CALCULATING THE FREE SPACE IN A DATAFILE AND TABLESPACES

select substr(A.tablespace_name,1,16) "Tablespace",
MAX(A.contents) "Type",
MAX(A.status) "Status",
MAX(A.initial_extent)/1024 "Initial extent(Kb)",
MAX(A.next_extent)/1024 "Next extent(Kb)",
MAX(A.max_extents) "Max extents",
MAX(A.pct_increase) "Pct_increase",
(SUM(B.BYTES)*COUNT(DISTINCT B.FILE_ID)/COUNT(B.FILE_ID)/

1024/1024)-(ROUND(SUM(C.BYTES)/1024/1024/COUNT(DISTINCT B.FILE_ID))) "USED SIZE(Mb)",
(SUM(B.BLOCKS)*COUNT(DISTINCT B.FILE_ID)/COUNT(B.FILE_ID))-(SUM(C.BLOCKS)/COUNT(DISTINCT B.FILE_ID)) "USED BLOCKS",
TO_CHAR(100-(SUM(C.BLOCKS)*100*COUNT(B.FILE_ID)/(SUM(B.BLOCKS)*COUNT(DISTINCT B.FILE_ID)))/COUNT(DISTINCT B.FILE_ID),'999.99')||'%' "USED USAGE",
ROUND(SUM(C.BYTES)/1024/1024/COUNT(DISTINCT B.FILE_ID)) "FREE SIZE(MB)",
SUM(C.BLOCKS)/COUNT(DISTINCT B.FILE_ID) "FREE BLOCKS",
TO_CHAR((SUM(C.BLOCKS)*100*COUNT(B.FILE_ID)/(SUM(B.BLOCKS)*COUNT(DISTINCT B.FILE_ID)))/COUNT(DISTINCT B.FILE_ID),'999.99')||'%' "FREE USAGE",
SUM(B.BYTES)*COUNT(DISTINCT B.FILE_ID)/COUNT(B.FILE_ID)/1024/1024 "TOTAL SIZE(Mb)",
SUM(B.BLOCKS)*COUNT(DISTINCT B.FILE_ID)/COUNT(B.FILE_ID) "TOTAL BLOCKS"
from dba_tablespaces A,
DBA_DATA_FILES B,
DBA_FREE_SPACE C
WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME
AND A.TABLESPACE_NAME=C.TABLESPACE_NAME
GROUP BY A.TABLESPACE_NAME
order by 1;

 

 

SELECT SUBSTR (df.file_name, 1, 60) file_name, df.bytes / 1024 / 1024 allocated_mb,
((df.bytes / 1024 / 1024) - NVL (SUM (dfs.bytes) / 1024 / 1024, 0))
used_mb,
NVL (SUM (dfs.bytes) / 1024 / 1024, 0) free_space_mb
FROM dba_data_files df, dba_free_space dfs
WHERE df.FILE_ID = dfs.file_id(+)
GROUP BY dfs.file_id, df.file_NAME, df.file_id, df.bytes
UNION ALL
select file_name, bytes/1024/1024 "allocated_mb",user_bytes/1024/1024 "used_mb", ((bytes/1024/1024) - (user_bytes/1024/1024)) "free_space_mb" from dba_temp_files;

 

 

 

select distinct
a.tablespace_name,
SUM(a.bytes)/1024/1024 "Used Size MB",
SUM(decode(b.maxextend, null, A.BYTES/1024/1024, b.maxextend*8192/1024/1024)) "Max Size Mb",
(SUM(a.bytes)/1024/1024 - round(c."Free"/1024/1024)) "Total Used MB",
(SUM(decode(b.maxextend, null, A.BYTES/1024/1024, b.maxextend*8192/1024/1024)) - (SUM(a.bytes)/1024/1024 - round(c."Free"/1024/1024))) "Total Free MB",
round(100*(SUM(a.bytes)/1024/

1024 - round(c."Free"/1024/1024))/(SUM(decode(b.maxextend, null, A.BYTES/1024/1024, b.maxextend*8192/1024/1024)))) "Used Percentage"
from
dba_data_files a,
sys.filext$ b,
(SELECT d.tablespace_name , sum(nvl(c.bytes,0)) "Free" FROM dba_tablespaces d,DBA_FREE_SPACE c where d.tablespace_name = c.tablespace_name(+) group by d.tablespace_name) c
where a.file_id = b.file#(+)
and a.tablespace_name = c.tablespace_name
GROUP by a.tablespace_name, c."Free"/1024
order by round(100*(SUM(a.bytes)/1024/1024 - round(c."Free"/1024/1024))/(SUM(decode(b.maxextend, null, A.BYTES/1024/1024, b.maxextend*8192/1024/1024)))) desc;