Maximum number of processes a user can run

Is there a parameter that defines the maximum number of processes that a user can run?

hi,
there are no maximum process per user. There is maximum session per user, by default, it is 6. But you can change it. But usually, SAP Go Live Check would suggest you to reduce it to 2 or 3.
ardhian
http://ardhian.kioslinux.com
http://sapbasis.wordpress.com

Similar Messages

  • How to change the maximum number of process per user in BW ?

    Hi,
    Do you know how to change the maximum number of process allowed per user ?
    With RSRT we can customize the number of process per query but I don't know where we can customize the maximum number of process per user.
    In fact, my production environment reach always the max number of process available in SM50...
    Thanks a lot

    Hi,
    A user is not have the No. of processor but a work process can handle N No. of users. If a user hit any transaction v acn say from  a list of N worl proceesor which has been taken the work.
    Correct if I am wrong.
    Regards
    Syed.

  • ORA-Error: Maximum number of Processes exceeds

    Hi,
    Today we got one Oracle error: Maximum number of Processes exceeds while connects to our Oracle Database.
    We have application running on our DB, which have 50 threads running and making connection to Oracle Schema.
    In our init.ora file the Processes Parameter is set to 50.
    But we also have another init<Schema Name>.ora file which has Processes Parameter as 50.
    When I search on this error, I got that it is due to no. of user processes on Oracle instance.
    What are these user processes exactly?
    If we set the Processes Parameter as 150, and we have RAC environment with 3 Cluster, does it means we have 150*3 processes can run at a time.
    The other doubt I have is that: Is this parameter is instance based, SID based or cluster based?
    Please provide some input on this.
    Thanks in Advance.
    Manoj Macwan

    If you don't issue
    alter system set processes=150 scope=both sid='<your instance 1>'
    all instances will be allowed to fork 150 processes.
    The other poster is incorrect.
    Sybrand Bakker
    Senior Oracle DBA

  • Java.lang.Exception: ORA-00020: maximum number of processes (150) exceeded?

    When i run my web-application with the embedded OC4J server, the following error message is prompted:
    java.lang.Exception: ORA-00020: maximum number of processes (150) exceeded
         void MyFolder.objects.MyObject.<init>(oracle.jbo.ApplicationModule, java.lang.String, java.lang.String, javax.servlet.http.HttpServletRequest)
         void MyFolder.servlet.MyServlet.doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
         void javax.servlet.http.HttpServlet.service(com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse)
         void javax.servlet.http.HttpServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
         void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
         void com.evermind.server.http.ServletRequestDispatcher.invoke(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
         void com.evermind.server.http.ServletRequestDispatcher.forwardInternal(javax.servlet.ServletRequest, javax.servlet.http.HttpServletResponse)
         boolean com.evermind.server.http.HttpRequestHandler.processRequest(com.evermind.server.ApplicationServerThread, com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse, java.io.InputStream, java.io.OutputStream, boolean)
         void com.evermind.server.http.HttpRequestHandler.run(java.lang.Thread)
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    Question:
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    - I intended to deploy my application to 9IAS server. Will the same problem occurs too?
    Thanks for your reply!

    Hi Pig,
    When i run my web-application with the embedded OC4J server, the following error message is prompted:
    java.lang.Exception: ORA-00020: maximum number of processes (150) exceeded
         void MyFolder.objects.MyObject.<init>(oracle.jbo.ApplicationModule, java.lang.String, java.lang.String, javax.servlet.http.HttpServletRequest)
         void MyFolder.servlet.MyServlet.doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
         void javax.servlet.http.HttpServlet.service(com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse)
         void javax.servlet.http.HttpServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
         void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
         void com.evermind.server.http.ServletRequestDispatcher.invoke(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
         void com.evermind.server.http.ServletRequestDispatcher.forwardInternal(javax.servlet.ServletRequest, javax.servlet.http.HttpServletResponse)
         boolean com.evermind.server.http.HttpRequestHandler.processRequest(com.evermind.server.ApplicationServerThread, com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse, java.io.InputStream, java.io.OutputStream, boolean)
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    Question:
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    From the Oracle error message documentation:
    ORA-00020 maximum number of processes (string) exceeded
    Cause: All process state objects are in use.
    Action: Increase the value of the PROCESSES initialization parameter.
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    database connections and/or restrict the number of database connections used by the application. For example, if your application
    has declared many root ApplicationModules (i.e. more than one ApplicationModule pool is in use) then it may help to enable the
    jbo.doconnectionpooling switch so that each ApplicationModule instance in the pools does not maintain a dedicated database
    connection while not in use. Another alternative if you are using the BC4J connection pool (not a JDBC datasource) may be to
    restrict the number of connections the pool can create to < 150 with the jbo.maxpoolsize switch. However, please note that this
    may have an impact on throughput.
    - I intended to deploy my application to 9IAS server. Will the same problem occurs too?.
    This is a database issue. So, yes.
    Hope this helps.
    JR

