对临时表空间的一些常用查询

1.观察不同用户在不同临时表空间的分配情况
select temporary_tablespace,count(*) from dba_users group by temporary_tablespace;
2.切换指定用户和所有用户到指定临时表空间
alter user system temporary tablespace 表空间名字;
alter database temporary tablespace 表空间名字;

建立多个临时表空间分给不同的用户，其实是为了避免竞争，从而减缓IO竞争。
3.可以建立临时表空间组
create temporary tablespace temp1_1 tempfile '' size 100 tablespace group tmp_grp1;

在dba_tablespace_groups这个数据字典可以查看。

同时可以把临时表空间移动到临时表空间组里
alter tablespace temp_lib tablespace group tem_grp1;
4.收缩临时表空间
alter tablespace temp shrink space keep 8G;
alter tablespace temp shrink tempfile '';

监控临时表空间

查看临时表空间使用情况：

SELECT TU.TABLESPACE_NAME AS "TABLESPACE_NAME",
TT.TOTAL - TU.USED AS "FREE(G)",
TT.TOTAL AS "TOTAL(G)",
ROUND(NVL(TU.USED, 0) / TT.TOTAL * 100, 3) AS "USED(%)",
ROUND(NVL(TT.TOTAL - TU.USED, 0) * 100 / TT.TOTAL, 3) AS "FREE(%)"
FROM (SELECT TABLESPACE_NAME,
SUM(BYTES_USED) / 1024 / 1024 / 1024 USED
FROM GV_$TEMP_SPACE_HEADER
GROUP BY TABLESPACE_NAME) TU ,
(SELECT TABLESPACE_NAME,
SUM(BYTES) / 1024 / 1024 / 1024 AS TOTAL
FROM DBA_TEMP_FILES
GROUP BY TABLESPACE_NAME) TT
WHERE TU.TABLESPACE_NAME = TT.TABLESPACE_NAME;

COL TEMP_FILE FOR A60;
SELECT ROUND((F.BYTES_FREE + F.BYTES_USED)/1024/1024/1024, 2) AS "TOTAL(GB)",
ROUND(((F.BYTES_FREE + F.BYTES_USED) - NVL(P.BYTES_USED, 0))/1024/1024/1024,2) AS "FREE(GB)",
D.FILE_NAME AS "TEMP_FILE",
ROUND(NVL(P.BYTES_USED, 0)/1024/1024/1024, 2) AS "USED(GB)" ,
ROUND((F.BYTES_USED + F.BYTES_FREE)/1024/1024/1024, 2) AS "TOTAL(GB)",
ROUND(((F.BYTES_USED + F.BYTES_FREE) - NVL(P.BYTES_USED, 0))/1024/1024/1024, 2) AS "FREE(GB)" ,
ROUND(NVL(P.BYTES_USED, 0)/1024/1024/1024, 2) AS "USED(GB)"
FROM SYS.V_$TEMP_SPACE_HEADER F ,DBA_TEMP_FILES D ,SYS.V_$TEMP_EXTENT_POOL P
WHERE F.TABLESPACE_NAME(+) = D.TABLESPACE_NAME
AND F.FILE_ID(+) = D.FILE_ID
AND P.FILE_ID(+) = D.FILE_ID;
查看临时表空间对应的临时文件的使用情况

SELECT TABLESPACE_NAME AS TABLESPACE_NAME ,
BYTES_USED/1024/1024/1024 AS TABLESAPCE_USED ,
BYTES_FREE/1024/1024/1024 AS TABLESAPCE_FREE
FROM V$TEMP_SPACE_HEADER
ORDER BY 1 DESC;
查找消耗临时表空间资源比较多的SQL语句

SELECT se.username,
se.sid,
su.extents,
su.blocks * to_number(rtrim(p.value)) as Space,
tablespace,
segtype,
sql_text
FROM v$sort_usage su, v$parameter p, v$session se, v$sql s
WHERE p.name = 'db_block_size'
AND su.session_addr = se.saddr
AND s.hash_value = su.sqlhash
AND s.address = su.sqladdr
ORDER BY se.username, se.sid;

 （未完待续）