Tablespace and datafile monitoring

To check Tablespace free space:

• SELECT TABLESPACE_NAME, SUM(BYTES/1024/1024) "Size (MB)"  FROM DBA_FREE_SPACE GROUP BY TABLESPACE_NAME;

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 UNION ALL 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 ORDER BY 4 DESC;

--or--

• 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 FROM DBA_HIST_TBSPC_SPACE_USAGE tsu, DBA_HIST_TABLESPACE_STAT ts, DBA_HIST_SNAPSHOT sp, DBA_TABLESPACES dt 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 union Select tablespace_name,sum(bytes) tots,0 from dba_data_files 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 where TABLESPACE_NAME = 'SDH_HRMS_DBF' group by OWNER, SEGMENT_NAME;

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   B.name, C.block_size, SUM (C.bytes) / 1024 / 1024 mb_total FROM   v$tablespace B, v$tempfile C WHERE    B.ts#= C.ts#  GROUP BY B.name, C.block_size ) D WHERE    A.tablespace_name = D.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_nameORDER BY S.sid;  

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, r.name 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 x.name  = '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 p.name  = '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(fn.name,1,DECODE(INSTR(fn.name,'/',2),0,INSTR(fn.name,':',1),INSTR(fn.name,'/',2))) mount_point,tn.name   tabsp_name,fn.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(fex.inc,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;