Max users

Hi all. I would like to know what is the maximum number of concurrent users/sessions in oracle. Can i have 100 000 concurrent connections to my database and each one doing very low activity ( 1 small query each minute)?

Hello,
You can but remember every time you establish a connection even though it's ideal it allocated .5MB to hold connection information. In addition is your OS would be able to allocate resources for that many procceses spawning.
You need to look into followng initialization parameter and server memory and configure them accordingly.
Also what is PGA target is set to?
Session
transactions
processes
I won't recommend allowing that many connections unless you got some server with 100 gigs of RAM and Big SGA and PGA>
Regards
Edited by: OrionNet on Feb 21, 2009 10:45 PM

Similar Messages

What's the semantic of "max user processes" (ulimit)

Hello everyone,
I don't understand the behaviour of ulimit, have a look at this shell dump:
$ ps hax | wc -l
120
$ ps h -u myUsername | wc -l
35
$ ulimit -Su 78
$ ps h -u myUsername | wc -l
bash: fork: retry: No child processes
bash: fork: retry: No child processes
bash: fork: retry: No child processes
bash: fork: retry: No child processes
bash: fork: Resource temporarily unavailable
$ ulimit -Su 80
$ ps h -u myUsername | wc -l
35
$
If I am currently running 35 processes, one would assume that >35 more should be sufficient to start two more processes - but obviously it isn't.
In this case, I needed at least "ulimit -Su 80" to start ps and wc.
If I set the "max user processes" limit to 79, the first four error messages change from "bash: fork: retry: No child processes" to "bash: fork: retry: Resource temporarily unavailable"
Can somebody explain this bevahiour to me, please? Why am I not allowed to create new processes, although the limits should be sufficient?

Apologies for the necro-bump but I hope this will help others.
ulimit -u does not give you the max number of processes rather it displays the max number of threads. To list the number of threads a user is currently using:
ps -L -u myusername | wc -l
The output from the above two commands can now be compared and allow you to set the appropriate ulimit.

How to increas the max user process number in Solaris 11?

Hey
Could anyone told me how to increas the max user process number in Solaris 11? I tried below as described in https://blogs.oracle.com/hasham/entry/solaris_10_increasing_number_of , but it cannot work.
set pidmax=60000
set maxusers = 4096
set maxuprc = 50000
set max_nprocs = 50000
Thanks!
Edited by: 966272 on Oct 18, 2012 7:38 AM

Perhaps you should work your original forum post:
Oracle 11g installation fail on Solaris 11 64bit - ORA-00443
through to a resolution before you complicate things that likely don't apply.
You make an assumption in that other post about exceeding various maximums. That may be true or it may not be true. Since the installation of a database program seems to be your actual expectation, go work that forum thread instead.

Changed Ulimits values for the Oracle user and getting error -bash: ulimit: max user processes: cannot modify limit: Operation not permitted when logging in.

I'm trying to increate the ulimits for max user processes and open files for the oracle user. I've set the values in limits.conf, /etc/profile and in oracle's environment scripts. Now when I log in as oracle I get the below errors. If I change the ulimits back to the original values errors go away but ulimits aren't changed.
login as: oracle
[email protected]'s password:
Last login: Fri Mar 6 09:56:02 2015 from mtkadmin12
You are logging onto an Oracle system.
Kickstarted on: 2014-06-05
-bash: ulimit: max user processes: cannot modify limit: Operation not permitted
-bash: ulimit: max user processes: cannot modify limit: Operation not permitted
[oracle@servername ~]$

Thanks for the update.
I modified the /etc/security/limits.d/90-nproc.conf and added a line for oracle and also modifed the oracle.sh file. The ulimits are setting correctly when I su - oracle but they are still wrong when sshing in as oracle.
[root@mtkdevorap11d-1 ~]# su - oracle
[oracle@mtkdevorap11d-1 ~]$ ulimit -Ha
core file size          (blocks, -c) unlimited
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 1030982
max locked memory       (kbytes, -l) 94371840
max memory size         (kbytes, -m) unlimited
open files                      (-n) 65536
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) unlimited
cpu time               (seconds, -t) unlimited
max user processes              (-u) 16384
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited
[oracle@mtkdevorap11d-1 ~]$
[oracle@mtkdevorap11d-2 ~]$ ssh mtkdevorap11d-1
Last login: Mon Mar 16 13:04:16 2015 from mtkdevorap11d-2.conveydev.com
You are logging onto an Oracle system.
Kickstarted on: 2014-06-05
[oracle@mtkdevorap11d-1 ~]$ ulimit -Ha
core file size          (blocks, -c) unlimited
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 1030982
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 4096
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) unlimited
cpu time               (seconds, -t) unlimited
max user processes              (-u) 16384
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited
[oracle@mtkdevorap11d-1 ~]$

Implementing max user sessions settings for TACACS with ACS 5.3

I'm a little confused about the configuration of max user sessions for device administration with TACACS.
When I've changed the configutration of unlimited sessions for a value in Access Policies > Max User Session Policy > Max Session User Settings
I think this value could limit the maximum number of sessions for each user, but instead this value limit in a global meaning all of my sessions.
For example: I need to limit the session for my users in 2.
user1 = Max 2 sessions
user2 = Max 2 sessions
user3 = Max 2 sessions
Whe i Put the value of 2 in Max Session User Settings
user1 + user2 + user3 = Max 2 sessions
This is a limitation of ACS 5.3 or my configuration needs something aditional.