  • ASM issue ORA-00020: maximum number of processes (%s) exceeded (DBD ERROR)

    Hi All,
    i am running 10.2.0.3 with ASM (10.2.0.3) on SunOS (solaris 5.9)
    +ASM1> ps -ef | grep pmon
    oraunity  6174     1   0   Jan 01 ?         298:37 ora_pmon_UNITYQ1
    oraunity  6480     1   0   Dec 31 ?          84:21 asm_pmon_+ASM1
    oraunity  6085     1   0   Mar 09 ?         127:05 ora_pmon_UNIINFQ1
    oraunity 11442     1   0   Jan 01 ?         253:54 ora_pmon_UNIDWHQ1One of rdbms instanace UNIINFQ1 got some failuer due to archival error 'ORA-00257:Archiver error:connect internal only:until freed.'
    To drill down that, i tried to log in to +ASM1 instance to see space utilization under ARCH destination
    SQL> show parameter db_name
    NAME                                 TYPE        VALUE
    db_name                              string      UNIINFQ1
    log_archive_dest                     string      +UNITY_DG1/UNIINFQ1/archi tried following to log in to +ASM1
    UNITYQ1> export ORACLE_SID=+ASM1
    +ASM1> echo $ORACLE_SID
    +ASM1
    +ASM1> export ORACLE_HOME=/unity-rc001-q/ora01/app/oracle/product/10.2.0/asm10g
    +ASM1> echo $ORACLE_HOME
    /unity-rc001-q/ora01/app/oracle/product/10.2.0/asm10g
    +ASM1> sqlplus / as sysdba
    SQL*Plus: Release 10.2.0.3.0 - Production on Wed Jun 10 00:44:35 2009
    Copyright (c) 1982, 2006, Oracle.  All Rights Reserved.
    Connected.
    SQL> select * from v$instance;
    select * from v$instance
    ERROR at line 1:
    ORA-01012: not logged onthen i did following
    +ASM1> asmcmd
    ORA-00020: maximum number of processes (%s) exceeded (DBD ERROR: OCISessionBegin)
    [oraunity] mhs-clust5-qa:/unity-rc001-q/ora01/app/oracle/admin/UNIINFQ1/bdump:i have also noticed high number of BEQUETH connections to +ASM1 instance
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    oraunity  6486     1   0   Dec 31 ?         193:20 asm_lmon_+ASM1
    oraunity  6533     1   0   Dec 31 ?          11:49 asm_ckpt_+ASM1
    oraunity  6482     1   0   Dec 31 ?         108:29 asm_diag_+ASM1
    oraunity  6527     1   0   Dec 31 ?           9:28 asm_mman_+ASM1
    oraunity  6210     1   0   Mar 09 ?           8:03 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity  6484     1   0   Dec 31 ?           7:40 asm_psp0_+ASM1
    oraunity  6488     1   0   Dec 31 ?         221:17 asm_lmd0_+ASM1
    oraunity  6480     1   0   Dec 31 ?          84:21 asm_pmon_+ASM1
    oraunity  6529     1   0   Dec 31 ?           8:42 asm_dbw0_+ASM1
    oraunity  6535     1   0   Dec 31 ?           6:45 asm_smon_+ASM1
    oraunity  6523     1   0   Dec 31 ?         241:24 asm_lms0_+ASM1
    oraunity  6531     1   0   Dec 31 ?           9:22 asm_lgwr_+ASM1
    oraunity  6537     1   0   Dec 31 ?           9:03 asm_rbal_+ASM1
    oraunity  6539     1   0   Dec 31 ?          14:36 asm_gmon_+ASM1
    oraunity  6575     1   0   Dec 31 ?          45:59 asm_lck0_+ASM1
    oraunity  6328     1   0   Jan 01 ?          15:08 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity  7866     1   0 16:09:10 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity  6941     1   0 16:24:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 11553     1   0   Jan 01 ?          42:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity  5010     1   0 16:23:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity  1171     1   0 16:21:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 26147     1   0 16:18:49 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 17948     1   0 16:14:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 16097     1   0 16:13:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 19867     1   0 16:15:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 14221     1   0 16:12:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 25640  4784   0 02:36:15 pts/4       0:00 grep +ASM1
    oraunity  8513     1   0 16:09:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 23732     1   0 16:17:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity  7864     1   0 16:09:09 ?           0:19 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity  3109     1   0 16:22:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 27439     1   0 16:19:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 10400     1   0 16:10:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity  5588     1   0 16:23:49 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 16667     1   0 16:13:48 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 21832     1   0 16:16:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 12308     1   0 16:11:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 29330     1   0 16:20:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
    oraunity 25581     1   0 16:18:30 ?           0:00 oracle+ASM1 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))Can anyone help me to solve this issue without shutting down +ASM1. (this instance is used by rest 3 databases as well..so down time is not feasible)
    Regards,
    Bhavik Desai

