당신은 주제를 찾고 있습니까 “ora 00845 memory_target not supported on this system – ORA 00845 – Memory_target not supported“? 다음 카테고리의 웹사이트 https://ppa.charoenmotorcycles.com 에서 귀하의 모든 질문에 답변해 드립니다: ppa.charoenmotorcycles.com/blog. 바로 아래에서 답을 찾을 수 있습니다. 작성자 STAXALPHA 이(가) 작성한 기사에는 조회수 812회 및 좋아요 6개 개의 좋아요가 있습니다.
Cause: The MEMORY_TARGET parameter was not supported on this operating system or /dev/shm was not sized correctly on Linux. Action: Refer to documentation for a list of supported operating systems. Or, size /dev/shm to be at least the SGA_MAX_SIZE on each Oracle instance running on the system.There are two possible ways to remove the ORA-00845 error. Reduce the value for the memory_target parameter Or Increase the temporary memory allocation on the server. I will increase the Shared Memory file system (shmfs). For this I will mount with increased space for tmps.This ORA-27102 errors are related with the Out of memory. SHMALL is the total amount of shared memory, in pages, that the system can use at one time. To solve this error, Set SHMALL equal to the sum of all the SGAs on the system, divided by the page size.
- Start SQL*Plus and connect to the database as SYSDBA .
- Calculate the minimum value for MEMORY_TARGET as follows: …
- Choose the value for MEMORY_TARGET that you want to use.
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MEMORY_TARGET not supported on this system” trên Oracle
Fix lỗi: “ORA-00845: MEMORY_TARGET not supported on this system” trên Oracle · Vấn đề / Problem · Nguyên nhân / Cause · Giải pháp / Solution · Bài …
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How to Resolve Error “ORA-00845: MEMORY_TARGET not …
This is not a Delphix error – this error is generated by the Oracle database instance, and usually occurs …
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Fix lỗi: “ORA-00845: MEMORY_TARGET not supported on …
1. Check select * from dictionary ORDER BY TABLE_NAME; —SYSTEM PRIVILEGES — liệt kê quyền tương ứng cua DBA select * from DBA_SYS_PRI… HỌC …
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Oracle startup not possible – but memory size seems to be fine
We get an ORA-00845: MEMORY_TARGET not supported on this system on startup. … tmpfs 7,9G 4,0K 7,9G 1% /dev/shm. Which indicates that there is …
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ORA-00845: MEMORY_TARGET … – Mohammad Nazmul Huda
The new Automatic Memory Management functionality uses /dev/shm on Linux for SGA and PGA management. The errors occur if either MEMORY_TARGET or …
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ORA-00845: MEMORY_TARGET not supported on this system … 2.. The new Automatic Memory Management functionality uses /dev/shm on Linux for SGA and …
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ORA-00845: MEMORY_TARGET not supported on this system
ORA-00845: MEMORY_TARGET not supported on this system … SQL> alter system set memory_max_target=1200m scope=spfile; System altered. SQL> alter system set …
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ORA-00845: MEMORY_TARGET not supported on this system
ORA-00845: MEMORY_TARGET not supported on this system … Modify the entry in “/etc/fstab” to have persistent settings between reboot of your …
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주제와 관련된 이미지 ora 00845 memory_target not supported on this system
주제와 관련된 더 많은 사진을 참조하십시오 ORA 00845 – Memory_target not supported. 댓글에서 더 많은 관련 이미지를 보거나 필요한 경우 더 많은 관련 기사를 볼 수 있습니다.
주제에 대한 기사 평가 ora 00845 memory_target not supported on this system
- Author: STAXALPHA
- Views: 조회수 812회
- Likes: 좋아요 6개
- Date Published: 2019. 2. 10.
- Video Url link: https://www.youtube.com/watch?v=ropUSCgOdR8
How do I fix my ORA 00845?
There are two possible ways to remove the ORA-00845 error. Reduce the value for the memory_target parameter Or Increase the temporary memory allocation on the server. I will increase the Shared Memory file system (shmfs). For this I will mount with increased space for tmps.
How do I resolve ORA 27102 out of memory?
This ORA-27102 errors are related with the Out of memory. SHMALL is the total amount of shared memory, in pages, that the system can use at one time. To solve this error, Set SHMALL equal to the sum of all the SGAs on the system, divided by the page size.
What is Memory_target and Memory_max_target?
