oracle 临时表空间

1.查看当前数据库默认的临时表空间

 SELECT * FROM DATABASE_PROPERTIES WHERE PROPERTY_NAME='DEFAULT_TEMP_TABLESPACE';

2.修改数据库默认的临时表空间

 alter database default temporary tablespace temp1;

3.查看临时表空间对应的文件

SELECT a.name temp_file_name, b.name, a.bytes
  FROM v$tempfile a, v$tablespace b
 WHERE a.ts# = b.ts#;

4.查看临时表空间的使用情况

  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,
         ROUND (
            (SUM (A.used_blocks * D.block_size) / 1024 / 1024) / D.mb_total,
            5)
         * 100
            "使用率 %"
    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;

5.查看session使用临时表空间的大小情况

SELECT S.sid || ',' || S.serial# sid_serial,
         S.username,
         S.osuser,
         P.spid,
         S.module,
         P.program,
         SUM (T.blocks) * TBS.block_size / 1024 / 1024 mb_used,
         T.tablespace,
         COUNT (*) statements
    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,
         P.program,
         TBS.block_size,
         T.tablespace
ORDER BY sid_serial;

6.看哪些sql在使用临时表空间

  SELECT a.username,
         a.sid,
         a.serial#,
         a.osuser,
         b.tablespace,
         b.blocks,
         c.sql_text
    FROM v$session a, v$tempseg_usage b, v$sqlarea c
   WHERE     a.saddr = b.session_addr
         AND c.address = a.sql_address
         AND c.hash_value = a.sql_hash_value
ORDER BY b.tablespace, b.blocks;