    You should check alert log file on database like Alex told you.
    And please post Error ;)
    But If You can access +ASM, Or ...by the way... if you stop database ... try to check ASM diskgroup.
    $ export ORACLE_SID=+ASM1
    $ sqlplus / as sysdba
    SQL> set lines 130
    SQL> set pages 10000
    SQL> select NAME, TOTAL_MB, FREE_MB from v$asm_diskgroup;
    If your DISKGROUPs for archivelog on DB full... backup or delete them
    (please start database mount mode)
    $ export ORACLE_SID=DB1
    $ sqlplus / as sysdba
    SQL> startup mount;
    SQL> show parameter log_archive_dest
    backup archivelog
    $ rman target /
    RMAN> backup ARCHIVELOG ALL DELETE INPUT format 'ARCH_%d_%U' ;
    or delete
    $ rman target /
    RMAN> delete ARCHIVELOG ALL ;
    After that ...
    $ sqlplus / as sysdba
    SQL> alter database open
    This justs my suggestion, if your database has the problem with ASM diskgroup full ... because archvielog...
    By the way... please post your result from ASM query and alert log file
    Good Luck

  • ORA-00020: maximum number of processes 1000 exceeded

    Hello,
    Oracle 10.2.0.4.0
    O/S: Windows Server 2003-64 bits
    RAM: 32Gb
    Instance: opext
    show SGA
    Total System Global Area 10284433408 bytes
    Fixed Size 2180960 bytes
    Variable Size 1574353056 bytes
    Database Buffers 8690597888 bytes
    Redo Buffers 17301504 bytes
    Today at 8:01 am we've got this error:
    ORA-00020: maximum number of processes 1000 exceeded
    That incident was reported in a trace file (opext_ora_8240.trc):
    Dump file c:\oracle\product\10.2.0\admin\opext\bdump\opext_ora_8240.trc
    Tue Jul 31 08:01:03 2012
    ORACLE V10.2.0.4.0 - 64bit Production vsnsta=0
    vsnsql=14 vsnxtr=3
    Oracle Database 10g Release 10.2.0.4.0 - 64bit Production
    Windows NT Version V5.2 Service Pack 2
    CPU : 8 - type 8664, 1 Physical Cores
    Process Affinity : 0x0000000000000000
    Memory (Avail/Total): Ph:18773M/32767M, Ph+PgF:66964M/80966M
    Instance name: opext
    Redo thread mounted by this instance: 1
    Oracle process number: 0
    Windows thread id: 8240, image: ORACLE.EXE
    ORA-00020: maximum number of processes 1000 exceeded
    Died during process startup with error 20 (seq=212441)
    OPIRIP: Uncaught error 20. Error stack:
    ORA-00020: maximum number of processes (1000) exceededThis was the first time in three years that happened an incident like this. Due my Windows server allows me to setup processes and sessions with a very high value, I did it when configuring this database for the first time.
    select resource_name,initial_allocation, limit_value from V$RESOURCE_LIMIT;
    RESOURCE_NAME     INITIAL_ALLOCATION     LIMIT_VALUE
    processes     1000     1000
    sessions     1105     1105
    transactions     1215     UNLIMITEDI would like to know what application or process made that my database exceeds 1000 processes. I read that one possiblity is that there's a web app that open many connections to database and doesn't close them.
    In my listener.log, I got this at 08:05 am:
    31-JUL-2012 08:05:41 * service_update * opext * 0
    31-JUL-2012 08:05:47 * (CONNECT_DATA=(SERVICE_NAME=opext)(CID=(PROGRAM=c:\windows\system32\inetsrv\w3wp.exe)(HOST=SRVXXX)(USER=NETWORK?SERVICE))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.1)(PORT=36578)) * establish * opext * 0
    31-JUL-2012 08:05:47 * service_update * opext * 0
    31-JUL-2012 08:05:47 * (CONNECT_DATA=(SERVICE_NAME=opext)(CID=(PROGRAM=c:\windows\system32\inetsrv\w3wp.exe)(HOST=SRVXXX)(USER=NETWORK?SERVICE))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.1)(PORT=36579)) * establish * opext * 0
    31-JUL-2012 08:05:47 * (CONNECT_DATA=(SERVICE_NAME=opext)(CID=(PROGRAM=c:\windows\system32\inetsrv\w3wp.exe)(HOST=SRVXXX)(USER=NETWORK?SERVICE))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.1)(PORT=36580)) * establish * opext * 0
    31-JUL-2012 08:05:47 * (CONNECT_DATA=(SERVICE_NAME=opext)(CID=(PROGRAM=c:\windows\system32\inetsrv\w3wp.exe)(HOST=SRVXXX)(USER=NETWORK?SERVICE))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.1)(PORT=36581)) * establish * opext * 0
    31-JUL-2012 08:05:47 * (CONNECT_DATA=(SERVICE_NAME=opext)(CID=(PROGRAM=c:\windows\system32\inetsrv\w3wp.exe)(HOST=SRVXXX)(USER=NETWORK?SERVICE))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.1)(PORT=36582)) * establish * opext * 0
    31-JUL-2012 08:05:47 * (CONNECT_DATA=(SERVICE_NAME=opext)(CID=(PROGRAM=c:\windows\system32\inetsrv\w3wp.exe)(HOST=SRVXXX)(USER=NETWORK?SERVICE))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.1)(PORT=36583)) * establish * opext * 0
    31-JUL-2012 08:05:47 * (CONNECT_DATA=(SERVICE_NAME=opext)(CID=(PROGRAM=c:\windows\system32\inetsrv\w3wp.exe)(HOST=SRVXXX)(USER=NETWORK?SERVICE))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.1)(PORT=36584)) * establish * opext * 12518
    TNS-12518: TNS:listener could not hand off client connection
    TNS-12560: TNS:protocol adapter error
    Host SRVXXX is a server where a web app is and 192.168.1.1 is our firewall. May I think that this server was the one that made so many connections?
    I checked alert.log, trc file and listener.log. What else can I check to determine what was the cause of this incident?