Luis,
Are you saying that when you authenticate with user1 and user 2 that user3 isnt able to get access?
Do you have tacacs accounting enabled on the network access device?
Also what do you have configured for the group settings? If there is a maximum group setting and all the users are a member of the same group then the lesser of the two will be enforced. So if the group max sessions is set to 1 then the all users in that group will have a max session of 1.
Here is some reference material.
http://www.cisco.com/en/US/docs/net_mgmt/cisco_secure_access_control_system/5.3/user/guide/access_policies.html#wp1162177
Thanks,
Tarik Admani

-bash: ulimit: max user processes: cannot modify limit: Operation not permi

Hi,
Installed 10g Forms&Reports only on RHEL 3ES.
Modified /etc/profile according to Oracle's documentation:
if [ $USER = "oracle" ]; then
if [ $SHELL = "/bin/ksh" ]; then
ulimit -n 16384
ulimit -p 16384
else
ulimit -u 16384 -n 16384
fi
fi
But when I logon to the server, the following message shows:
"-bash: ulimit: max user processes: cannot modify limit: Operation not permitted"
What is the problem here?
Thanks
Stephan

Hi,
Installed 10g Forms&Reports only on RHEL 3ES.
Modified /etc/profile according to Oracle's documentation:
if [ $USER = "oracle" ]; then
if [ $SHELL = "/bin/ksh" ]; then
ulimit -n 16384
ulimit -p 16384
else
ulimit -u 16384 -n 16384
fi
fi
But when I logon to the server, the following message shows:
"-bash: ulimit: max user processes: cannot modify limit: Operation not permitted"
What is the problem here?
Thanks
Stephan

Forms max user session 11gR2

Hi,
I have three simple questions, can anyone help me to find out the answers.
What is the max user session for oracle forms 11.1.2.1 version?
If the max user sessions limit reached how can we handle it?
How can i get max user session for forms 11.1.2.1 version through sql code?
Thank You!
Dilli Babu. S

What is the max user session for oracle forms 11.1.2.1 version?
How can i get max user session for forms 11.1.2.1 version through sql code?
Not sure what you mean by "max user session", but since you mention sql code, then I have to think that you mean database sessions. If so, you can check out SESSIONS parameter :
SQL> sho parameter sessions
If you mean something different, please clarify.

EIM 4.3.2 - Max User Load

Hello,
We have set our agents max user load to 3 in order to keep our agents comfortable with their foreseen workload.
A question came up today, that I can not find a work around for.
If a supervisor receives an important email that they need to transfer to a specific agent, how can they do this, if the agent's workload is at their max (the agent does not show up in the transfer list when their max limit is full).
Hope someone can help on this one!
Thanks
Barry

Supervisor would contact the agent,
agent marks themselves un-available and transfer existing work to a queue,
now this agent will be available and supervisor can transfer.

Restricting Max users login

Hi experts,
i want to restrict the max users login in sap gui. because sombody unknownly login in the production sytem with other user ids.
cheers
deepak

Deepak,
login/multi_login_users
List of excepted users, that is, the users that are permitted to log on to the system more than once.
Ex as follows:
Valid Input, Formats, Areas:
List the user IDs separated by commas ",".
Blanks before/between user names are not allowed!
Correct: login/multi_login_users=ALPHA,BETA,GAMMA,DELTA
Incorrect: login/multi_login_users= ALPHA, BETA,GAMMA , DELTA
Hope this helps.
Cheers,
Praveen

Waht's the max-users of MeetMe , conference ,7936 conference station

What's the max-users of MeetMe , conference ,7936 conference station,How to change the number ?

the maximum 'conferees' of a conference call are limited by the type/number of DSPs and the codec(s) used.
see the following link for tables on theoretical maximums.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/vvfax_c/callc_c/ccm_c/intcnf2.htm
this link shows RTR based DSP tables. a 6608 blade in a catalyst can handle g711/g723/g729, maximum 16 conferees per conference.
the number of sessions differs as well depending on the type/number of DSPs and codec(s) used.

Max users for a chatroom seems to be 30?

Running 10.5.8, iChat Server. I have a chatroom that seems to max out at 28-30 users. I tried creating a "persistent room" using a jabber script, but it still seems to max out at 30 users even though I specified 100. Is there any way to modify this? Surfing config data for jabberd2 seems to be pretty sparse on info for this, same with the documents for muc.

