#ftp hard nproc 0
#@student - maxlogins 4
# End of file
* soft nproc 16384
* hard nproc 65536
* soft nofile 16384
* hard nofile 65536
oracle soft memlock 120795955
oracle hard memlock 120795955
[oracle@SMW-DB-134 ~]$ more /etc/security/limits.d/oracle-database-preinstall-19c.conf
oracle-database-preinstall-19c setting for nofile soft limit is 1024
#oracle soft nofile 1024oracle soft nofile 65536
oracle-database-preinstall-19c setting for nofile hard limit is 65536
oracle hard nofile 65536
oracle-database-preinstall-19c setting for nproc soft limit is 16384
refer orabug15971421 for more info.
oracle soft nproc 16384
oracle-database-preinstall-19c setting for nproc hard limit is 16384
oracle hard nproc 16384
oracle-database-preinstall-19c setting for stack soft limit is 10240KB
oracle soft stack 10240
oracle-database-preinstall-19c setting for stack hard limit is 32768KB
oracle hard stack 32768
oracle-database-preinstall-19c setting for memlock hard limit is maximum of 128GB on x86_64 or 3GB on x86 OR 90 % of RAM
#oracle hard memlock 134217728oracle hard memlock 120795955
oracle-database-preinstall-19c setting for memlock soft limit is maximum of 128GB on x86_64 or 3GB on x86 OR 90% of RAM
#oracle soft memlock 134217728oracle soft memlock 120795955
oracle-database-preinstall-19c setting for data soft limit is 'unlimited'
oracle soft data unlimited
oracle-database-preinstall-19c setting for data hard limit is 'unlimited'
oracle hard data unlimited
1.VẤN ĐỀ
SQL> startup
ORA-27106: system pages not available to allocate memory
Additional information: 6048
Additional information: 1
[oracle\@SMW-DB-134 \~]$ more /etc/sysctl.conf
# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
# oracle-database-preinstall-19c setting for fs.file-max is 6815744
fs.file-max = 6815744
# oracle-database-preinstall-19c setting for kernel.sem is '250 32000 100 128'
kernel.sem = 250 32000 100 128
# oracle-database-preinstall-19c setting for kernel.shmmni is 4096
kernel.shmmni = 4096
# oracle-database-preinstall-19c setting for kernel.shmall is 1073741824 on x86\_64
\#kernel.shmall = 1073741824
kernel.shmall = 29904077
# oracle-database-preinstall-19c setting for kernel.shmmax is 4398046511104 on x86\_64
\#kernel.shmmax = 4398046511104
kernel.shmmax = 122487098573
# oracle-database-preinstall-19c setting for kernel.panic\_on\_oops is 1 per Orabug 19212317
kernel.panic\_on\_oops = 1
# oracle-database-preinstall-19c setting for net.core.rmem\_default is 262144
net.core.rmem\_default = 262144
# oracle-database-preinstall-19c setting for net.core.rmem\_max is 4194304
net.core.rmem\_max = 2096304
# oracle-database-preinstall-19c setting for net.core.wmem\_default is 262144
net.core.wmem\_default = 262144
# oracle-database-preinstall-19c setting for net.core.wmem\_max is 1048576
net.core.wmem\_max = 2096304
# oracle-database-preinstall-19c setting for net.ipv4.conf.all.rp\_filter is 2
net.ipv4.conf.all.rp\_filter = 2
# oracle-database-preinstall-19c setting for net.ipv4.conf.default.rp\_filter is 2
net.ipv4.conf.default.rp\_filter = 2
# oracle-database-preinstall-19c setting for fs.aio-max-nr is 1048576
fs.aio-max-nr = 1048576
# oracle-database-preinstall-19c setting for net.ipv4.ip\_local\_port\_range is 9000 65500
net.ipv4.ip\_local\_port\_range = 9000 65500
\#vm.dirty\_background\_ratio = 5
\#vm.dirty\_ratio = 10
vm.swappiness=0
vm.nr\_hugepages = 36874
[oracle\@SMW-DB-134 \~]$ more /etc/security/limits.conf 
\# /etc/security/limits.conf
\#
\#This file sets the resource limits for the users logged in via PAM.
\#It does not affect resource limits of the system services.
\#
\#Also note that configuration files in /etc/security/limits.d directory,
\#which are read in alphabetical order, override the settings in this
\#file in case the domain is the same or more specific.