    user521219 wrote:
    Host SRVXXX is a server where a web app is and 192.168.1.1 is our firewall. May I think that this server was the one that made so many connections?
    I checked alert.log, trc file and listener.log. What else can I check to determine what was the cause of this incident?check IIS logs
    It could result from Denial of Service attack or trojan or virus infecting webserver

  • Maximum number of processes (100) exceeded

    Hi!
         I've some php application working with oracle XE with oci8 driver. Application works fine, but with time number of running oracle processes grows and when it reaches 100, it is impossible to to backup:
    RMAN-00554: initialization of internal recovery manager package failed
    RMAN-04005: error from target database:
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    What is interesting, number of processes doesn't affect php application. I think php can reuse existing processes. It is possible that RMAN will reuse existing processes?
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    best regards
    Jarek

    With 11g XE, use DRCP connection pooling for your PHP connections.  See The Underground PHP and Oracle Manual
    Use non-DRCP connections for other jobs.
    It sounds like you are using persistent PHP connections. This is good for performance but if you have a large number of PHP/Apache processes you will reach the DB limits, as you've found. You can tune the number of connections to suit the largest possible number of mid-tier processes in your system. Do this with the 'processes' parameter in the DB. See the "Configuring the Database For Testing" section in the testing chapter of The Underground PHP and Oracle Manual. You could also reduce the number of Apache processes that start, or be more aggressive in expiring them.
    For follow up PHP questions, use the PHP OTN forum.

  • Maximum Number of Sessions per User

    I am using OAM 11.1.1.5.0 running on Solaris 10. When we change the "Maximum Number of Sessions per User" to 1 (per customer requirement), a user is restricted to having one active OAM session at a time (as expected). However, if the user does not explicitly log out (e.g. they just close their browser), they are unable to log back in to OAM until their existing OAM session times-out/expires. Given the above max sessions of 1 requirement, is it possible to config OAM to auto-kill the user's session and create a new one if they attempt to login before their initial OAM session times-out/expires? This was possible in Sun's Access Manager. Is it possible in Oracle's OAM? Thank you in advance for your reply.

