Oracle Spazio

ASM

Gestione ASM

Files e Tablespaces

Controllo Allocazione Spazio

Questa query controlla lo spazio allocato, e lo confronta con lo spazio di massima crescita dei datafiles. Utile per evidenziare casi in cui è necessario aggiungere altri datafiles.

--

set pagesize 200
set linesize 200

with 
 segs as (select tablespace_name,sum(bytes)/(1024*1024) mbs, count(*) nsegs from dba_segments group by tablespace_name),
 files as (select tablespace_name,count(file_name) nfiles,sum(case when maxbytes=0 then bytes else maxbytes end)/(1024*1024) max,sum(bytes)/(1024*1024) mba
             from dba_data_files group by tablespace_name)
select t.tablespace_name,
	t.block_size,
	f.nfiles,
        s.nsegs,
	round(f.max) max,
	round(s.mbs) mbs,
	round(f.max-s.mbs) sdiff,
	round(((f.max-s.mbs)/f.max)*100) pcts,
	round(f.mba) mba,
	round(f.mba-s.mbs) shrinkable,
	round(((f.mba-s.mbs)/f.mba)*100) pctsrnk
from dba_tablespaces t 
inner join files f on (t.tablespace_name=f.tablespace_name)
left outer join segs s on (t.tablespace_name=s.tablespace_name)
order by 10;

with
 tf as (select tablespace_name,count(*) nf,round(sum(bytes)/(1024*1024)) mba,round(sum(case when maxbytes=0 then bytes else maxbytes end)/(1024*1024)) max from dba_temp_files group by tablespace_name)
select	g.group_name,
	t.tablespace_name,
        f.nf nfiles,
	f.mba,
	f.max,
	round(s.allocated_space/(1024*1024)) mballoc,
	round(s.free_space/(1024*1024)) mbfree
   from tf f
 left outer join dba_tablespace_groups g on (g.tablespace_name=f.tablespace_name)
 left outer join dba_temp_free_space s on (s.tablespace_name=f.tablespace_name)
 right outer join dba_tablespaces t on (t.tablespace_name=f.tablespace_name)
 where t.contents='TEMPORARY'
 order by 1,2,3;

Per 10.2

with
 tf as (select tablespace_name,count(*) nf,round(sum(bytes)/(1024*1024)) mba,round(sum(case when maxbytes=0 then bytes else maxbytes end)/(1024*1024)) max from dba_temp_files group by tablespace_name),
 tsh as (select tablespace_name,round(sum(bytes_used)/(1024*1024)) used,round(sum(bytes_free)/(1024*1024)) free from v$temp_space_header group by tablespace_name)
select
        t.tablespace_name,
        f.nf nfiles,
        f.mba,
        f.max,
        tsh.used mballoc,
        tsh.free mbfree
   from tf f
 right outer join dba_tablespaces t on (t.tablespace_name=f.tablespace_name)
 right outer join tsh on (tsh.tablespace_name=f.tablespace_name)
 where t.contents='TEMPORARY'
 order by 1,2,3;

Sort Segments

SELECT tf.tablespace_name,
       ROUND(tf.total_space_mb) AS total_mb,
       ROUND(NVL(tu.used_space_mb, 0)) AS used_mb,
       ROUND(tf.total_space_mb - NVL(tu.used_space_mb, 0)) AS free_mb
FROM (SELECT tablespace_name, SUM(bytes)/(1024*1024) AS total_space_mb 
      FROM dba_temp_files GROUP BY tablespace_name) tf
LEFT JOIN (SELECT tablespace_name, SUM(used_blocks)*(SELECT value FROM v$parameter WHERE name='db_block_size')/(1024*1024) AS used_space_mb
           FROM v$sort_segment GROUP BY tablespace_name) tu
ON tf.tablespace_name = tu.tablespace_name;

Autoextend datafiles

Verificare se autoextend:

select TABLESPACE_NAME,FILE_ID,AUTOEXTENSIBLE,MAXBYTES/(1024*1024) MAX_MB,INCREMENT_BY from dba_data_files;

Autoextend datafiles:

begin
 for c1 in (select file_id from dba_data_files where autoextensible='NO')
 loop
   execute immediate 'alter database datafile ' || c1.file_id || ' autoextend on next 128M maxsize unlimited';
 end loop;
end;
/

Su un solo tablespace

begin
 for c1 in (select file_id from dba_data_files where tablespace_name='&1' and autoextensible='NO')
 loop
   execute immediate 'alter database datafile ' || c1.file_id || ' autoextend on next 128M maxsize unlimited';
 end loop;
end;
/

Mette in autoextend i files non in autoextend, ma con maxsize uguale alla grandezza reale

begin
 for c1 in (select file_id, bytes from dba_data_files where autoextensible='NO')
 loop
   execute immediate 'alter database datafile ' || c1.file_id || ' autoextend on next 128M maxsize ' || c1.bytes;
 end loop;
end;
/

