how to set ulimit value in solaris 11 permanently

Av - 14 juni, 2021

For Solaris 11, the default for rlim_fd_max is 65536 and the default value for rlim_fd_cur is 256. To just set the ulimit - you can also just put that in your script. I wanna change system open files setting permanently, but it doesn't work. CHECK per process That could be logged by: nice - max nice priority allowed to raise to values: [-20, 19] rtprio - max realtime priority; Exit and re-login from the terminal for the change to take effect. SERVER:/etc # grep -RiI 'MAX_OPEN_FDS' * 2>/dev/null init.d/boot.multipath:MAX_OPEN_FDS=4096 init.d/boot.multipath: if [ -n "$MAX_OPEN_FDS" ] ; then init.d/boot.multipath: ulimit -n $MAX_OPEN_FDS init.d/multipathd:MAX_OPEN_FDS=4096 init.d/multipathd: if [ -n "$MAX_OPEN_FDS" ] ; then init.d/multipathd: ulimit -n $MAX_OPEN_FDS rc.d/boot.multipath:MAX_OPEN_FDS=4096 rc.d/boot.multipath: if [ -n "$MAX_OPEN_FDS" ] ; then rc.d/boot.multipath: ulimit … With any shell, you can always reset both soft and hard limits to their default values by logging out and back in. Note: Not all of these commands will work as not every system incorporates the features. Add two lines for each limit: * soft nofile 16384 * hard nofile 16384. To set tcp_recv_hiwat =1048576 and tcp_xmit_hiwat = 1048576. [oracle@mylinz ~]$ ulimit -S -u 4096 [oracle@mylinz ~]$ ulimit -H -u 8192 [oracle@mylinz ~]$. This is the default on Solaris: As you see, all default values are higher than the required values except for the open file descriptors. I am not sure whether the stack hard limit should be reduced. -H – Hard limit. On AIX: etc/security/limits. To set tcp_conn_req_max_q = 1024 and tcp_conn_req_max_q0 = 2048. On the Cray XT, both RLIMIT_CORE and RLIMIT_CPU limits are always forwarded to the compute nodes. We stopped all the SAS processes and set the ulimit to 2048 (10% of recommended) and was able to successfully bring up the SAS services via the sas.servers script. Luckily, we have “ulimit” command in any of the Linux based server, by which one can see/set/get number of files open status/configuration details. where: SID_A,SID_B,SID_C = processes value per instance. UNIX/Linux operating systems have the ability to limit the amount of various system resources available to a user process. You can set these values by placing the following entries in /etc/system. 9 Comments 1 Solution 8565 Views Last Modified: 6/1/2013. Solaris 11 kernel, ulimits and required packages. In older system we need to deal with ulimit command and most of the time we use to set in /etc/profile file to take effect for all users. # They are expected to edit it to meet their own needs. serialband. This document describes the various methods available in Solaris 10 and Solaris 11 for setting the … If you want to check the core file size limit then … On 64-bit Solaris 7, a 64-bit process has a default file descriptor set size (FD_SETSIZE) of 64Kbytes. If you wish to apply them permanently, you will have to edit the following file: # vi /etc/sysctl.conf Add the following line: fs.file-max=500000 After making this or any change in the /etc/system file, reboot Solaris for the new settings to take effect. It is not required to run NetBackup in a project on these operating systems but the following steps are what is required to set semaphore values on a Solaris 10 system: I have tried to change it with command. Reboot your machine and test the new limits configuration: # ulimit -a core file size (blocks, -c) 1 Use ulimit -a to check soft limits, and ulimit -Ha to check hard limits. Ex: List the existing “max user processes”. I'm not fully aware of HP-UX but know how change values and kernel parameter , if I can change it from /etc/profile. When editing you need to include these four elements: ## (Without this above condition, the default value for nofiles is half of the rlim_fd_cur) set rlim_fd_cur = 1024 # Soft limit on file descriptors for a single proc. Table 11-2 summarizes file descriptor limitations. If you do not set a sufficient value for the user data limit, fenced routines that run in fenced-mode processes might fail, including the autonomic computing daemon (db2acd). Set the new value to “max user processes” soft limit. hard limit (/etc/system parameter rlim_fd_max or the privileged level of resource control process.max-file-descriptor) These values will display as open files. set rlim_fd_max = 65536 When I tried to set it as "oracle" user, but getting this error: $ ulimit -n 65563 ksh: ulimit: exceeds allowable limit Also tried to set the setting in /home/user/.profile with no luck: $ more .profile # This is the default standard profile provided to a user. This command is equipped with many options and with this combination one can set number of open files. Check Process-Sizing Parameters section of Solaris Tunable Parameters Reference