    Hi,
    Maximum session per user 0-9 and how can configure see the below link:-
    http://help.sap.com/saphelp_nw70/helpdata/en/97/76a341ac57ef0be10000000a1550b0/content.htm
    Regards,
    Anil

  • ORA-00020: maximum number of processes (500) exceeded

    Problem Details:
    In our Database we are getting huge number of open connection from remote system.
    Let say, our application A and remote application name is B.
    Some common users of application A are USER0, USER1, USER2.
    Remote Application B uses USER0 to create views on application A's table through Database Link.
    Those views (nearly 100) are accessed in application B at several places from the Java code.
    Since those views are getting called almost all the times from the application B's code, DB link is in use almost all the time - holding many number of connections (check the first row of the query output).
    Many times the open connections remaining high and any other application, users trying to connect to application A,
    getting the ORA-00020 error.
    Note :
    1. Application B is very old application and does not use open DB link or close DB link.
    2. Application B tried with "alter session close Database link xxx", it decrease the number of open connection but its degrading the performance of application B at large scale.
    3. To cope up with this problem Application A recently incraesed the parameter process=500, but not sure if this limit can also be broken through Application B
    Questions/Doubts:
    1) What is best approach to handle this problem??
    'alter session close database link xxx' is the only option from application B's point ??
    What other approach can be taken??
    2) We are not sure the risk associated with increasing the process parameter value ??
    Appreciate your suggestion !!
    SQL>conn / as sysdba
    SQL> select substr(username,1,8),
           substr(machine,1,11),
           substr(module,1,40),
           substr(osuser,1,7),
           status,
           count(1)
      from v$session
      group by username, machine, module, osuser, status;
    USERNAME MACHINE     STATUS                        OSUSER     COUNT(1)
    USER0    remotedb9      INACTIVE                              oracle        450
    USER1    app_dev        INACTIVE                              beaadmin        1
    USER0    svr01test      ACTIVE                                bdgp_dev        1
    USER1    app_test       INACTIVE                              bbk09           2
    USER0    app_dev        ACTIVE                                dj0494          1
    USER1    app_test       INACTIVE                              pd0269          2
    USER2    app_test       INACTIVE                              oracle         12
    USER0    app_dev        ACTIVE                                oracle          2
    USER2    app_test       INACTIVE                              www             8
    USER2    dbr9db01       ACTIVE                                oracle          2
    USER2    svr01dv        INACTIVE                              bdgp_dev        1
    USER0    app_dev        INACTIVE                              scott           3
    USER2    app_test       INACTIVE                              clerk           2
    USER2    moose          ACTIVE                                john            2
    USER2    titan.homer    INACTIVE                              voipdu          1
    NEWUSER  floradbdv1     INACTIVE                              oracle          8
    SYS      app_test       ACTIVE                                oracle          1
    20 rows selected.
    SQL>conn USER0@csmip_st
    Enter password:
    ERROR:
    ORA-00020: maximum number of processes (500) exceeded
    Warning: You are no longer connected to ORACLE.

    semmsl in Linux tells what the max number of processes are. You have to make sure this is equal to the process parameter of all instances plus 10.
    It is usually in /etc/sysctl.conf
    kernel.sem = 250 32000 100 128
    SEMMSL
    The SEMMSL kernel parameter is used to control the maximum number of semaphores per semaphore set.
    Oracle recommends setting SEMMSL to the largest PROCESS instance parameter setting in the init.ora file for all databases hosted on the Linux system plus 10. Also, Oracle recommends setting the SEMMSL to a value of no less than 100.
    SEMMNI
    The SEMMNI kernel parameter is used to control the maximum number of semaphore sets on the entire Linux system.
    Oracle recommends setting the SEMMNI to a value of no less than 100.
    SEMMNS
    The SEMMNS kernel parameter is used to control the maximum number of semaphores (not semaphore sets) on the entire Linux system.
    Oracle recommends setting the SEMMNS to the sum of the PROCESSES instance parameter setting for each database on the system, adding the largest PROCESSES twice, and then finally adding 10 for each Oracle database on the system. To summarize:
    SEMMNS = sum of PROCESSES setting for each database on the system
    + ( 2 * [largest PROCESSES setting])
    + (10 * [number of databases on system]
    To determine the maximum number of semaphores that can be allocated on a Linux system, use the following calculation. It will be the lesser of:
    SEMMNS -or- (SEMMSL * SEMMNI)
    SEMOPM
    The SEMOPM kernel parameter is used to control the number of semaphore operations that can be performed per semop system call.
    The semop system call (function) provides the ability to do operations for multiple semaphores with one semop system call. A semaphore set can have the maximum number of SEMMSL semaphores per semaphore set and is therefore recommended to set SEMOPM equal to SEMMSL.
    Oracle recommends setting the SEMOPM to a value of no less than 100.
    App B could try using connection pooling or something to reduce the number of connections to the DB.

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