My searches behave a little differently. Maybe this will be helpful.
I have some messages from numeric sources. Say one of them is 12345678. I find that if I search for "1234", I can find the message, even though 12345678 never appears in the body of the text. But if I search for some string not at the beginning of the message, like "4567" or "5678", I cannot find it.
So the conclusion seems to be search for a string at the start of the name.

Airport Express Booting Users (max users?)

Hi everyone,
So here's the problem. I live in a residence hall, and I have my Airport Express setup with password because I'm aware of the 10 person limit. I've only given the password to connect to my two roommates and the three of us are the only ones using the Airport Express right now. Sometimes, when I open my laptop to connect, it does, but in the process it boots one of the other machines off the network. The process repeats if the booted machine tries to connect again - the oldest connection is kicked.
I assume this is happening because the Airport Express thinks that it has reached its maximum user limit of 10 simultaneous connections. However, when I open the Airport Utility it states that there are only 6 wireless clients (not only that but among the three of us we only have 8 wireless devices: a mix of laptops, iPhones, a PS3, and a wireless printer).
So it seems that my Airport Express can only support a max of 6 users. Is there any way to alleviate this problem, or can anyone think of another reason this is happening? Thanks in advance.

Bump...does anyone have an idea why this would be happening??

Max users extreme

greetings
I need some data from those that know this stuff better than I.
What is the Max Number of users we can connect to an Airport base station?
answer = theoretical 54 right? okay
What is the real world answer?
at what number can we expect slow downs and delays; yes I know it depends on what they are doing. lets say thay are downloading, and streaming 256k streams.
54mb/s / 256k = 210,.. i dont think so.
here is my problem. I have multiple lab situations 20+ compuers all wireless, and despite my explanations people still don't understand why if the Access Point is 54mb/s why 20 machines would be so slow. Sorry i dont have throughput for you, but I can say that manytimes nothing comes down, and they all have to wait for the same page to load. This I explain is due to the shared nature of Access point.
I need some numbers, can anyone break it down for me?
thanks
--jeff

The maximum number of simultaneous wireless client connections is 50.
The real-world data transfer speed of an 802.11g wireless connection is - under optimal conditions - around 20-24Mbps.
As you already referred to, it isn't really possible to provide you with the "real world" maximum number of wireless client connections since it depends entirely on what those clients are doing. If you had the maximum 50 client connections and all clients only used their network connection for email - there won't be any noticeable performance issues. On the other hand, if only a single wireless client spent the entire day downloading/uploading files between their computer and the internet or another computer on the LAN, that one user could easily require the full available bandwidth.
What I can tell you - a computer lab of twenty wireless clients all doing web browser is likely to lead to intolerably poor performance. A network of this size should really be cabled.
Another thing to consider - the speed of the connection to the internet itself.

"Authentication failed" - exceeding Airport Extreme's max users with less than 10 devices connected?

I am running an Airport Extreme with two Airport Expresses on my network. There are two macbook pros, two iphones, two ipads, a PS3 and a chromecast in the household, a max of probably 5 or 6 of which are turned on at any given time. Normally everything works perfectly, but occasionally my wife or I will get an "authentication failed" message while trying to log onto our home network, and after wasting time resetting the router, checking settings, etc, the only sure fire way to reconnect seems to be to make sure the chromecast and a couple of the iphones are turned off.
If I remember correctly, the max number of connections to an airport extreme is 50? Obviously not ideal but it shouldn't be refusing connections when 6 or 7 devices are trying to hook up. We have had the same issue when firends come to visit. I can't find any obvious problems in the airport setup, and I have my DHCP range set from xx.xx.xx.2 to 200.
Any ideas?

is it the same device generating the error
i have had up to 40 devices on a single extreme maybe with 10 actively working others when needed with no issue

Max users on standard edition

hello
how much simultanious connection could be on oracle 10g standard edition, and how much on entreprise edition?
thanks

Hi,
There is no difference. In fact the max connections are limited by the PROCESSES and SESSIONS initialization parameters.
http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14237/limits004.htm#i288165
Cheers

Max users in Discoverer 11.1.1.3

HI Experts,
we need your assistance.
upgraded the Discoverer 9.0.4 to 11g ( 11.1.1.3) with cumilative patchset.
Middletier is on RHEL 5. with 8 processor and 25 gb ram server .
when we have tested it ( with users) only 500 could able to login other will get either "viewer is busy" or "processing your request".
please note that maxprocs in opmn.xml is 2000 and maxsessions in configuration.xml is 2000.
please let me know why only we were able to establish 500 connections at a particular time
is there anything need to be tuned from weblogic end
had anybody observed this in thier systems and applied any fix , if yes pls let us know
thanks

Hi
I would suggest you to check file webcache.xml under $ORACLE_INSTANCE/config/WebCache/webcache1
there are couple of parameters
"<RESOURCELIMITS MAXINBOUNDCONNECTIONS="500" MAXCACHESIZE_MB="500"/>"
try to modify these parameters and let me know in case you still have issues.
Thanks
Vaseem.

Max users

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