oracle 臨時表空間的恢復

1    先查看 臨時表空間文件有哪一個？

    v$tempfile.name

SQL> select file#,name from v$tempfile;

     FILE# NAME
---------- --------------------------------------------------
	 1 /u01/oracle/oradata/orcl/temp01.dbf

2    查看當前臨時表空間是哪一個？

SQL> select distinct TEMPORARY_TABLESPACE from dba_users;

TEMPORARY_TABLESPACE
------------------------------
TEMP

3    查看臨時表空間和對於的文件名字？

SQL> select TABLESPACE_NAME,FILE_NAME from dba_temp_files;

TABLESPACE_NAME      FILE_NAME
-------------------- --------------------------------------------------
TEMP		     /u01/oracle/oradata/orcl/temp01.dbf

若是臨時表空間文件丟失，怎麼辦？

SQL> ho rm -rf /u01/oracle/oradata/orcl/temp01.dbf

刪除臨時表空間，可是仍是能夠進行排序的。

SQL> alter system flush SHARED_POOL;

System altered.

SQL> alter system flush BUFFER_CACHE;

System altered.

SQL> alter system flush SHARED_POOL;

System altered.

SQL> alter system flush BUFFER_CACHE;

System altered.

這個時候若是排序數據再大一點就異常了

SQL> select * from tmp_20170409 order by 1,2,3,4,5,6,7,8;
select * from tmp_20170409 order by 1,2,3,4,5,6,7,8
              *
ERROR at line 1:
ORA-01116: error in opening database file 201
ORA-01110: data file 201: '/u01/oracle/oradata/orcl/temp01.dbf'
ORA-27041: unable to open file
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3

解決辦法：建立另外一個臨時文件，切換一下臨時表空間

4    建立一個好的臨時表空間進行替換

    4.1 將原來的臨時表空間改個名字

        alter tablespace temp rename to tempold.dbf;

SQL> alter tablespace temp rename to tempold;

Tablespace altered.

    4.2 新建一個新的表空間temp

SQL> create temporary tablespace temp tempfile '/u01/oracle/oradata/orcl/temp1.dbf' size 10M autoextend on;

Tablespace created.

    原來的臨時表空間temp 已經改tempold ，並且已經建立了一個新的臨時表空間temp,下面只需把新建的temp 表空間設置爲默認臨時表空間

    4.3 設置默認臨時表空間

SQL> alter database default temporary tablespace temp;

Database altered.

    默認表空間已經修復

SQL> select * from tmp_20170409 where rownum < 10 order by 1,2,3,4,5,6,7,8;

USERNAME			  USER_ID PASSWORD
------------------------------ ---------- ------------------------------
ACCOUNT_STATUS			 LOCK_DATE EXPIRY_DA
-------------------------------- --------- ---------
DEFAULT_TABLESPACE	       TEMPORARY_TABLESPACE	      CREATED
------------------------------ ------------------------------ ---------
PROFILE 		       INITIAL_RSRC_CONSUMER_GROUP
#能夠正常排序

    4.4 刪除原來的已經被更名爲tempold的臨時表空間

SQL> select * from tmp_20170409 where rownum < 10 order by 1,2,3,4,5,6,7,8;

USERNAME			  USER_ID PASSWORD
------------------------------ ---------- ------------------------------
ACCOUNT_STATUS			 LOCK_DATE EXPIRY_DA
-------------------------------- --------- ---------
DEFAULT_TABLESPACE	       TEMPORARY_TABLESPACE	      CREATED
------------------------------ ------------------------------ ---------
PROFILE 		       INITIAL_RSRC_CONSUMER_GROUP

被改爲tempold 對於的表空間文件已經刪除了，因此這裏只須要把這個表空間刪除就行了

SQL> drop tablespace tempold;

Tablespace dropped.