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Wednesday, 8 October 2014

Script: To Monitor Tablespaces/datafiles

Important Note: If any of the script in this blog is not running then please re-type it or try to retype quotation, command and braces (may be format is changed). I am using toad so if you are using SQL then try to fix column length before exectunig the script (if any).
To check Tablespace free space:
To check Tablespace by datafile:
SELECT tablespace_name, File_id, SUM(bytes/1024/1024)"Size (MB)" FROM DBA_FREE_SPACE
group by tablespace_name, file_id;
To Check Tablespace used and free space %:
SELECT /* + RULE */  df.tablespace_name "Tablespace",
df.bytes / (1024 * 1024) "Size (MB)", SUM(fs.bytes) / (1024 * 1024) "Free (MB)",
Nvl(Round(SUM(fs.bytes) * 100 / df.bytes),1) "% Free",
Round((df.bytes - SUM(fs.bytes)) * 100 / df.bytes) "% Used"
FROM dba_free_space fs,
(SELECT tablespace_name,SUM(bytes) bytes
FROM dba_data_files
GROUP BY tablespace_name) df
WHERE fs.tablespace_name (+)  = df.tablespace_name
GROUP BY df.tablespace_name,df.bytes
SELECT /* + RULE */ df.tablespace_name tspace,
fs.bytes / (1024 * 1024), SUM(df.bytes_free) / (1024 * 1024),
Nvl(Round((SUM(fs.bytes) - df.bytes_used) * 100 / fs.bytes), 1),
Round((SUM(fs.bytes) - df.bytes_free) * 100 / fs.bytes)
FROM dba_temp_files fs,
(SELECT tablespace_name,bytes_free,bytes_used
 FROM v$temp_space_header
GROUP BY tablespace_name,bytes_free,bytes_used) df
 WHERE fs.tablespace_name (+)  = df.tablespace_name
 GROUP BY df.tablespace_name,fs.bytes,df.bytes_free,df.bytes_used
Select t.tablespace, t.totalspace as " Totalspace(MB)", round((t.totalspace-fs.freespace),2) as "Used Space(MB)", fs.freespace as "Freespace(MB)", round(((t.totalspace-fs.freespace)/t.totalspace)*100,2) as "% Used", round((fs.freespace/t.totalspace)*100,2) as "% Free" from (select round(sum(d.bytes)/(1024*1024)) as totalspace, d.tablespace_name tablespace from dba_data_files d group by d.tablespace_name) t, (select round(sum(f.bytes)/(1024*1024)) as freespace, f.tablespace_name tablespace from dba_free_space f group by f.tablespace_name) fs where t.tablespace=fs.tablespace order by t.tablespace;
Tablespace (File wise) used and Free space
SELECT SUBSTR (df.NAME, 1, 40) file_name,dfs.tablespace_name, df.bytes / 1024 / 1024 allocated_mb, ((df.bytes / 1024 / 1024) -  NVL (SUM (dfs.bytes) / 1024 / 1024, 0)) used_mb,
NVL (SUM (dfs.bytes) / 1024 / 1024, 0) free_space_mb
FROM v$datafile df, dba_free_space dfs
WHERE df.file# = dfs.file_id(+)
GROUP BY dfs.file_id, df.NAME, df.file#, df.bytes,dfs.tablespace_name
ORDER BY file_name;
To check Growth rate of  Tablespace
Note: The script will not show the growth rate of the SYS, SYSAUX Tablespace. T
he script is used in Oracle version 10g onwards.
SELECT TO_CHAR (sp.begin_interval_time,'DD-MM-YYYY') days,
 ts.tsname , max(round((tsu.tablespace_size* dt.block_size )/(1024*1024),2) ) cur_size_MB,
 max(round((tsu.tablespace_usedsize* dt.block_size )/(1024*1024),2)) usedsize_MB
 WHERE tsu.tablespace_id= ts.ts# AND tsu.snap_id = sp.snap_id
 AND ts.tsname = dt.tablespace_name AND ts.tsname NOT IN ('SYSAUX','SYSTEM')
 GROUP BY TO_CHAR (sp.begin_interval_time,'DD-MM-YYYY'), ts.tsname
 ORDER BY ts.tsname, days;
List all Tablespaces with free space < 10% or full space> 90%
Select a.tablespace_name,sum(a.tots/1048576) Tot_Size,
sum(a.sumb/1024) Tot_Free, sum(a.sumb)*100/sum(a.tots) Pct_Free,