MEMORY_TARGET should be set higher than or equal to the sum of the current sizes of the SGA and PGA. In a text-based initialization parameter file, if you omit MEMORY_MAX_TARGET and include a value for MEMORY_TARGET , then the database automatically sets MEMORY_MAX_TARGET to the value of MEMORY_TARGET .
How do I enable AMM?
- Start SQL*Plus and connect to the database as SYSDBA .
- Calculate the minimum value for MEMORY_TARGET as follows: …
- Choose the value for MEMORY_TARGET that you want to use.
What is Sga_max_size?
SGA_MAX_SIZE specifies the maximum size of the SGA for the lifetime of the instance. On 64-bit platforms and non-Windows 32-bit platforms, when either MEMORY_TARGET or MEMORY_MAX_TARGET is specified, the default value of SGA_MAX_SIZE is set to the larger of the two parameters.
How do I fix Ora 01034?
To resolve ORA-01034, be sure that the ORACLE_HOME and ORACLE_SID properly match within the files /etc/oratab or /var/opt/oracle/oratab . As a last step in solving your ORA-01034 problem and running DBUA, make sure that ORACLE_HOME is set to ‘old’ home, not ‘new’ home.
How do I resolve out of memory error in Oracle?
- Firstly You should run it with sqlplus commands. Log in the sqlplus and run this command. @scriptName.sql.
- Secondly (this is alternative) You can use DBLINK in oracle.
How does Linux calculate Shmall value?
The maximum supported value of SHMMAX on a 32-bit system is 4 GB – 1 byte. SHMALL is the division of SHMMAX/PAGE_SIZE, e.g:. 1073741824/4096=262144.
How do you change the SGA and PGA size in Oracle 19c?
Connect to the database sysdba sqlplus sys/oracle@op as sysdba 2. Increase sga_max_size to 6 GB as below SQL> ALTER SYSTEM SET sga_max_size=6144m scope=spfile; System altered. 3. Increase pga_aggregate_targe to 3 GB as below SQL> ALTER SYSTEM SET pga_aggregate_target= 3072MB SCOPE=spfile; 4.
What is the difference between SGA_Target and Memory_target?
SGA_Target is the size of the SGA not including the PGA. Memory_Target includes both. If the PGA_target + SGA_Target are > Memory_Target, you can get this error.
How do I change allocated memory in Oracle?
You can allocate MEMORY_TARGET parameter and oracle will handle both SGA + PGA. You do not even need to set SGA_TARGET or SGA_MAX_SIZE. Let us assume we have 16 GB RAM on a server and we want to allocate 5 GB to Oracle. This can be simple done by setting MEMORY_TARGET to 5 GB.
How do I check if AMM is enabled?
memory_target (starting in 11g): If memory_target is set, then AMM is enabled: If memory_target is set to non zero value and : sga_target, sga_max_size and pga_aggregate_target are set to 0, then 60% of memory mentioned in memory_target is allocated to SGA and rest 40% is kept for PGA.
How do I check my Oracle memory usage?
To get an idea for the different categories a process uses memory for, you can query the V$PROCESS_MEMORY table. This table shows the dynamic PGA memory usage for each Oracle processes and contains information, if used, for Java, PL/SQL, OLAP, and SQL areas.
What is automatic memory in C?
Automatic Memory Allocation
Automatic allocation happens when you declare an automatic variable, such as a function argument or a local variable. The space for an automatic variable is allocated when the compound statement containing the declaration is entered and is freed when that compound statement is exited.
What is Pga_aggregate_limit?
PGA_AGGREGATE_LIMIT specifies a limit on the aggregate PGA memory consumed by the instance. There is no difference in behavior between PGA_AGGREGATE_LIMIT being explicitly set or being set to the default. Actions Taken When PGA_AGGREGATE_LIMIT is Exceeded. Parallel queries will be treated as a unit.
What is Pga_aggregate_target?
PGA_AGGREGATE_TARGET specifies the target aggregate PGA memory available to all server processes attached to the instance. Setting PGA_AGGREGATE_TARGET to a nonzero value has the effect of automatically setting the WORKAREA_SIZE_POLICY parameter to AUTO .
What is SGA target?
SGA_TARGET specifies the total size of all SGA components. If SGA_TARGET is specified, then the following memory pools are automatically sized: Buffer cache ( DB_CACHE_SIZE ) Shared pool ( SHARED_POOL_SIZE )
How do I create a pfile?
- If the current container is the root, then the database creates a text file that contains the parameter settings for the root.