Manual for more. Resource controls can be observed on a system-wide basis and possible to update resource control values on a running system. Following are step-by-step commands with examples explained in detail. rlim_fd_max=8192. See the prctl(1) man page for more information.. How to Use the prctl Command to Display Default Resource Control Values. If you want to check real-time priority limit value then you need to use ulimit -r command as shown below. As you can see from below output, current real-time priority limit is set to 0. -r : real-time priority. Check ulimit command man page for more info. Option one: Share. Unix OS Linux. That setting will change back to whatever your ulimit is once the script exits, of course. semmsl - maximum number of semaphores that can be in one semaphore set. These limitations include how many files a process can have open, how large of a file the user can create, and how much memory can be used by the different components of the process such as the stack, data and text segments. But in Solaris 10, we can easily manage shell limits using simple prctl command. This file is used to apply ulimit created by the pam_module.. On Solaris systems, control this limit by setting rlim_fd_max and rlim_fd_cur in the /etc/system file. OLD = "combination of different kernel settings let to it or ulimit command (eg. The soft limit must be less than the hard limit. IF so, how do I check the limit and change it? To set to the given value: 3. Watch Question . This issue is definitely something that we plan to bring up with SAS support. As a final step, change the limits of the Oracle user-bash-4.4$ ulimit -a core file size (blocks, -c) unlimited data seg size (kbytes, -d) unlimited file size (blocks, -f) unlimited open files (-n) 65536 Should be equal to or greater than the value of oracle processes. As per above command output, soft limit can grow till 8192. 3/23/06 11:37 AM: Is there an /etc/system parameter that is equivalent to the value set by 'ulimit -s' (i.e., maximum size of stack segment) for Solaris 8/9? [code language=”css”] set. passwd oracle. Set the core file path and name pattern. How about displaying the individual parameters? Use the prctl command to make runtime interrogations of and modifications to the resource controls associated with an active process, task, or project on the system. can we set ulimit value for each userID in solaris? Below are a few examples of how TCP parameters can be set permanently in Solaris 11: 1. Code: You can check the current value for opened files with the following command: $ cat /proc/sys/fs/file-max With the above command the changes you have made will only remain active until the next reboot. To check the value of max “core file size”, by adding something like the following to the system-wide /etc/profileor the specific application user's profile Ex: #!/bin/ksh. The "Solaris Tunable Parameters Reference Manual" references both 'lwp_default_stksize' and 'rpcmod:svc_default_stksize'. I went through many discusstion here but still cannot find how can this be done. Current value of ulimit -n is 2048. 5. created at any one time. Our community of experts have been thoroughly vetted for their expertise and industry experience. From the package { ['shell/ksh', 'developer/assembler']: ensure => present, } $install = "pkg:/group/prerequisite/oracle/oracle-rdbms-server-12-1-preinstall" package { $install: ensure => present, } $groups = ['oinstall','dba' ,'oper' ] group { $groups : ensure => present, } user { 'oracle' : ensure => present, uid => 500, gid => 'dba', groups => $groups, shell => '/bin/bash', … Option two: You are logged in as user and in some "config" file (profile, bashrc, something like this) the soft limit is set to a lower value. Possible solution f.e. grep for ulimit in your etc folder and/or home folder. ps: there are a lot of similiar question here you might want to read up. There is a bug in Debian. Comment. SID_C = has the largest value. change ulimit permanently on hp-ux 11.31. Note: Processes that run on UNIX operating systems inherit the ulimit value from the user ID that started the process. The hard limit can be set by the system administrator and be decreased by any user, whereas the soft limit can be set by any user, up to the hard limit. The current setting are: Code: root@xxxxx: (wmdev)> ulimit -a time (seconds) unlimited file (blocks) unlimited data (kbytes) 1048576 stack (kbytes) 131072 memory (kbytes) unlimited coredump (blocks) 4194303 nofiles (descriptors) 4096 root@xxxxx: (wmdev)>. Restart the server and now the limit is set for all users: [nglinux@nglinux ~]$ ulimit -a core file size (blocks, -c) 102400 data seg size (kbytes, -d) unlimited 5. You can look at your limit as we did above with the ulimit -a command or show just the "nproc" limit with the command ulimit -u. set