ceil((((sum(a.tots) * 15) - (sum(a.sumb)*100))/85 )/1048576) Min_Add
from (select tablespace_name,0 tots,sum(bytes) sumb
from dba_free_space a
group by tablespace_name
Select tablespace_name,sum(bytes) tots,0 from
group by tablespace_name) a
group by a.tablespace_name
having sum(a.sumb)*100/sum(a.tots) < 10
order by pct_free;
Script to find all object Occupied space for a Tablespace
Select OWNER, SEGMENT_NAME, SUM(BYTES)/1024/1024 "SZIE IN MB" from dba_segments
Which schema are taking how much space
Select obj.owner "Owner", obj_cnt "Objects", decode(seg_size, NULL, 0, seg_size) "size MB"
from (select owner, count(*) obj_cnt from dba_objects group by owner) obj,
 (select owner, ceil(sum(bytes)/1024/1024) seg_size  from dba_segments group by owner) seg
  where obj.owner  = seg.owner(+)
  order    by 3 desc ,2 desc, 1;
To Check Default Temporary Tablespace Name:
Select * from database_properties where PROPERTY_NAME like '%DEFAULT%';
To know default and Temporary Tablespace for particualr User:
Select username,temporary_tablespace,default_tablespace from dba_users where username='HRMS';
To know Default Tablespace for All User:
Select default_tablespace,temporary_tablespace,username from dba_users;
To Check Datafiles used and Free Space:
SELECT SUBSTR (df.NAME, 1, 40) file_name,dfs.tablespace_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 v$datafile df, dba_free_space dfs
WHERE df.file# = dfs.file_id(+)
GROUP BY dfs.file_id, df.NAME, df.file#, df.bytes,dfs.tablespace_name
ORDER BY file_name;
To check Used free space in Temporary Tablespace:
SELECT tablespace_name, SUM(bytes_used/1024/1024) USED, SUM(bytes_free/1024/1024) FREE
FROM   V$temp_space_header GROUP  BY tablespace_name;
SELECT   A.tablespace_name tablespace, D.mb_total,
         SUM (A.used_blocks * D.block_size) / 1024 / 1024 mb_used,
         D.mb_total - SUM (A.used_blocks * D.block_size) / 1024 / 1024 mb_free
FROM     v$sort_segment A,
         ( SELECT, C.block_size, SUM (C.bytes) / 1024 / 1024 mb_total
         FROM     v$tablespace B, v$tempfile C
         WHERE    B.ts#= C.ts#
         GROUP BY, C.block_size
         ) D
WHERE    A.tablespace_name =
GROUP by A.tablespace_name, D.mb_total;
Sort (Temp) space used by Session
SELECT   S.sid || ',' || S.serial# sid_serial, S.username, S.osuser, P.spid, S.module, S.program, SUM (T.blocks) * TBS.block_size / 1024 / 1024 mb_used,
T.tablespace, COUNT(*) sort_ops
FROM v$sort_usage T, v$session S, dba_tablespaces TBS, v$process P
WHERE T.session_addr = S.saddr
AND S.paddr = P.addr AND T.tablespace = TBS.tablespace_name
GROUP BY S.sid, S.serial#, S.username, S.osuser, P.spid, S.module, S.program, TBS.block_size, T.tablespace ORDER BY sid_serial;
Sort (Temp) Space Usage by Statement
SELECT S.sid || ',' || S.serial# sid_serial, S.username, T.blocks * TBS.block_size / 1024 / 1024 mb_used, T.tablespace,T.sqladdr address, Q.hash_value, Q.sql_text
FROM v$sort_usage T, v$session S, v$sqlarea Q, dba_tablespaces TBS
WHERE T.session_addr = S.saddr
AND T.sqladdr = Q.address (+) AND T.tablespace = TBS.tablespace_name
Who is using which UNDO or TEMP segment?
SELECT TO_CHAR(s.sid)||','||TO_CHAR(s.serial#) sid_serial,
NVL(s.username, 'None') orauser,s.program, undoseg,
t.used_ublk * TO_NUMBER(x.value)/1024||'K' "Undo"
FROM sys.v_$rollname r, sys.v_$session s, sys.v_$transaction t, sys.v_$parameter   x
WHERE s.taddr = t.addr AND r.usn   = t.xidusn(+) AND  = 'db_block_size';
Who is using the Temp Segment?