- Starting with Oracle Database 12c Release 1 (12.1. 0.2), you can create a text parameter file when the current container is a PDB. In this case you must specify a pfile_name .
ORA-00845: MEMORY_TARGET not supported on this system tips
Question: I was changing memory_max_target when I got this ORA-00845 error:
ORA-00845: MEMORY_TARGET not supported on this system
Answer: You will get a ORA-00845 error if your shared memory file system is not big enough to accommodate memory_target and memory_max_target. There are two possible ways to remove the ORA-00845 error:
– Reduce the value for the memory_target parameter
– Increase the temporary memory allocation on the server. This should fix the ORA-00845 error:
# umount tmpfs
# mount -t tmpfs shmfs -o size=1500m /dev/shm
The oerr message ORA-00845 addresses this error:
ORA-00845: MEMORY_TARGET not supported on this system
Cause: The MEMORY_TARGET parameter was not supported on this operating system or /dev/shm was not sized correctly on Linux.
Action: Refer to documentation for a list of supported operating systems. Or, size /dev/shm to be at least the SGA_MAX_SIZE on each Oracle instance running on the system.
Oracle says that if you want to use Linux HugePages make sure that both MEMORY_TARGET / MEMORY_MAX_TARGET initialization parameters are disabled for the database instance.
AMM is a memory-morphing tool that adjusts the sizes of the SGA pool reactively, as workloads change. It works well on tiny systems, but for large databases, the DBA can perform the SGA pool size adjustment proactively, before a workload change cripples performance.
Oracle does NOT recommend using Automatic Memory Management (AMM, e.g. setting memory_target) with Linux hugepages. See MOSC note 749851.1 “HugePages and Oracle Database 11g Automatic Memory Management (AMM) on Linux” for important details. In sum, AMM is not compatible with Linux Hugepages.
Also, beware that AMM re-size operations can cripple Oracle performance in some cases.
For mission-critical databases, I recommend building intelligent SGA monitors that predict workload changes before they occur and change the SGA just-in-time. For complete details, see my book Oracle Tuning: The Definitive Reference.
Fix lỗi: “ORA-00845: MEMORY_TARGET not supported on this system” trên Oracle
Khi thực hiện tạo thêm Instance cho Oracle Database, và thực hiện khởi động nó.
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ORA-00845: MEMORY_TARGET not supported on this system
How to Resolve Error “ORA-00845: MEMORY_TARGET not supported on this system” during Provisioning or V2P (KBA1663)
This issue is most likely to occur when using Linux target environments.
When attempting to provision a virtual database (VDB), or make a physical database using the Virtual to Physical feature (V2P), you may receive an error that says “ORA-00845: MEMORY_TARGET not supported on this system”.
Resolution
This is not a Delphix error – this error is generated by the Oracle database instance, and usually occurs when the database instance attempts to reserve more shared memory than is available on the system.
There are several possible causes for this error, including:
Running more Oracle instances on a host than it has physical resources for;
Having the shared memory configuration on the operating system too low for the MEMORY_TARGET defined by the database (Oracle Support document IDs 465048.1 and 1399209.1); or
1399209.1); or Provisioning to an environment which is configured with Linux HugePages, which is incompatible with the MEMORY_TARGET parameter (Oracle Support document ID 749851.1)
The Oracle alert log for the associated database should contain additional information, which will help you identify which of these issues is occurring.
If the provided MEMORY_TARGET is too high for the system The MEMORY_TARGET value will typically be inherited from the dSource configuration, or from a VDB Configuration Template if one has been supplied. To resolve this issue, select a smaller value for MEMORY_TARGET during provisioning. For more information on changing parameters during provisioning, including MEMORY_TARGET, please refer to the document Configuration Setting for Oracle Virtual Databases.
If the /dev/shm file system is too small To resolve this issue, please ask your system administrator to increase the size of /dev/shm. This is typically performed my modifying the filesystem table, /etc/fstab, e.g.: tmpfs /dev/shm tmpfs defaults,size=8g 0 0 /dev/shm should be large enough to handle all Oracle instances with a configured MEMORY_TARGET, as well as any other software running on the system which uses shared memory. After making changes, the /dev/shm filesystem will need to be remounted as follows when no Oracle instances are running: mount -o remount /dev/shm
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Oracle startup not possible – ORA-00845: MEMORY_TARGET not supported on this system – but memory size seems to be fine
Error Cause: The new Automatic Memory Management functionality uses /dev/shm on Linux for SGA and PGA management. The errors occur if either MEMORY_TARGET or MEMORY_MAX_TARGET is configured larger than the configured /dev/shm size, or if /dev/shm is mounted incorrectly.
