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April 5, 2006

Oracle10g:v$session_wait_history视图

作者:eygle

出处:http://blog.eygle.com

为了更有效的保留Session信息，Oracle10g新增加了一个v$session_wait_history视图
该视图用以记录活动Session的最近10次等待事件。

SQL> select event,p1text,p1,p2text,p2,p3text,p3,wait_time
  2  from v$session_wait_history where sid=120;

EVENT                         P1TEXT         P1 P2TEXT                 P2 P3TEXT   P3  WAIT_TIME
---------------------------- -------- -------- --------------- ---------- -------- -- ----------
db file sequential read      file#          14 block#               97456 blocks    1          0
row cache lock            cache id          11 mode                     0 request   3         49
row cache lock            cache id          11 mode                     0 request   3          0
db file sequential read      file#          10 block#              260171 blocks    1          1
db file sequential read      file#          14 block#              570536 blocks    1         10
db file sequential read      file#          14 block#                6363 blocks    1         12
db file sequential read      file#          14 block#               35285 blocks    1          9
db file sequential read      file#          14 block#               40674 blocks    1          9
db file sequential read      file#          14 block#               69631 blocks    1          1
db file sequential read      file#          14 block#               82498 blocks    1          3

10 rows selected

通过这个视图，Oracle将V$SESSION_WAIT延伸，从而可以获取更多的相关信息辅助数据库问题诊断。
这是Oracle10g中在ASH之外对于等待事件诊断的一个有益小改进。

 

Posted by eygle at 4:33 PM | Comments (0)

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