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How to edit the my.cnf

Discussion in 'Database Discussion' started by jyhqp, Apr 21, 2013.

  1. jyhqp

    jyhqp Registered

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    Due to the default value of variable max_allowed_packet is 1M,I tried to import SQL files to my database but failed. It seems it is read-only in current version. I searched the solution in google and people said I must update it in my.ini.Can anyone tell me how to do this? As detailedly as possible,I am a layman to Linux. Thank you very much!
     
    #1 jyhqp, Apr 21, 2013
  2. arunsv84

    arunsv84 Well-Known Member

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    1. Login to server via ssh (Use a client like putty if you are on a windows machine)

    Putty Download

    Steps to Login using Putty

    2. Backup the existing my.cnf file using the following command.

    3. Now edit the Config file and modify it according to your requirement.

    Search for max_allowed_packet in the above file.

    Edit the required value. Something higher like 16M or 32M.

    Save and quit. (To save and quit using vi editor, press [Esc] key and then : (the colon). For example, to exit from vi saving changes, press [Esc], : (colon) and type wq )

    4. Restart MySQL using the following command.

    Thanks!
     
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    #2 arunsv84, Apr 22, 2013
  3. jyhqp

    jyhqp Registered

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    Hi arunsv84 , I done what you said,but could not see the max_allowed_packet. As follow:

    1.jpg 2.jpg

    - - - Updated - - -

    Can anyone help me?
     
    #3 jyhqp, Apr 22, 2013
  4. arunsv84

    arunsv84 Well-Known Member

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    Yes. I have checked your screenshot and its not set on your my.cnf. If you wish to set some particular value just set it as mentioned before and restart MySQL.
     
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    #4 arunsv84, Apr 22, 2013
  5. wipes

    wipes Registered

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    Hi I have one question for you. I see how to do a back up for the my.cnf file, but what is the command to restore the my.cnf file if I need to. Thanks you in advance.
     
    #5 wipes, Sep 13, 2013
  6. Sys Admin

    Sys Admin Well-Known Member

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    You can just cp the backed up file back to it's original place using the below command then restart the mysql server.

    cp -af /etc/my.cnf.bakup /etc/my.cnf
     
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    #6 Sys Admin, Sep 14, 2013
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