【翻译自mos文章】v$undostat视图没有依照每10分钟进行更新，v$undostat仅仅有1行（one rows）

v$undostat视图没有依照每10分钟进行更新，v$undostat仅仅有1行（one rows）

參考原文：

The V$UNDOSTAT view is not getting updated in every 10 minutes. (Doc ID 1206365.1)

适用于：

Oracle Server - Enterprise Edition - Version: 10.2.0.1 and later   [Release: 10.2 and later ]

Information in this document applies to any platform.

症状：

The V$UNDOSTAT view is not getting updated every 10 minutes.

SQL> select BEGIN_TIME,END_TIME, UNDOBLKS from v$undostat;

BEGIN_TIME END_TIME UNDOBLKS

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

21-aug-2010 03:48:44 07-sep-2010 11:02:14 75016989

以上查询仅仅返回1行。

变化：

SQL> sho parameter undo

NAME TYPE VALUE

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

_in_memory_undo boolean FALSE

_undo_autotune boolean FALSE     --->注意此行记录。

undo_management string AUTO

undo_retention integer 3600

undo_tablespace string UNDOTBS1

The parameter "_undo_autotune" has been set to FALSE.

This has disabled automatic undo tuning.

解决方式：

设置"_undo_autotune" parameter to TRUE:

SQL> alter system set "_undo_autotune"=true;

This disables the standard tracking of UNDO statistics in V$UNDOSTAT.  You can see only the one row of data as noted in this case.