maxthr system statistic

Does anybody have a good understanding of how the maxthr metric is computed or how it's used by the CBO? I'm just curious because I've gathered system stats 5 times in the past few days and keep getting wildly different values for this metric while the rest are relatively constant:  

STATID     STATUS     START_TIME       END_TIME           SREADTIM
MREADTIM   CPUSPEED       MBRC     MAXTHR


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

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

TEST       COMPLETED  01-12-2007 13:23 01-12-2007 14:41      1.667
3.386        707         27     105472
TEST2      COMPLETED  01-15-2007 09:09 01-15-2007 12:06      1.688
3.552        823         37   21226496
TEST3      COMPLETED  01-15-2007 13:45 01-15-2007 16:11      2.389
4.138        749         31     105472
TEST4      COMPLETED  01-15-2007 16:12 01-16-2007 09:10        1.9
4.683        798         43   89126912
TEST5      COMPLETED  01-16-2007 09:11 01-16-2007 16:14      1.709
3        758         23    3595264

 

I already searched the docs, Metalink and Google and couldn't find a good explanation beyond "Maximum I/O throughput is the maximum throughput that the I/O subsystem can deliver."

Thanks,
Brandon  

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http://www.freelists.org/webpage/oracle-l Received on Thu Jan 18 2007 - 17:42:39 CST