rlim_fd_max = 4096 # Hard limit on file descriptors for a single proc. $ ulimit … and... This will require a reboot. To set to the given value: 2. Solaris 10 uses projects to set these values. I need to change it to 65536 or unlimited as required on from Oracle . The following steps check for the existence of a NetBackup project, and allow you to tune semaphore values within the project. prctl -n project.max-shm-memory -i project group.dba prctl -n project.max-sem-ids -i project group.dba prctl -n project.max-shm-ids -i project group.dba prctl -n process.max-sem-nsems -i process $$ Run command “cat /etc/project” to check the entries in /etc/project > These are the ulimit parameters to be set for Solaris machine for oracle. Especially for non-root installations, the data, nofile, and fsize ulimit values should be set appropriately by an administrator after installing. To set ulimit value on a parameter use the below command. For the ulimits to persists across reboots we need to set the ulimit values in the configuration file /etc/security/limits.conf. Settings in /etc/security/limits.conf take the following form: test with ulimit... The file has the following syntax: Here we will stop to discuss each of the options: Domain – this includes usernames, groups, guid ranges etc; Type – soft and hard limits; Item – the item that will be limited – core size, file size, nproc etc; Value – this is the value for the given limit Set stack size to 128 MB : ulimit -S -s 131072: limit stacksize 128m . The ulimit option used for this is -u. How do you make the ulimit values permanent for a user? Please use /etc/security/limits.d/90-nproc.conf instead. - you can configure ulimits for … semmni - the number of semaphore set identifiers that can be. How to check the core file size limit in Linux/Unix. My login user is a normal user, not root. In our example we will set the maximum number of files to 16384 for all users of the system (values can be set for individual users or groups as well): # vi /etc/security/limits.conf. -S – soft limit. Use the following command command to display maximum number of open file descriptors: ASKER CERTIFIED SOLUTION. : lwp_default_stksize, rlim_fd_cur)" Oracle RDBMS Installation Minimum Value = soft 10240 / hard 32768 Solaris 10 Default = 8192 Solaris 11.4 Default = 8192 OSC Setting = 33554432. Reference: ulimit -n 2048 # set the number of open files. If you want to make any permanent changes to the ulimits of any user, you will have to make changes to the security file as root. The following table shows the default and maximum values for the soft The recommended values are not less than: ulimit (TIME) = unlimited ulimit (FILE) = unlimited ulimit (DATA) = 1048576 Soft ulimit (NOFILES) = 1024 Hard ulimit (NOFILES) = 65536 ulimit (VMEMORY) = 4194304 and not more than Soft ulimit (STACK) = 10240 Hard ulimit (STACK) = 32768 VmemoryNotDefined StackHardUnlimited Review the ulimit settings: Set the hard ulimit (STACK) to a maximum of 32768 ulimit … To set tcp_naglim_def = 1. More details can be found from below command: # man limits.conf Note that the nproc setting can no longer be set in limits.conf. Then we need to set the password of the oracle user. Using the prctl Command. ### You have to define this in /etc/sysctl.conf for changing the core file path permanently. In my case of Apache on Debian 10 the above didn't help though this worked: echo "APACHE_ULIMIT_MAX_FILES='ulimit -n 16384'" >> /etc/apache2/envvar... Then call “ulimit” with the respective parameters. by default, the root login has the following ulimits: # ulimit -a time(seconds) unlimited file(blocks) unlimited data(kbytes) unlimited stack(kbytes) 8192 coredump(blocks) unlimited nofiles(descriptors) 1024 memory(kbytes) unlimited I set the nofiles to a larger value: # ulimit -n 2048 # ulimit -a time(seconds) unlimited file(blocks) unlimited data(kbytes) unlimited stack(kbytes) 8192 coredump(blocks) unlimited … Then the maximum number of processes on the system will be derived from the maxusers. This was on a 64-bit quad-core 64GB memory Solaris server. You did not set the softlimit higher aswell. Possible solution: in /etc/security/limits.conf add * soft nofile 2048 As I mentioned in the beginning of the article, ulimit is governed by /etc/security/limits.conf. set maxuprc = Alternatively increase maxusers from the current value by setting set maxusers = in /etc/system. ulimit is the command used to accomplish this. I did the following operation: file /etc/sysctl.conf $ grep 'fs.file-max' /etc/ You must have a sufficient data limit for all users with SYSADMIN authority and the database instance ID. There is a bug in Debian. To increase ulimit you need to add this into the /etc/pam.d/common-session file: session required pam_limits.so Farmland Information Center, Utility Crossword Clue, Best Whatsapp Stickers, Coin Slots In Vegas 2021, Lafayette 148 Murray Pant, Acadia Parish 2021 2022 School Calendar,