SOLUTION: Please confirm that ORACLE_HOME is set correctly. This error sometimes happens when it is not set correctly.
Make sure that the /dev/shm size is configured large enough, like in: mount -t tmpfs shmfs -o size=7g /dev/shm
Note: You should check with your System Administrator what the “best” size for /dev/shm is, based on what has been reported in the alert file.
Also, many best practices now suggest disabling AMM especially in Exa* Engineered boxes that have larger memory capability and can use Huge / Large pages. This is because AMM and Huge / Large pages are mutually exclusive and overall performance will be better using Huge pages
Make sure that the df output shows the correct /dev/shm configuration when using Oracle on the system:
ORA-00845: MEMORY_TARGET not supported on this system (During Starting Instance )
APPLIES TO:
Oracle Database – Enterprise Edition – Version 11.1.0.6 and later
Oracle Database – Standard Edition – Version 11.2.0.1 to 11.2.0.1 [Release 11.2]
Linux x86
Linux x86-64
***Checked for relevance on 30-Sep-2014***
SYMPTOMS
During the startup of the database instance the following error is raised:
SQL> connect sys as sysdba
Enter password: *****
Connected to an idle instance.
SQL> STARTUP NOMOUNT
ORA-00845: MEMORY_TARGET not supported on this system
The instance alert file shows:
Starting ORACLE instance (normal)
WARNING: You are trying to use the MEMORY_TARGET feature.
This feature requires the /dev/shm file system to be mounted for at Least
bytes.The /dev/shm is either not mounted or is mounted with available space less than this size. Please fix this so that MEMORY_TARGET can work as expected. Current available is
and used is bytes.memory_target needs larger /dev/shm Also error messages like ORA-4031 may be reported and no new connections can be established to the database.
CHANGES
The Automatic Memory Management (AMM) has been implemented by setting parameters like MEMORY_TARGET and/or MEMORY_MAX_TARGET.
CAUSE
The new Automatic Memory Management functionality uses /dev/shm on Linux for SGA and PGA management. The errors occur if either MEMORY_TARGET or MEMORY_MAX_TARGET is configured larger than the configured /dev/shm size, or if /dev/shm is mounted incorrectly.
SOLUTION
Please confirm that ORACLE_HOME is set correctly. This error sometimes happens when it is not set correctly.
Make sure that the /dev/shm size is configured large enough, like in:
# mount -t tmpfs shmfs -o size=7g /dev/shm
In this case, the size of the shared memory device is configured to be 7GB.
In order to make the same change persistent across system reboots, add an entry for this to the /etc/fstab mount table, as in:
shmfs /dev/shm tmpfs size=7g 0
Note:
You should check with your System Administrator what the “best” size for /dev/shm is, based on what has been reported in the alert file. Also, many best practices now suggest disabling AMM especially in Exa* Engineered boxes that have larger memory capability and can use Huge / Large pages.
This is because AMM and Huge / Large pages are mutually exclusive and overall performance will be better using Huge pages
Make sure that the df output shows the correct /dev/shm configuration when using Oracle on the system:
$ df -k
Filesystem 1K-blocks Used Available Use% Mounted on
…
shmfs 6291456 832356 5459100 14% /dev/shm
This document is taken from Oracle Support Doc ID 465048.1
ORA-00845: MEMORY_TARGET not supported on this system – Oracle Ride
ORA-00845: MEMORY_TARGET not supported on this system Published by on
ORA-00845: MEMORY_TARGET not supported on this system
When I was opening 12cR2 database after installation I get a ORA-00845 error.
Because I am using Automatic Memory Management (AMM) feature & If Shared Memory file system (shmfs) is not big enough to accommodate memory_target and memory_max_target. Then i will get this error.
[[email protected] -] $ export ORACLE_SID=orcl [[email protected] -] $ sqlplus / as sysdba SQL*Plus: Release 12.2.0.1.0 Production on Tue Nov 6 12:23:37 2018 Copyright (c) 1982, 2016, Oracle. All rights reserved. Connected to an idle instance. SQL> startup ORA-00845: MEMORY_TARGET not supported on this system [[email protected] ]# df -h Filesystem Size Used Avail Use Mounted on dev/sda2 916 25G 62G 29% / tmpfs 1.1G 520K 1.16 1 /dev/sh /dev/sdal 190M 1134 63M 65% /boot /dev/sda3 9.5G 1.6G 7.5G 18% /tmp 12.2-data 1846 1416 446 77% /media/sf_12.2-data /dev/sr0 56M 56M 0 100% /media/Vox GAS 5.2.20There are two possible ways to remove the ORA-00845 error.
