*Don't forget to logout and login to verify your configuration applied. Also application restart should be a safe way.
Information:
#ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 20 file size (blocks, -f) unlimited pending signals (-i) 16382 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited file locks (-x) unlimited
Ulimit options that are supported by every shell I've seen:
-H: Combine with other options to set or show the hard limit only.-S: Combine with other options to set or show the soft limit only.-c: maximum core file size (512-byte blocks)-d: maximum heap (data segment) size (kB)-f: maximum file size (512-byte blocks)-n: maximum number of file descriptors-s: maximum stack size (kB)-t: maximum CPU time (s)
A few other very common options:
-a: Display all limits.-m: maximum physical memory size (kB)-v: maximum virtual memory size (kB)
OS Examples;
- Redhat|config
# vi /etc/security/limits.conf oracle soft nofile 65536 oracle hard nofile 65536[/shell] Only Edit limits.conf file is enough for soft and hard open files limit but in some case you should add this to profile. ulimit –n 65536 Max. file parameter can be defined with this formula. for 8GB ram capacity; 8gb= 8192 mb 8192/4= 2048 2048*256=524288 [shell]# sysctl -w fs.file-max= 524288[/shell] and permananet; [shell]# cat /etc/sysctl.conf[/shell] fs.file-max = 524288 [shell]# sysctl –p
- Redhat|monitoring
#ulimit -a[ #ulimit -a -H // hard limit.
- Solaris|config
]#vi /etc/system set rlim_fd_max = 4096 #hard set rlim_fd_cur = 1024 #soft
For oracle database maybe you need to set project to define limit. This is a well-known method to specify limit parameters for oracle user.
# projadd -U oracle -K "process.max-file-descriptor=(priv,4096,deny)" user.oracle # echo 'rlim_fd_max/D' | mdb -k # echo 'rlim_fd_cur/D' | mdb -k
- Solaris|monitoring
# ulimit -Ha //hard # ulimit -Sa // soft # ulimit -n / open files
- HP-UX|config
For HP-UX ,also you need to check and verify kernel parameters. You need to use kctune to configure kernel parameter which belongs to your limit options.
#kctune -v maxfiles #vi /home/user/.profile veya /etc/profile ulimit -n 4096
- HP-UX|monitoring
# ulimit -Ha //hard # ulimit -Sa // soft # ulimit -n / open files