For Solaris 11, the default for rlim_fd_max is 65536 and the default value for rlim_fd_cur is 256. To just set the ulimit - you can also just put that in your script. I wanna change system open files setting permanently, but it doesn't work. CHECK per process That could be logged by: nice - max nice priority allowed to raise to values: [-20, 19] rtprio - max realtime priority; Exit and re-login from the terminal for the change to take effect. SERVER:/etc # grep -RiI 'MAX_OPEN_FDS' * 2>/dev/null init.d/boot.multipath:MAX_OPEN_FDS=4096 init.d/boot.multipath: if [ -n "$MAX_OPEN_FDS" ] ; then init.d/boot.multipath: ulimit -n $MAX_OPEN_FDS init.d/multipathd:MAX_OPEN_FDS=4096 init.d/multipathd: if [ -n "$MAX_OPEN_FDS" ] ; then init.d/multipathd: ulimit -n $MAX_OPEN_FDS rc.d/boot.multipath:MAX_OPEN_FDS=4096 rc.d/boot.multipath: if [ -n "$MAX_OPEN_FDS" ] ; then rc.d/boot.multipath: ulimit … With any shell, you can always reset both soft and hard limits to their default values by logging out and back in. Note: Not all of these commands will work as not every system incorporates the features. Add two lines for each limit: * soft nofile 16384 * hard nofile 16384. To set tcp_recv_hiwat =1048576 and tcp_xmit_hiwat = 1048576. [oracle@mylinz ~]$ ulimit -S -u 4096 [oracle@mylinz ~]$ ulimit -H -u 8192 [oracle@mylinz ~]$. This is the default on Solaris: As you see, all default values are higher than the required values except for the open file descriptors. I am not sure whether the stack hard limit should be reduced. -H – Hard limit. On AIX: etc/security/limits. To set tcp_conn_req_max_q = 1024 and tcp_conn_req_max_q0 = 2048. On the Cray XT, both RLIMIT_CORE and RLIMIT_CPU limits are always forwarded to the compute nodes. We stopped all the SAS processes and set the ulimit to 2048 (10% of recommended) and was able to successfully bring up the SAS services via the sas.servers script. Luckily, we have “ulimit” command in any of the Linux based server, by which one can see/set/get number of files open status/configuration details. where: SID_A,SID_B,SID_C = processes value per instance. UNIX/Linux operating systems have the ability to limit the amount of various system resources available to a user process. You can set these values by placing the following entries in /etc/system. 9 Comments 1 Solution 8565 Views Last Modified: 6/1/2013. Solaris 11 kernel, ulimits and required packages. In older system we need to deal with ulimit command and most of the time we use to set in /etc/profile file to take effect for all users. # They are expected to edit it to meet their own needs. serialband. This document describes the various methods available in Solaris 10 and Solaris 11 for setting the … If you want to check the core file size limit then … On 64-bit Solaris 7, a 64-bit process has a default file descriptor set size (FD_SETSIZE) of 64Kbytes. If you wish to apply them permanently, you will have to edit the following file: # vi /etc/sysctl.conf Add the following line: fs.file-max=500000 After making this or any change in the /etc/system file, reboot Solaris for the new settings to take effect. It is not required to run NetBackup in a project on these operating systems but the following steps are what is required to set semaphore values on a Solaris 10 system: I have tried to change it with command. Reboot your machine and test the new limits configuration: # ulimit -a core file size (blocks, -c) 1 Use ulimit -a to check soft limits, and ulimit -Ha to check hard limits. Ex: List the existing “max user processes”. I'm not fully aware of HP-UX but know how change values and kernel parameter , if I can change it from /etc/profile. When editing you need to include these four elements: ## (Without this above condition, the default value for nofiles is half of the rlim_fd_cur) set rlim_fd_cur = 1024 # Soft limit on file descriptors for a single proc. Table 11-2 summarizes file descriptor limitations. If you do not set a sufficient value for the user data limit, fenced routines that run in fenced-mode processes might fail, including the autonomic computing daemon (db2acd). Set the new value to “max user processes” soft limit. hard limit (/etc/system parameter rlim_fd_max or the privileged level of resource control process.max-file-descriptor) These values will display as open files. set rlim_fd_max = 65536 When I tried to set it as "oracle" user, but getting this error: $ ulimit -n 65563 ksh: ulimit: exceeds allowable limit Also tried to set the setting in /home/user/.profile with no luck: $ more .profile # This is the default standard profile provided to a user. This command is equipped with many options and with this combination one can set number of open files. Check Process-Sizing Parameters section of Solaris