Hidden parameters sometimes ease the life of DBA but be carefull while using them Oracle usually does not support the usage of hidden parameters without their knowledge and you cant even know the side effects of the parameter.
Here is the query you can use to view the values of hidden parameter. (use it with sys user with sysdba privilages)
/* hidden parameters */
select a.ksppinm name,
b.ksppstvl value,
b.ksppstdf deflt,
decode
(a.ksppity, 1,
‘boolean’, 2,
‘string’, 3,
‘number’, 4,
‘file’, a.ksppity) type,
a.ksppdesc description
from
sys.x$ksppi a,
sys.x$ksppcv b
where
a.indx = b.indx
and
a.ksppinm like ‘\_%’ escape ‘\’
order by
name
Footnote 27/07/2009: I personally start to use Tanel Poder’s script to search both hidden and normal parameters
Coskan's Approach to Oracle 
[…] you can query the list of undocumented parameters with the script mentioned before “how to view list of hidden parameters“ […]
Pingback by Setting or Resetting /Unsetting Parameters « Coskans Approach to Oracle — March 7, 2007 @ 2:19 pm
HI,
I’ve tested your query and it didn’t worked out of the box. I had to change the view names to those ones;
sys.X_$KSPPI a,
sys.X_$KSPPSV b
I’m running a 10.1.0.5.0 instance.
Otherwise thanks for sharing the info with us.
Regards.
Comment by Jeboss — June 1, 2007 @ 8:03 am
I didn’t try the script on 10.1.0.5 before, I tried it on 10.2.0.1 and 10.1.0.4 it worked both on these version if I have chance to use 10.1.0.5 I will try it thanks for the feedback Jeboss
Comment by coskan — June 1, 2007 @ 8:08 am
Hi!
How does one change the hidden parameters?
Regards
Comment by Michael — July 2, 2007 @ 8:40 am
you can set them by using quotes
for instance;
sys@XE> alter system set “_abort_recovery_on_join”=true;
System altered.
since they are undocumented, you must use them carefully
Comment by coskan — July 2, 2007 @ 9:06 am
Thanks a lot!
Comment by Michael — July 2, 2007 @ 9:30 am
Hi again!
We are upgrading our database from 9.2.0.5 to 10.2.0.2.
We are also using Applications 11i and according to the documentation we should remove a lot of init parameters.
My question is: Should I remove parameters that are not in the pfile such as always_anti_join, enqueue_resources and so on. The Metalink Document 216205.1 also tells us to remove a lot of hidden parameters. How do you remove hidden parameters?
Thanks for your support!
Comment by Michael — July 2, 2007 @ 12:10 pm
there are two ways to do this
1- resetting parameter on the spfile
idle> alter system reset “_abort_recovery_on_join” scope=spfile sid=’*’;
System altered.
scope connot be both it is said it can be but I couldn’t do so scope is for only pfile or spfile
2- if you are using init.ora then when you remove the line of the undocumented parameter it will take its default value. init.ora file has entries only for non-default values if you remove the entry then it will take the default value after the next startup.
in my opinion you must consult to oracle support for this kind of upgrades.
best wishes
Comment by coskan — July 2, 2007 @ 12:38 pm
Only quotes appears to be an issue. This is script working fine on all version of 10g database.
select a.ksppinm name,
b.ksppstvl value,
b.ksppstdf deflt,
decode
(a.ksppity, 1,
‘boolean’, 2,
‘string’, 3,
‘number’, 4,
‘file’, a.ksppity) type,
a.ksppdesc description
from
sys.x$ksppi a,
sys.x$ksppcv b
where
a.indx = b.indx
and
a.ksppinm like ‘\_%’ escape ‘\’
order by
name
Comment by Ramnik — October 19, 2007 @ 4:04 pm
How is it possible to know to default value for a modified parameter ?
Comment by poleta33 — November 30, 2007 @ 10:26 am
Hi,
I just created an Oracle 10.2.0.1 datbase on Solaris with a very basic init.ora file. I ran your query to check the current and default values of the hidden parameters (it worked by just changing to single quotes, as an earlier reader noted).
I found that the current value for _like_with_bind_as_equality
is FALSE, although the default value appears as TRUE.
How can this be – since I have not ever changed any hidden
parameter on any database, and no one has access tho this one other than myself ?!
Thank you!
Comment by Chris Emmonds — January 25, 2008 @ 2:05 am
The DEFAULT means if the value is the default or not that column is the indicator only.
When it is TRUE it is the default value which means you did not set it . When it is FALSE it means the parameter modified.
If you add the line below to the where clause it will brings you the parameters which are modified.
and b.ksppstdf=’FALSE’
Comment by coskan — January 28, 2008 @ 12:07 pm
The script does indeed need the table reference “X$KSPPCV” changing to “X$KSPPSV” to make it work on 10.2.0.4 on AIX.
Otherwise great.
Cheers
Jeff
Comment by Jeff Moss — October 8, 2008 @ 4:45 pm
The script works with 11.1.0.6 too. Thanks.
Ittichai
Comment by ittichai — December 14, 2008 @ 6:43 am
[…] In addition to that it allows you peek into the current values of some hidden parameters too. This is a good alternative to having to run a query like below; Sample below is looking for a value of the “_b_tree_bitmap_plans” parameter. I got this code from Coskan’s blog. […]
Pingback by See initialization parameters from memory « Oraexplorer’s Blog — January 14, 2009 @ 3:29 am
[…] In addition to that it allows you peek into the current values of some hidden parameters too. This is a good alternative to having to run a query like below; Sample below is looking for a value of the “_b_tree_bitmap_plans” parameter. I got this code from Coskan’s blog. […]
Pingback by OraExplorer » See initialization parameters from memory — January 21, 2009 @ 4:45 am
Thank you, it is very useful to km=now, but are there a perfect INIT.ORA parameters file setting can be used as an initial trial for high database performance ?
Comment by Montaser Salem — April 8, 2011 @ 7:12 pm
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Pingback by How to view list of hidden parameters « Coskan’s Approach to Oracle « Oracle jgaicc — April 27, 2011 @ 3:40 pm
simple solution is ” create pfile from memory;” it will show hidden parameters also. very easy to remember and very easy to work with also using vi editior
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Comment by Bettie — October 17, 2014 @ 6:41 am
script works with 12.1.0.2 as well…with a little formatting added.
col name format a50;
col value format a12;
col type format a8;
col description format a70;
col deflt format a6;
select a.ksppinm name, b.ksppstvl value, b.ksppstdf deflt, decode(a.ksppity, 1,
‘boolean’, 2, ‘string’, 3, ‘number’, 4, ‘file’, a.ksppity) type, a.ksppdesc description
from sys.x$ksppi a, sys.x$ksppcv b
where a.indx = b.indx
and a.ksppinm like ‘\_%’ escape ‘\’
order by name
/
Comment by Mark McCrory — March 1, 2016 @ 9:45 am
Hi Mark,
If we would like to know whether hidden parameters are static or dynamic, how we will come to know.
Appreciate your inputs
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