Shrink datafiles

set linesize 1000 pagesize 0 feedback off trimspool on
with
 hwm as (
  -- get highest block id from each datafiles ( from x$ktfbue as we don't need all joins from dba_extents )
  select /*+ materialize */ ktfbuesegtsn ts#,ktfbuefno relative_fno,max(ktfbuebno+ktfbueblks-1) hwm_blocks
  from sys.x$ktfbue group by ktfbuefno,ktfbuesegtsn
 ),
 hwmts as (
  -- join ts# with tablespace_name
  select name tablespace_name,relative_fno,hwm_blocks
  from hwm join v$tablespace using(ts#)
 ),
 hwmdf as (
  -- join with datafiles, put 5M minimum for datafiles with no extents
  select file_name,nvl(hwm_blocks*(bytes/blocks),5*1024*1024)
hwm_bytes,bytes,autoextensible,maxbytes
  from hwmts right join dba_data_files using(tablespace_name,relative_fno)
 )
select
 case when autoextensible='YES' and maxbytes>=bytes
 then -- we generate resize statements only if autoextensible can grow back to current size
  '/* reclaim '||to_char(ceil((bytes-hwm_bytes)/1024/1024),999999)
   ||'M from '||to_char(ceil(bytes/1024/1024),999999)||'M */ '
   ||'alter database datafile '''||file_name||''' resize '||ceil(hwm_bytes/1024/1024)||'M;'
 else -- generate only a comment when autoextensible is off
  '/* reclaim '||to_char(ceil((bytes-hwm_bytes)/1024/1024),999999)
   ||'M from '||to_char(ceil(bytes/1024/1024),999999)
   ||'M after setting autoextensible maxsize higher than current size for file '
   || file_name||' */'
 end SQL
from hwmdf
where
 bytes-hwm_bytes>1024*1024 -- resize only if at least 1MB can be reclaimed
order by bytes-hwm_bytes desc
/

Autoextend tempfiles

Verificare se autoextend:

select TABLESPACE_NAME,FILE_ID,AUTOEXTENSIBLE,bytes/(1024*1024) MB,MAXBYTES/(1024*1024) MAX_MB,INCREMENT_BY from dba_temp_files;

select 'alter database tempfile ' || file_id || ' autoextend on next 128M;' from dba_temp_files where autoextensible='NO' and tablespace_name='TEMPNEW2';

begin
 for c1 in (select file_id from dba_temp_files)
 loop
   execute immediate 'alter database tempfile ' || c1.file_id || ' autoextend on next 128M maxsize unlimited';
 end loop;
end;
/

Preservando maxsize:

begin
 for c1 in (select file_id,bytes from dba_temp_files)
 loop
   execute immediate 'alter database tempfile ' || c1.file_id || ' autoextend on next 128M maxsize ' || c1.bytes;
 end loop;
end;
/

shrink tempfiles

select 'alter database tempfile ' || file_id || ' resize 8M;' from dba_temp_files where AUTOEXTENSIBLE='YES' and maxbytes >= bytes;

begin
 for c1 in (select FILE_ID from dba_temp_files where AUTOEXTENSIBLE='YES' and maxbytes >= bytes)
  loop
   begin
    execute immediate 'alter database tempfile ' || c1.file_id || ' resize 8M';
      exception
       when others then
         null;
   end;
  end loop;
 end;
/

shrink temporary tablespace

select 'alter tablespace ' || tablespace_name || ' shrink space;' from dba_tablespaces where contents='TEMPORARY';

aggiunta datafiles e tempfiles

aggiunge datafiles dal 5 al 10 (in caso che non abbiamo db_create_file_dest valorizzato)

begin
   for c1 in 5..10
   loop
    execute immediate 'alter tablespace TBSDATA add datafile ''/u01/app/oracle/oradata/ORCL/tbsdata_0' || c1 || '.dbf'' size 8M autoextend on next 128M maxsize unlimited';
   end loop;
end;
/

Recyclebin

Schedula pulizia recycle bin

Cancella dal recyclebin tutti gli oggetti cancellati da almeno 3 giorni

BEGIN
  DBMS_SCHEDULER.create_job (
    job_name        => 'purge_recyclebin_3days',
    job_type        => 'PLSQL_BLOCK',
    job_action      => '
begin
  for c1 in (select owner,type,OBJECT_NAME from dba_recyclebin where to_date(DROPTIME,''YYYY-MM-DD:HH24:MI:SS'') < sysdate-3 and CAN_PURGE=''YES'')
   loop
     begin
       execute immediate ''purge '' || c1.type || '' '' || c1.owner || ''."'' || c1.object_name || ''"'';
       exception
        when others then
          null;
     end;
   end loop;
end;
',
    start_date      => SYSTIMESTAMP,
    repeat_interval => 'freq=daily; byhour=0; byminute=0; bysecond=0;',
    enabled         => TRUE);
END;
/

Segmenti

Tablespace map

col owner for a20
select owner,segment_type,sum(bytes)/(1024*1024) mb from dba_segments where tablespace_name='&1' group by owner,segment_type order by 1,2;

col owner for a20
select tablespace_name,owner,segment_type,sum(bytes)/(1024*1024) mb from dba_segments group by tablespace_name,owner,segment_type order by 1,2,3;

Segment Advisor

--
set pagesize 200
set linesize 200
set autotrace off
-- select tablespace_name, segment_name, segment_type, partition_name,
-- recommendations, c1 from
-- table(dbms_space.asa_recommendations('FALSE', 'FALSE', 'FALSE'));
spool segadv.txt
select '/*' || recommendations || ' */ ' || c1 || ';' from
 table(dbms_space.asa_recommendations('FALSE', 'FALSE', 'FALSE')) where c1 is not null order by segment_type,reclaimable_space;
spool off

Per eseguire lo shrink delle tabelle:

--
set verify off echo off
alter table &1 enable row movement;
-- non mette lock esclusivo ma non libera lo spazio
alter table &1 shrink space compact;
-- libera lo spazio ma mette lock esclusivo per liberare spazio alla fine
alter table &1 shrink space;         
alter table &1 disable row movement;