarg.blogspot.com/2010/05/oracle-total-size-of-database.html