Tunable Parameters Reference Manual for more. Resource controls can be observed on a system-wide basis and possible to update resource control values on a running system. Following are step-by-step commands with examples explained in detail. rlim_fd_max=8192. See the prctl(1) man page for more information.. How to Use the prctl Command to Display Default Resource Control Values. If you want to check real-time priority limit value then you need to use ulimit -r command as shown below. As you can see from below output, current real-time priority limit is set to 0. -r : real-time priority. Check ulimit command man page for more info. Option one: Share. Unix OS Linux. That setting will change back to whatever your ulimit is once the script exits, of course. semmsl - maximum number of semaphores that can be in one semaphore set. These limitations include how many files a process can have open, how large of a file the user can create, and how much memory can be used by the different components of the process such as the stack, data and text segments. But in Solaris 10, we can easily manage shell limits using simple prctl command. This file is used to apply ulimit created by the pam_module.. On Solaris systems, control this limit by setting rlim_fd_max and rlim_fd_cur in the /etc/system file. OLD = "combination of different kernel settings let to it or ulimit command (eg. The soft limit must be less than the hard limit. IF so, how do I check the limit and change it? To set to the given value: 3. Watch Question . This issue is definitely something that we plan to bring up with SAS support. As a final step, change the limits of the Oracle user-bash-4.4$ ulimit -a core file size (blocks, -c) unlimited data seg size (kbytes, -d) unlimited file size (blocks, -f) unlimited open files (-n) 65536 Should be equal to or greater than the value of oracle processes. As per above command output, soft limit can grow till 8192. 3/23/06 11:37 AM: Is there an /etc/system parameter that is equivalent to the value set by 'ulimit -s' (i.e., maximum size of stack segment) for Solaris 8/9? [code language=”css”] set. passwd oracle. Set the core file path and name pattern. How about displaying the individual parameters? Use the prctl command to make runtime interrogations of and modifications to the resource controls associated with an active process, task, or project on the system. can we set ulimit value for each userID in solaris? Below are a few examples of how TCP parameters can be set permanently in Solaris 11: 1. Code: You can check the current value for opened files with the following command: $ cat /proc/sys/fs/file-max With the above command the changes you have made will only remain active until the next reboot. To check the value of max “core file size”, by adding something like the following to the system-wide /etc/profileor the specific application user's profile Ex: #!/bin/ksh. The "Solaris Tunable Parameters Reference Manual" references both 'lwp_default_stksize' and 'rpcmod:svc_default_stksize'. I went through many discusstion here but still cannot find how can this be done. Current value of ulimit -n is 2048. 5. created at any one time. Our community of experts have been thoroughly vetted for their expertise and industry experience. From the package { ['shell/ksh', 'developer/assembler']: ensure => present, } $install = "pkg:/group/prerequisite/oracle/oracle-rdbms-server-12-1-preinstall" package { $install: ensure => present, } $groups = ['oinstall','dba' ,'oper' ] group { $groups : ensure => present, } user { 'oracle' : ensure => present, uid => 500, gid => 'dba', groups => $groups, shell => '/bin/bash', … Option two: You are logged in as user and in some "config" file (profile, bashrc, something like this) the soft limit is set to a lower value. Possible solution f.e. grep for ulimit in your etc folder and/or home folder. ps: there are a lot of similiar question here you might want to read up. There is a bug in Debian. Comment. SID_C = has the largest value. change ulimit permanently on hp-ux 11.31. Note: Processes that run on UNIX operating systems inherit the ulimit value from the user ID that started the process. The hard limit can be set by the system administrator and be decreased by any user, whereas the soft limit can be set by any user, up to the hard limit. The current setting are: Code: root@xxxxx: (wmdev)> ulimit -a time (seconds) unlimited file (blocks) unlimited data (kbytes) 1048576 stack (kbytes) 131072 memory (kbytes) unlimited coredump (blocks) 4194303 nofiles (descriptors) 4096 root@xxxxx: (wmdev)>. Restart the server and now the limit is set for all users: [nglinux@nglinux ~]$ ulimit -a core file size (blocks, -c) 102400 data seg size (kbytes, -d) unlimited 5. You can look at your limit as we did above with the ulimit -a command or show just the "nproc" limit with the command