Ora 27125 unable to create shared memory segment linux

Ora 27125 unable to create shared memory segment linux

Start oracle error on the linux server:

SQL>startup; ORA-27125:unable to create shared memory segment Linux-x86_64 Error: 1:Operation not permitted SQL> 

The online query error message is related to the file /proc/sys/vm/hugetlb_shm_group;
Query the oracle user id, add uid to the file

[[email protected] ~]id oracle uid=500(oracle) gid=500(dba) groups=500(dba) [[email protected] ~]echo 500 > /proc/sys/vm/hugetlb_shm_group 

[[email protected] ~]sqlplus / as sysdba SQL*Plus: Release 10.2.0.1.0 - Production on Friday March 15 12:47:14 2019 Copyright (c) 1982, 2005, Oracle. All rights reserved. Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production With the Partitioning, OLAP and Data Mining iptions SQL>startup; ORACKE instance started. Total System Global Area 1224736768 bytes Fixed Size 2020384 bytes Variable Size 31870144 bytes Database Buffers 889192448 bytes Redi Buffers 14753792 bytes Database mounted. Database opened. SQL> 

The startup was successful.

PS: Sometimes the above situation occurs after restarting the database, then add the following content to the /etc/sysctl.conf file: vm.hugetlb_shm_group = 500

Источник

Instance start up reports ORA-27125: unable to create shared memory segment (Doc ID 1970546.1)

The host ran out of disk space and ASM and the RDBMS were unable to create audit files.

The environment was shutdown to correct this.

After freeing up space the ASM instance is unable to start reporting the following errors

.
Starting ORACLE instance (normal)
Thu Feb 12 16:09:45 2015
MEMORY_TARGET defaulting to 1128267776.
* instance_number obtained from CSS = 1, checking for the existence of node 0.
* node 0 does not exist. instance_number = 1
Starting ORACLE instance (normal)
.

SQL*Plus: Release 11.2.0.4.0 Production on Thu Feb 12 16:09:43 2015

Copyright (c) 1982, 2013, Oracle. All rights reserved.

Connected to an idle instance.

SQL> startup
ORA-27125: unable to create shared memory segment
Linux-x86_64 Error: 13: Permission denied
Additional information: 8388608
Additional information: 1

Cause

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Ora 27125 unable to create shared memory segment linux

Building a single Oracle10G on CentOS6, starting after the completion of the shutdown, the error message is as follows:

[[email protected] ~]# su - oracle [[email protected] ~]$ sqlplus / as sysdba SQL> startup; ORA-27125: unable to create shared memory segment Linux-x86_64 Error: 1: Operation not permitted SQL> Disconnected 

ORA-27125: unable to create shared memory segment
Linux-x86_64 Error: 1: Operation not permitted

Database version: Release 10.2.0.1.0

analysis:

The root source is that Linux errors, the system is not allowed by issues such as permission, so the database cannot create a shared memory segment. You need to use hugepage when you create a shared memory segment, and the system will perform permission restrictions.

Solution:

temporary plan: Query the group ID of the DBA group, add it to the system kernel, as follows:

[[email protected] ~]$ id oracle uid=500(oracle) gid=500(oinstall) groups=500(oinstall),501(dba) # Switch to root users to add [[email protected] ~]# echo 501 > /proc/sys/vm/hugetlb_shm_group 

[[email protected] ~]# su - oracle [[email protected] ~]$ sqlplus / as sysdba SQL> startup; ORACLE instance started. Total System Global Area 595591168 bytes Fixed Size 2022568 bytes Variable Size 180355928 bytes Database Buffers 406847488 bytes Redo Buffers 6365184 bytes Database mounted. Database opened. 

Temporary program, the method of failing after the system is restarted, the permanent change is as follows

Permanent programModify the kernel parameter file

[[email protected] ~]# echo "vm.hugetlb_shm_group = 501" >> /etc/sysctl.conf [[email protected] ~]# sysctl -p net.ipv4.ip_forward = 0 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.default.accept_source_route = 0 kernel.sysrq = 0 kernel.core_uses_pid = 1 net.ipv4.tcp_syncookies = 1 kernel.msgmnb = 65536 kernel.msgmax = 65536 kernel.shmmax = 68719476736 kernel.shmall = 4294967296 kernel.shmall = 2097152 kernel.shmmax = 2147483648 kernel.shmmni = 4096 kernel.sem = 250 32000 100 128 net.ipv4.ip_local_port_range = 1024 65000 net.core.rmem_default = 4194304 net.core.rmem_max = 4194304 net.core.wmem_default = 262144 net.core.wmem_max = 262144 vm.hugetlb_shm_group = 501 

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How to Resolve ORA-27125: unable to create shared memory segment

We found error ORA-27125 when we create the second database by Database Configuration Assistant (DBCA).

ORA-27125 means that oracle has been bound to the limit of maximum shared memory in UNIX server, you should check the maximum shared memory, then raise it.

Solutions

There’re 3 ways to solve this error.

Increase Shard Memory

To increase the shared memory limit ( max-shm-memory ) in Solaris, you may do this:

root@test:~# projmod -sK «project.max-shm-memory=(privileged,20GB,deny)» user.oracle

In this case, we raised the limit of maximum shared memory to 20GB. Let’s see the result.

root@test:~# projects -l user.oracle
user.oracle
projid : 100
comment: «Oracle Products»
users : (none)
groups : (none)
attribs: process.max-sem-nsems=(privileged,256,deny)
project.max-sem-ids=(privileged,256,deny)
project.max-shm-ids=(privileged,256,deny)
project.max-shm-memory=(privileged, 21474836480 ,deny)

Shutdown Unnecessary Processes

If the physical memory is very tight and you don’t want to raise the shared memory, then all you can do is to close unnecessary oracle processes. Furthermore, you can shutdown other databases before starting this one.

System Reboot

Sometimes, we might have already configured the shared memory far enough for Oracle to create or startup another database. In such case, a system reboot is necessary to flush something cached in the system.

For more about project creation, you may check the post: How to Install Oracle Database 19c on Solaris.

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Java Solutions

You got the below error when starting up the Oracle database.

ORA-27125: unable to create shared memory segment

Linux-x86_64 Error: 28: No space left on device

Additional information: 3760

Additional information: 4278190080

This occurs when the Kernel parameter kernel.shmall is too small.

Follow the steps below to fix the problem.

1. Determine the page size.

2. Determine the Total System Global Area (SGA).

Total System Global Area 6442450944 bytes

Variable Size 3892316248 bytes

Database Buffers 2533359616 bytes

Redo Buffers 13836288 bytes

3. Calculate the recommended value for shmall.

With SGA = 6 GB and PAGE_SIZE = 4096, the shmall is

shmall = 6 * 1024 * 1024 * 1024 / 4096 = 1572864

4. Update the kernel.shmall parameter.

Login the Linux machine as root.

Scroll down to find kernel.shmall and change it’s value to 1572864.

* If you could not find the SGA at step 2, you may try to double the current value of shmall.

7. Login to the Oracle database as sysdba and start the database.

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