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Home/ Questions/Which is the way to fix ora-00845: memory_target not supported on this system error?
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Dr. Cindy Dooley II
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Dr. Cindy Dooley II
Asked: July 21, 20222022-07-21T08:16:13+00:00 2022-07-21T08:16:13+00:00In: Error

Which is the way to fix ora-00845: memory_target not supported on this system error?

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Hi experts, please help me solve this problem: ora-00845: memory_target not supported on this system.

The following error is generated upon database instance startup:

SQL> connect sys as sysdba
Enter password: *****
Connected to an idle instance.

SQL> STARTUP NOMOUNT
ORA-00845: MEMORY_TARGET not supported on this system

What is the cause of this message? How to fix it quickly?

Thanks in advance.

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    dttutoria Expert
    2022-07-21T08:35:15+00:00Added an answer on July 21, 2022 at 8:35 am

    The cause: 

    Linux’s /dev/shm is used by the new Automatic Memory Management function to manage SGA and PGA. The issues happen if /dev/shm is mounted wrongly or if MEMORY TARGET or MEMORY MAX TARGET are specified with values greater than the configured /dev/shm size.

    Solution:

    Do as the following instruction to fix ora-00845: memory_target not supported on this system error.

    Verify that ORACLE HOME is properly set. When it is not set properly, this error can occasionally occur.

    Make sure the /dev/shm size is set to a size that is sufficient, as in:

    # mount -t tmpfs shmfs -o size=7g /dev/shm

    The shared memory device in this instance has a 7GB configuration.

    Attack an entry for it to the /etc/fstab mount table to ensure that the same change is maintained after a system restart, as in:

    shmfs /dev/shm tmpfs size=7g 0
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