oracle切換undo表空間

時間 2019-12-05

標籤 oracle 切換 undo 空間欄目 Oracle 简体版

原文原文鏈接

Oracle裏的回滾表空間在數據庫使用一段時間後，undo表空間的dbf文件每每會增加到比較大，這個時候咱們須要切換undo表空間數據庫

1.新建undo表空間spa

SQL> create undo tablespace undotbs2 datafile '/data/undotbs02.dbf' size 10M autoextend on next 10M ;get

2.因爲undo_tablespace是個動態參數，因此任什麼時候候均可以set。string

SQL> alter system set undo_tablespace='undotbs2' scope=both; io

系統已更改。 table

3.查看原來的undo表空間中的undo segment是否都爲offlinefile

SQL> select tablespace_name,segment_name,status from dba_rollback_segs; select

TABLESPACE_NAME SEGMENT_NAME STATUS next

------------------------------ ------------------------------ ---------------- 數據

SYSTEM SYSTEM ONLINE

UNDOTBS1 _SYSSMU1$ OFFLINE

UNDOTBS1 _SYSSMU2$ OFFLINE

UNDOTBS1 _SYSSMU3$ OFFLINE

UNDOTBS1 _SYSSMU4$ OFFLINE

UNDOTBS1 _SYSSMU5$ OFFLINE

UNDOTBS1 _SYSSMU6$ OFFLINE

UNDOTBS1 _SYSSMU7$ OFFLINE

UNDOTBS1 _SYSSMU8$ OFFLINE

UNDOTBS1 _SYSSMU9$ OFFLINE

UNDOTBS1 _SYSSMU10$ OFFLINE

UNDOTBS2 _SYSSMU11$ ONLINE

UNDOTBS2 _SYSSMU12$ ONLINE

UNDOTBS2 _SYSSMU13$ ONLINE

UNDOTBS2 _SYSSMU14$ ONLINE

UNDOTBS2 _SYSSMU15$ ONLINE

UNDOTBS2 _SYSSMU16$ ONLINE

UNDOTBS2 _SYSSMU17$ ONLINE

UNDOTBS2 _SYSSMU18$ ONLINE

UNDOTBS2 _SYSSMU19$ ONLINE

TABLESPACE_NAME SEGMENT_NAME STATUS

------------------------------ ------------------------------ ----------------

UNDOTBS2 _SYSSMU20$ ONLINE

21 rows selected www.2cto.com

原來undotbs1的undo_segment 都爲offline，則能夠刪除undotbs1.

SQL> alter tablespace undotbs1 offline;

SQL> drop tablespace undotbs1 including contents and datafiles;

表空間已刪除。

再次查看：

SQL> select tablespace_name,segment_name,status from dba_rollback_segs;

TABLESPACE_NAME SEGMENT_NAME STATUS

------------------------------ ------------------------------ ----------------

SYSTEM SYSTEM ONLINE

UNDOTBS2 _SYSSMU11$ ONLINE

UNDOTBS2 _SYSSMU12$ ONLINE

UNDOTBS2 _SYSSMU13$ ONLINE

UNDOTBS2 _SYSSMU14$ ONLINE

UNDOTBS2 _SYSSMU15$ ONLINE

UNDOTBS2 _SYSSMU16$ ONLINE

UNDOTBS2 _SYSSMU17$ ONLINE

UNDOTBS2 _SYSSMU18$ ONLINE

UNDOTBS2 _SYSSMU19$ ONLINE

UNDOTBS2 _SYSSMU20$ ONLINE

11 rows selected www.2cto.com

SQL> show parameter undo

NAME TYPE VALUE

------------------------------------ ----------- ------------------------------

undo_management string AUTO

undo_retention integer 900

undo_tablespace string undotbs1

--EOF

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