\#That means for example that setting a limit for wildcard domain here
\#can be overriden with a wildcard setting in a config file in the
\#subdirectory, but a user specific setting here can be overriden only
\#with a user specific setting in the subdirectory.
\#
\#Each line describes a limit for a user in the form:
\#
\#\<domain> \<type> \<item> \<value>
\#
\#Where:
\#\<domain> can be:
\# - a user name
\# - a group name, with @group syntax
\# - the wildcard \*, for default entry
\# - the wildcard %, can be also used with %group syntax,
\# for maxlogin limit
\#
\#\<type> can have the two values:
\# - "soft" for enforcing the soft limits
\# - "hard" for enforcing hard limits
\#
\#\<item> can be one of the following:
\# - core - limits the core file size (KB)
\# - data - max data size (KB)
\# - fsize - maximum filesize (KB)
\# - memlock - max locked-in-memory address space (KB)
\# - nofile - max number of open file descriptors
\# - rss - max resident set size (KB)
\# - stack - max stack size (KB)
\# - cpu - max CPU time (MIN)
\# - nproc - max number of processes
\# - as - address space limit (KB)
\# - maxlogins - max number of logins for this user
\# - maxsyslogins - max number of logins on the system
\# - priority - the priority to run user process with
\# - locks - max number of file locks the user can hold
\# - sigpending - max number of pending signals
\# - msgqueue - max memory used by POSIX message queues (bytes)
\# - nice - max nice priority allowed to raise to values: [-20, 19]
\# - rtprio - max realtime priority
\#
\#\<domain> \<type> \<item> \<value>
\#
\#\* soft core 0
\#\* hard rss 10000
\#@student hard nproc 20
\#@faculty soft nproc 20
\#@faculty hard nproc 50
\#ftp hard nproc 0
\#@student - maxlogins 4
\# End of file
\* soft nproc 16384
\* hard nproc 65536
\* soft nofile 16384
\* hard nofile 65536
oracle soft memlock 120795955
oracle hard memlock 120795955
[oracle\@SMW-DB-134 \~]$ more /etc/security/limits.d/oracle-database-preinstall-19c.conf
# oracle-database-preinstall-19c setting for nofile soft limit is 1024
\#oracle soft nofile 1024
oracle soft nofile 65536
# oracle-database-preinstall-19c setting for nofile hard limit is 65536
oracle hard nofile 65536
# oracle-database-preinstall-19c setting for nproc soft limit is 16384
# refer orabug15971421 for more info.
oracle soft nproc 16384
# oracle-database-preinstall-19c setting for nproc hard limit is 16384
oracle hard nproc 16384
# oracle-database-preinstall-19c setting for stack soft limit is 10240KB
oracle soft stack 10240
# oracle-database-preinstall-19c setting for stack hard limit is 32768KB
oracle hard stack 32768
# oracle-database-preinstall-19c setting for memlock hard limit is maximum of 128GB on x86\_64 or 3GB on x86 OR 90 % of RAM
\#oracle hard memlock 134217728
oracle hard memlock 120795955
# oracle-database-preinstall-19c setting for memlock soft limit is maximum of 128GB on x86\_64 or 3GB on x86 OR 90% of RAM
\#oracle soft memlock 134217728
oracle soft memlock 120795955
# oracle-database-preinstall-19c setting for data soft limit is 'unlimited'
oracle soft data unlimited
# oracle-database-preinstall-19c setting for data hard limit is 'unlimited'
oracle hard data unlimited
2.NGUYÊN NHÂN
Các số của anh rất giống:
RAM = 128GB SGA = 72GB vm.nr_hugepages = 36874
Vì:
72 × 1024 / 2 = 36864 pages
và anh đặt:
36874
tức chỉ cộng thêm 10 page.
Nếu alert log báo Oracle cần nhiều hơn, startup sẽ fail nếu:
USE_LARGE_PAGES=ONLY
Oracle 19c nói rõ: với ONLY, instance sẽ không startup nếu toàn bộ SGA không thể dùng Large Pages.
Đây là cơ chế tốt cho production nhưng buộc HugePages phải đủ chính xác.
3.GIẢI PHÁP
Thăng thêm 100 hugepage (100*2=200MB):
vm.nr_hugepages = 36964
Bật lại DB
SQL > startupTƯ VẤN: Click Here hoặc Hotline/Zalo 090.29.12.888
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