ulimit -u. set rlim_fd_max = 4096 # Hard limit on file descriptors for a single proc. $ ulimit … and... This will require a reboot. To set to the given value: 2. Solaris 10 uses projects to set these values. I need to change it to 65536 or unlimited as required on from Oracle . The following steps check for the existence of a NetBackup project, and allow you to tune semaphore values within the project. prctl -n project.max-shm-memory -i project group.dba prctl -n project.max-sem-ids -i project group.dba prctl -n project.max-shm-ids -i project group.dba prctl -n process.max-sem-nsems -i process $$ Run command “cat /etc/project” to check the entries in /etc/project > These are the ulimit parameters to be set for Solaris machine for oracle. Especially for non-root installations, the data, nofile, and fsize ulimit values should be set appropriately by an administrator after installing. To set ulimit value on a parameter use the below command. For the ulimits to persists across reboots we need to set the ulimit values in the configuration file /etc/security/limits.conf. Settings in /etc/security/limits.conf take the following form: test with ulimit... The file has the following syntax: Here we will stop to discuss each of the options: Domain – this includes usernames, groups, guid ranges etc; Type – soft and hard limits; Item – the item that will be limited – core size, file size, nproc etc; Value – this is the value for the given limit Set stack size to 128 MB : ulimit -S -s 131072: limit stacksize 128m . The ulimit option used for this is -u. How do you make the ulimit values permanent for a user? Please use /etc/security/limits.d/90-nproc.conf instead. - you can configure ulimits for … semmni - the number of semaphore set identifiers that can be. How to check the core file size limit in Linux/Unix. My login user is a normal user, not root. In our example we will set the maximum number of files to 16384 for all users of the system (values can be set for individual users or groups as well): # vi /etc/security/limits.conf. -S – soft limit. Use the following command command to display maximum number of open file descriptors: ASKER CERTIFIED SOLUTION. : lwp_default_stksize, rlim_fd_cur)" Oracle RDBMS Installation Minimum Value = soft 10240 / hard 32768 Solaris 10 Default = 8192 Solaris 11.4 Default = 8192 OSC Setting = 33554432. Reference: ulimit -n 2048 # set the number of open files. If you want to make any permanent changes to the ulimits of any user, you will have to make changes to the security file as root. The following table shows the default and maximum values for the soft The recommended values are not less than: ulimit (TIME) = unlimited ulimit (FILE) = unlimited ulimit (DATA) = 1048576 Soft ulimit (NOFILES) = 1024 Hard ulimit (NOFILES) = 65536 ulimit (VMEMORY) = 4194304 and not more than Soft ulimit (STACK) = 10240 Hard ulimit (STACK) = 32768 VmemoryNotDefined StackHardUnlimited Review the ulimit settings: Set the hard ulimit (STACK) to a maximum of 32768 ulimit … To set tcp_naglim_def = 1. More details can be found from below command: # man limits.conf Note that the nproc setting can no longer be set in limits.conf. Then we need to set the password of the oracle user. Using the prctl Command. ### You have to define this in /etc/sysctl.conf for changing the core file path permanently. In my case of Apache on Debian 10 the above didn't help though this worked: echo "APACHE_ULIMIT_MAX_FILES='ulimit -n 16384'" >> /etc/apache2/envvar... Then call “ulimit” with the respective parameters. by default, the root login has the following ulimits: # ulimit -a time(seconds) unlimited file(blocks) unlimited data(kbytes) unlimited stack(kbytes) 8192 coredump(blocks) unlimited nofiles(descriptors) 1024 memory(kbytes) unlimited I set the nofiles to a larger value: # ulimit -n 2048 # ulimit -a time(seconds) unlimited file(blocks) unlimited data(kbytes) unlimited stack(kbytes) 8192 coredump(blocks) unlimited … Then the maximum number of processes on the system will be derived from the maxusers. This was on a 64-bit quad-core 64GB memory Solaris server. You did not set the softlimit higher aswell. Possible solution: in /etc/security/limits.conf add * soft nofile 2048 As I mentioned in the beginning of the article, ulimit is governed by /etc/security/limits.conf. set maxuprc = Alternatively increase maxusers from the current value by setting set maxusers = in /etc/system. ulimit is the command used to accomplish this. I did the following operation: file /etc/sysctl.conf $ grep 'fs.file-max' /etc/ You must have a sufficient data limit for all users with SYSADMIN authority and the database instance ID. There is a bug in Debian. To increase ulimit you need to add this into the /etc/pam.d/common-session file: session required pam_limits.so

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