SELECT b.tablespace, ROUND(((b.blocks*p.value)/1024/1024),2)||'M' "SIZE",
a.sid||','||a.serial# SID_SERIAL, a.username, a.program
FROM sys.v_$session a,
sys.v_$sort_usage b, sys.v_$parameter p
WHERE  = 'db_block_size' AND a.saddr = b.session_addr
ORDER BY b.tablespace, b.blocks;
Total Size and Free Size of Database:
Select round(sum(used.bytes) / 1024 / 1024/1024 ) || ' GB' "Database Size",
round(free.p / 1024 / 1024/1024) || ' GB' "Free space"
from (select bytes from v$datafile
      union all
      select bytes from v$tempfile
      union all
      select bytes from v$log) used,  
(select sum(bytes) as p from dba_free_space) free
group by free.p;
To find used space of datafiles:
SELECT SUM(bytes)/1024/1024/1024 "GB" FROM dba_segments;
IO status of all of the datafiles in database:
WITH total_io AS
     (SELECT SUM (phyrds + phywrts) sum_io
        FROM v$filestat)
SELECT   NAME, phyrds, phywrts, ((phyrds + phywrts) / c.sum_io) * 100 PERCENT,
         phyblkrd, (phyblkrd / GREATEST (phyrds, 1)) ratio
    FROM SYS.v_$filestat a, SYS.v_$dbfile b, total_io c
   WHERE a.file# = b.file#
ORDER BY a.file#;
Displays Smallest size the datafiles can shrink to without a re-organize.
SELECT a.tablespace_name, a.file_name, a.bytes AS current_bytes, a.bytes - b.resize_to AS shrink_by_bytes, b.resize_to AS resize_to_bytes
FROM   dba_data_files a, (SELECT file_id, MAX((block_id+blocks-1)*&v_block_size) AS resize_to
        FROM   dba_extents
        GROUP by file_id) b
        WHERE  a.file_id = b.file_id
        ORDER BY a.tablespace_name, a.file_name;
Scripts to Find datafiles increment details:
Select  SUBSTR(,1,DECODE(INSTR(,'/',2),0,INSTR(,':',1),INSTR(,'/',2))) mount_point,   tabsp_name,   file_name,
ddf.bytes/1024/1024 cur_size, decode(fex.maxextend,
NULL,ddf.bytes/1024/1024,fex.maxextend*tn.blocksize/1024/1024) max_size,
nvl(fex.maxextend,0)*tn.blocksize/1024/1024 - decode(fex.maxextend,NULL,0,ddf.bytes/1024/1024)   unallocated,nvl(,0)*tn.blocksize/1024/1024  inc_by
from  sys.v_$dbfile fn,    sys.ts$  tn,    sys.filext$ fex,    sys.file$  ft,    dba_data_files ddf
where    fn.file# = ft.file# and  fn.file# = ddf.file_id
and    tn.ts# = ft.ts# and    fn.file# = fex.file#(+)
order by 1;


  1. Very Very Useful Scripts.
    Thank You Sir.

  2. hi sir, a small help, write a script that if the tablespace size which has more free space there the table want to be created??

  3. using ddl triggers

  4. Hi Sir, I have a prob,
    When a user logged into database and create a table, the table gets create into the respective tablespace assignd to that user or to the default tablespace System. In my task, i want that table to be created in the tablespace which has more free space. so for this i want a background script running for this, which has to recognise my create table query and drop that table into respective highest free space tablespace. Can you give me the idea how to solve this ??

  5. Dear,

    Sorry i can not give you the exact script. Try to make it as per the requirement.

  6. Hi Sahid,
    Nice an duseful.

    Hope this may also useful here.


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    Reference is as below.

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  8. I need script that to find statement space usage for all tablespaces

  9. It's really helped me to learn something new thanks fusion procurement training

  10. hi aravind ping me i ll help u i have the script