查看drop会话的等待事件

以下总结了关于 Oracle 数据库临时表空间的相关 SQL 语句：

Oracle 临时表空间创建和添加数据文件：

--创建临时表空间 tempdata
create temporary tablespace tempdata tempfile '/oradata/orcl/tempdata01.dbf' size 30g autoextend off;
--新增临时表空间数据文件
alter tablespace tempdata add tempfile '/oradata/orcl/tempdata02.dbf' size 30g autoextend off;
--删除临时表空间数据文件
alter tablespace tempdata drop tempfile '/oradata/orcl/tempdata02.dbf' including datafiles;
--调整临时表空间数据文件大小
alter database tempfile '/oradata/orcl/tempdata01.dbf' resize 2G;
--设置自动扩展
alter database tempfile '/oradata/orcl/tempdata01.dbf' autoextend on;
--切换默认临时表空间
alter database default temporary tablespace tempdata;
--删除临时表空间
drop tablespace temp including contents and datafiles cascade constraints;
--收缩临时表空间
alter tablespace temp shrink space keep 8G;
alter tablespace temp shrink tempfile '/oradata/orcl/tempdata01.dbf';

查看当前默认临时表空间：

SELECT PROPERTY_NAME, PROPERTY_VALUE FROM DATABASE_PROPERTIES WHERE PROPERTY_NAME='DEFAULT_TEMP_TABLESPACE';

查询temp表空间使用率：

select  df.tablespace_name "Tablespace",
       df.totalspace "Total(MB)",
       nvl(FS.UsedSpace, 0)  "Used(MB)",
       (df.totalspace - nvl(FS.UsedSpace, 0)) "Free(MB)",
       round(100 * (1-( nvl(fs.UsedSpace, 0) / df.totalspace)), 2) "Pct. Free(%)"
FROM  (SELECT tablespace_name, round(SUM(bytes) / 1048576) TotalSpace
        FROM   dba_TEMP_files
        GROUP  BY tablespace_name) df,
       (SELECT tablespace_name, ROUND(SUM(bytes_used) / 1024 / 1024)  UsedSpace
        FROM   gV$temp_extent_pool
        GROUP  BY tablespace_name) fs  WHERE  df.tablespace_name = fs.tablespace_name(+)

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;

查询实时使用temp表空间的sql_id和sid：

set linesize 260 pagesize 1000
col machine for a40
col program for a40
SELECT se.username,
       sid,
       serial#,
       se.sql_id
       machine,
       program,
       tablespace,
       segtype,
       (su.BLOCKS*8/1024/1024) GB
  FROM v$session se, v$sort_usage su
 WHERE se.saddr = su.session_addr
 order by su.BLOCKS desc;

/*需要注意的是这里查询sql_id要用v$session视图的sql_id，而不要用v$sort_usage视图的sql_id，v$sort_usage视图里面的sql_id是不准确的*/

查询历史的temp表空间的使用的SQL_ID：

select a.SQL_ID,
       a.SAMPLE_TIME,
       a.program,
       sum(trunc(a.TEMP_SPACE_ALLOCATED / 1024 / 1024)) MB
  from v$active_session_history a
 where TEMP_SPACE_ALLOCATED is not null 
 and sample_time between
 to_date('&date1', 'yyyy-mm-dd hh24:mi:ss') and
 to_date('&date2', 'yyyy-mm-dd hh24:mi:ss')
 group by a.sql_id,a.SAMPLE_TIME,a.PROGRAM
 order by 2 asc,4 desc;