RE: How can you log number of rows returned by all queries?

Regarding the "hardcoding" issue, some find it a useful work-around to code up your own release specific xv$<viewname> view that is bare bones but release specific so that you can recode the view easily (except in the rare event that Oracle changes the meaning of a v$<viewname>; if the underlying x$ values change, but you've stuck to things that do appear in v$ places, then you can trace the required revisions needed for your custom view.)  

Quite often, if you want one specific fact from a join of v$ views, a much more efficient custom view can be created without much effort.  

Using the xv$ prefix for these views (which I think is my convention invention and which I recommend) makes it trivial to review v$ changes in a patch or release to see whether you need to do anything about it. If you don't like xv$, you still probably want to use something consistent to make it easy to find them.  

I'm not suggesting that every ad hoc use of joins of v$ objects be thus optimized, but if you have a case such as grabbing a stat or two for every session at logoff (or especially logon) then it is more likely to be a worthwhile exercise.  

mwf  

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Yong Huang
Sent: Tuesday, November 05, 2013 9:18 AM To: Stephens, Chris; cdunscombe_at_yahoo.com Cc: oracle-l_at_freelists.org
Subject: Re: How can you log number of rows returned by all queries?  

Yes. A logoff trigger is a smart idea. Thanks.

Again, this statistic records number of table rows scanned, not number of rows sent to the client (e.g. select count(*) ... returns only 1 row after scanning many).

Yong    

From: "Stephens, Chris" <Chris.Stephens_at_adm.com> To: "yong321_at_yahoo.com" <yong321_at_yahoo.com>; "cdunscombe_at_yahoo.com" <cdunscombe_at_yahoo.com>
Cc: "oracle-l_at_freelists.org" <oracle-l_at_freelists.org> Sent: Tuesday, November 5, 2013 7:40 AM
Subject: RE: How can you log number of rows returned by all queries?

" The problem with this approach is that if the session exited, you lose its data"

Logoff trigger?

-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Yong Huang
Sent: Tuesday, October 29, 2013 11:32 AM To: cdunscombe_at_yahoo.com
Cc: oracle-l_at_freelists.org
Subject: Re: How can you log number of rows returned by all queries?

> Looking for a way of "logging" the number of rows returned by all queries
run by a specific user, running 11.2.0.3? Chris,

How about checking statistic 'table scan rows gotten' for the user's sessions? Join v$session and v$sesstat (and v$statname if you don't want to hardcode statistic# for your version).

The problem with this approach is that if the session exited, you lose its data. You either have to sample more frequently (and replace the value for the same session sampled last time in your record) to minimize this problem, or make sure most other sessions rarely disconnect and get the value for this stat from v$sysstat instead, minus the values for the long-connecting sessions.

Why number of rows? How about logical reads, which you can get from dba_audit_(session|trail) if you have audit turned on, which is default in 11g?

Yong Huang

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