Reduce the value for the memory_target parameter Or Increase the temporary memory allocation on the server.
I will increase the Shared Memory file system (shmfs). For this I will mount with increased space for tmps.
[[email protected] -]# mount -t tmpfs shmfs – size 2g /dev/shmNow Check the filesystem size.
[[email protected] ]# df -h Filesystem Size Used Avail Use Mounted on dev/sda2 916 25G 62G 29% / tmpfs 2.0G 0 2.0G 0% /dev/shm /dev/sdal 190M 1134 63M 65% /boot /dev/sda3 9.5G 1.6G 7.5G 18% /tmp 12.2-data 1846 1416 446 77% /media/sf_12.2-data /dev/sr0 56M 56M 0 100% /media/Vox GAS 5.2.20 shmfs 2.0G 0 2.0G 0% /dev/shmBut same changes I will add in /etc/fstab file for permanent effect.
[[email protected] ]# vim /etc/fstab # # /etc/fstab # Created by anaconda on Mon Nov 5 07:52:06 2018 # # Accessible filesystems, by reference, are maintained under ‘/dev/disk’ # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # UUID=ddd1344e-d224-4100-8b4e-de0afd1a5080 / ext4 defaults 1 1 UUID=4bb5af18-fdc2-45ff-bdad-452db3c681c4 /boot ext4 defaults 1 2 UUID=65903f13-b00f-4ea4-8556-3ad72b52b508 /tmp ext4 defaults 1 2 UUID=46573343-1a4c-421a-befc-13404c61d08e swap swap defaults 0 0 #tmpfs /dev/shm tmpfs defaults 0 0 tmpfs /dev/shm tmpfs size=2g 0 0—–this line i have updated devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0The mount command mounts a storage device or file system making it accessible and attaching it to an existing directory structure.
Now Start the database.
[[email protected] ~]# su – oracle [[email protected] ~]$ [[email protected] ~]$ export ORACLE_SID=orcl [[email protected] ~]$ sqlplus / as sysdba SQL*Plus: Release 12.2.0.1.0 Production on Wed Nov 7 22:43:17 2018 Copyright (c) 1982, 2016, Oracle. All rights reserved. Connected to an idle instance. SQL> startup ORACLE instance started. Total System Global Area 1174405120 bytes Fixed Size 8619984 bytes Variable Size 838862896 bytes Database Buffers 318767104 bytes Redo Buffers 8155136 bytes Database mounted. Database opened.Now Error (ORA-00845: MEMORY_TARGET not supported on this system) is Resolved.
Check regularly my post and give feedback & comments!!!!.
Thanks
Ahmad (Riaz Ahmad Ansari)
OCE In (11g R2 RAC)
OCP In (11g/10g/9i)
ORA-27102: out of memory
I got ” ORA-27102: out of memory ” error in Oracle database.
ORA-27102: out of memory
Details of error are as follows.
ORA-27102: out of memory Cause: Out of memory Action: Consult the trace file for details
When trying to increase the SGA to approach half available RAM with an Oracle 64-bit version on a Linux 64-bit operating system, even though SHMMAX is set to match half the amount of RAM, you get the following error when trying to start the instance: SQL> startup nomount ORA-27102: out of memory Linux-x86_64 Error: 28: No space left on device
out of memory
This ORA-27102 errors are related with the Out of memory.
shmall is too small, most likely is set to the default setting of 2097152
$ cat /proc/sys/kernel/shmall 2097152
SHMALL is the total amount of shared memory, in pages, that the system can use at one time.
To solve this error, Set SHMALL equal to the sum of all the SGAs on the system, divided by the page size.
The page size can be determined using the following command:
$ getconf PAGE_SIZE 4096
For example, if the sum of all the SGAs on the system is 16Gb and the result of ‘$ getconf PAGE_SIZE’ is 4096 (4Kb) then set shmall to 4194304 pages
As the root user set the SHMALL to 4194304 in the /etc/sysctl.conf file:
kernel.shmall = 4194304
then run the following command:
$ sysctl -p $ cat /proc/sys/kernel/shmall 4194304
NOTE:
The above command loads the new value and a reboot is not necessary.
