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Find Oracle segment header contention

However, segment header contention will still occur when concurrent tasks attempt to INSERT into the same table, and multiple freelists are required to remove these sources of buffer busy waits.

If you are using Oracle9i and above, you also have a way of finding out what objects have been the source of buffer busy waits.  The bufobjwaits.sql script will tell you everything you need to know:

See Code depot for complete script

 
select
       owner,
       object_name,
. . .
from
       sys.v$segment_statistics
where
       (statistic_name = 'buffer busy waits' and value > 0)
order by
      1,2;
 
 
 
OWNER     OBJECT_NAME   OBJECT_TYPE    WAITS
--------------------------------------------
USR1      TAB1           TABLE             3
USR1      TAB2           TABLE             2
USR1      TAB3           TABLE             2

The above is an excerpt from Oracle Performance Troubleshooting by Robin Schumacher.

It's only $19.95 and you can order it and get instant access to the Oracle scripts here:

http://www.rampant-books.com/book_2003_1_perf.htm

 

 

 

 
 
 

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