I think that in order to get correct statistics, you should take time difference
before and after you made modification. The same logic as you collect UTLBSTAT
and UTLESTAT report  for database performance analysis.  Let me know if I am
wrong.

Eveleen



Please respond to [EMAIL PROTECTED]


"Mitchell" <[EMAIL PROTECTED]> on 02/06/2001 03:11:50 PM

                                                                                
  Message - From: "Mitchell" <[EMAIL PROTECTED]> on 02/06/2001 09:11 PM GMT    
                                                                                



                                                              
                                                              
                                                              
 To:      Multiple recipients of list ORACLE-L                
          <[EMAIL PROTECTED]>                              
                                                              
 cc:      (bcc: Eveleen Xu/NNIB/NNNG)                         
                                                              
                                                              
                                                              
 Subject: v$waitstat                                          
                                                              






Hi DBAs

I have follwoing v$waitstat output show contention on undo header.
When I add some rollback segments. the count and time is up. How can reset
the count? or I do something wrong.

Mitchell


Tue Feb 06
page    1
                                                                Disk
Balancing Report

CLASS                   COUNT       TIME
------------------ ---------- ----------
data block            7246880    6502280
sort block                  0          0
save undo block             0          0
segment header            736       4273
save undo header            0          0
free list                   0          0
extent map                  9          7
bitmap block                0          0
bitmap index block          0          0
unused                      0          0
system undo header          0          0
system undo block           0          0
undo header            109487    2237121
undo block              73679     503486

14 rows selected.

After add another 3 rollback segment.


Tue Feb 06
page    1

CLASS                   COUNT       TIME
------------------ ---------- ----------
data block            7253012    6505054
sort block                  0          0
save undo block             0          0
segment header            736       4273
save undo header            0          0
free list                   0          0
extent map                  9          7
bitmap block                0          0
bitmap index block          0          0
unused                      0          0
system undo header          0          0
system undo block           0          0
undo header            109494    2237123
undo block              73691     503498

14 rows selected.



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