Switch back to the oracle user and retry the startup command.
Modifying /etc/sysctl.conf is a permanent workaround (applies at boot time). If for some reason you DO NOT want to change the system wide configuration, you can do it on the fly by directly changing the kernel pseudo FS AKA procfs.
e.g. echo “4194304” > /proc/sys/kernel/shmall
Using HUGEPAGES does not alter the calculation for configuring shmall.
Or you can remove SGA_* parameters from your pfile and set MEMORY_MAX_TARGET=500M MEMORY_TARGET=500M , then save pfile and restart database.
SQL> startup nomount pfile=’/home/oracle/pfile.ora’; SQL> alter database mount; SQL> alter database open;
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MEMORY
0 (SGA autotuning is disabled for DEFERRED mode autotuning requests, but allowed for IMMEDIATE mode autotuning requests)
MEMORY_TARGET specifies the Oracle systemwide usable memory. The database tunes memory to the MEMORY_TARGET value, reducing or enlarging the SGA and PGA as needed.
MEMORY_TARGET should be set higher than or equal to the sum of the current sizes of the SGA and PGA.
In a text-based initialization parameter file, if you omit MEMORY_MAX_TARGET and include a value for MEMORY_TARGET , then the database automatically sets MEMORY_MAX_TARGET to the value of MEMORY_TARGET . If you omit the line for MEMORY_TARGET and include a value for MEMORY_MAX_TARGET , the MEMORY_TARGET parameter defaults to zero. After startup, you can then dynamically change MEMORY_TARGET to a nonzero value, provided that it does not exceed the value of MEMORY_MAX_TARGET .
Total memory usage can grow beyond the value of MEMORY_TARGET . For example, memory is allocated to PL/SQL tables and varrays regardless of the value of MEMORY_TARGET as long as memory is available at the operating system level.
In the Default value field, IMMEDIATE mode autotuning requests are necessary to avoid ORA-04031 errors. The DEFERRED and IMMEDIATE modes are reflected in the OPER_MODE column of the V$MEMORY_RESIZE_OPS view.
Note: The default value of SGA_MAX_SIZE depends on the values of MEMORY_TARGET and MEMORY_MAX_TARGET .
Enabling Automatic Memory Management
Determine the current sizes of SGA_TARGET and PGA_AGGREGATE_TARGET by entering the following SQL*Plus command:
SHOW PARAMETER TARGET
SQL*Plus displays the values of all initialization parameters with the string TARGET in the parameter name.
NAME TYPE VALUE —————————— ———– —————- archive_lag_target integer 0 db_flashback_retention_target integer 1440 fast_start_io_target integer 0 fast_start_mttr_target integer 0 memory_max_target big integer 0 memory_target big integer 0 parallel_servers_target integer 32 pga_aggregate_target big integer 29M sga_target big integer 356M
Or, on the Initialization Parameters page in Oracle Enterprise Manager Database Express (EM Express), you can enter “TARGET” in the Search field to display the values of all the initialization parameters with the string TARGET in the parameter name, as described in “Viewing and Modifying Initialization Parameters.”
ORA-00845: MEMORY_TARGET not supported on this system
1.. While trying to start database
2.. The new Automatic Memory Management functionality uses /dev/shm on Linux for SGA and PGA management. The errors occur if either MEMORY_TARGET or MEMORY_MAX_TARGET is configured larger than the configured /dev/shm size, or if /dev/shm is mounted incorrectly.
3.. Now login with the root and make sure that the /dev/shm size is configured large enough
4.. To make the same change persistent across system reboots, add an entry for this to the /etc/fstab mount table
5.. Now login as sysdba and execute startup
Note:- /dev/shm is implementation of traditional shared memory concept. It is an efficient means of passing data between programs. One program will create a memory portion, which other processes (if permitted) can access. This will result into speeding up things on Linux. shm / shmfs is also known as tmpfs, which is a common name for a temporary file storage facility on many Unix-like operating systems. It is intended to appear as a mounted file system, but one which uses virtual memory instead of a persistent storage device.
When type df -h the mount command you will show /dev/shm as a tempfs file system. Therefore, it is a file system, which keeps all files in virtual memory. Everything in tmpfs is temporary in the sense that no files will be created on your hard drive. If you unmount a tmpfs instance, everything stored therein is lost. By default, almost all Linux distros configured to use /dev/shm.
Reference :- Doc ID 465048.1
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ORA # # #00845 #- #Memory_target #not #supported
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