Re: DBMS_STATS.GATHER_SYSTEM_STATS - learned something new

Expected behaviour.

Oracle flags whether or not it can use the workload stats (mreadtim/sreadtim/cpuspeed); if not then it applies the cpuspeednw, iotfrrate and whatever the seek time one is called. If you gather workload stats (and they are self-consistent) then Oracle doesn't need to delete the noworkload stats - it's generally principle in Oracle, "don't clean up the mess if you don't need to, it's just more work". (Or as Cary says, the fastest way to do something is to not do it at all - though I doubt if he says that immediately after telling his children to tidy their rooms ;)

Regards

Jonathan Lewis
http://jonathanlewis.wordpress.com/all_postings

Author: Oracle Core (Apress 2011)
http://www.apress.com/9781430239543

• Original Message ----- From: <Christopher.Taylor2_at_parallon.net> To: <oracle-l_at_freelists.org> Sent: Friday, October 12, 2012 4:37 PM Subject: DBMS_STATS.GATHER_SYSTEM_STATS - learned something new

| Version 10.2.0.4
| I see that when you have _NOT_ executed
DBMS_STATS.GATHER_SYSTEM_STATS(gathering_mode=>'NOWORKLOAD') at least once, and you run a regular
dbms_Stats.gather_system_stats(gathering_mode=>'INTERVAL',interval=>&some_amount_of_minutes), that Oracle does not update some of the SYSTEM STATS such as IOTFRSPEED.
|
| IOTFRSPEED stayed at 4096 when using the regular gather. After using
NOWORKLOAD it went to 38883.222, and then regathering stats using interval, it stays at 38883.222.
|
| Weird.
|
| Chris
|
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