Oracle臨時表空間主要用來做查詢和存放一些緩沖區數據。臨時表空間消耗的主要原因是需要對查詢的中間結果進行排序。
重啟數據庫可以釋放臨時表空間,如果不能重啟實例,而一直保持問題sql語句的執行,temp表空間會一直增長。直到耗盡硬盤空間。
網上有人猜測在磁盤空間的分配上,oracle使用的是貪心算法,如果上次磁盤空間消耗達到1GB,那么臨時表空間就是1GB。也就是說當前臨時表空間文件的大小是歷史上使用臨時表空間最大的大小。
臨時表空間的主要作用:
索引create或rebuild
Order by 或 group by
Distinct 操作
Union 或 intersect 或 minus
Sort-merge joins
analyze
查看臨時表空間大小查看臨時表文件大小和已使用空間
select
t1."Tablespace" "Tablespace",
t1."Total (G)" "Total (G)",
nvl(t2."Used (G)", 0) "Used(G)",
t1."Total (G)" - nvl(t2."Used (G)", 0) "Free (G)"
from
(
select
tablespace_name "Tablespace", to_char((
sum
(bytes/1024/1024/1024)),'99,999,990.900') "Total (G)"
from
dba_temp_files
group
by
tablespace_name
union
select
tablespace_name "Tablespace", to_char((
sum
(bytes/1024/1024/1024)),'99,999,990.900') "Total (G)"
from
dba_data_files
where
tablespace_name
like
'TEMP%'
group
by
tablespace_name
) t1,
(
select
tablespace
, round(
sum
(blocks)*8/1024) "Used (G)"
from
v$sort_usage
group
by
tablespace
) t2
where
t1."Tablespace"=t2.
tablespace
(+)
查看當前臨死表使用空間大小與正在占用臨時表空間的sql語句
select
sess.SID, segtype, blocks*8/1000 "MB" ,sql_text
from
v$sort_usage
sort
, v$session sess,v$sql
sql
where
sort
.SESSION_ADDR = sess.SADDR
and
sql
.ADDRESS = sess.SQL_ADDRESS
order
by
blocks
desc
;
select
'the ' ||
name
|| ' temp tablespaces ' || tablespace_name ||
?????? ' idle ' ||
?????? round(100 - (s.tot_used_blocks / s.total_blocks) * 100, 3) ||
?????? '% at ' || to_char(
sysdate
, 'yyyymmddhh24miss')
from
(
select
d.tablespace_name tablespace_name,
?????????????? nvl(
sum
(used_blocks), 0) tot_used_blocks,
??????????????
sum
(blocks) total_blocks
?????????
from
v$sort_segment v, dba_temp_files d
????????
where
d.tablespace_name = v.tablespace_name(+)
????????
group
by
d.tablespace_name) s,
?????? v$database;
select
'ALTER database TEMPFILE ' || file_name || ' resize 100M ;'
from
dba_temp_files
where
tablespace_name = 'ONLYDWTEMP';
ALTER database TEMPFILE '/oradata/ONLYDWTEMP06.dbf' resize 100M ;
ALTER database TEMPFILE '/oradata/ONLYDWTEMP07.dbf' resize 100M ;
ALTER database TEMPFILE '/oradata/ONLYDWTEMP08.dbf' resize 100M ;
ALTER database TEMPFILE '/oradata/ONLYDWTEMP09.dbf' resize 100M ;
ALTER database TEMPFILE '/oradata/ONLYDWTEMP10.dbf' resize 100M ;
ALTER database TEMPFILE '/oradata/ONLYDWTEMP01.dbf' resize 100M ;
ALTER database TEMPFILE '/oradata/ONLYDWTEMP02.dbf' resize 100M ;
ALTER database TEMPFILE '/oradata/ONLYDWTEMP03.dbf' resize 100M ;
ALTER database TEMPFILE '/oradata/ONLYDWTEMP04.dbf' resize 100M ;
ALTER database TEMPFILE '/oradata/ONLYDWTEMP05.dbf' resize 100M ;
SQL> ALTER database TEMPFILE '/oradata/ONLYDWTEMP09.dbf' resize 100M ;
ALTER database TEMPFILE '/oradata/ONLYDWTEMP09.dbf' resize 100M
ORA-03297: file contains used data beyond requested RESIZE value
創建新的臨時表空間SQL> create temporary tablespace TEMP1 TEMPFILE '/oradata/TEMP1_01.dbf' size 100M;
Tablespace created
SQL> create temporary tablespace TEMP2 TEMPFILE '/oradata/TEMP2_01.dbf' size 100M;
Tablespace created
將當前臨時表空間指定為新的臨時表空間SQL> alter database default temporary tablespace TEMP1;
Database altered
刪除舊的臨時表空間SQL> drop tablespace ONLYDWTEMP including contents and datafiles;
Tablespace dropped
http://blog.csdn.net/47522341/archive/2009/02/05/3864171.aspx
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