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How to Fix an (errno: 24) in MySQL

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  • How to Fix an (errno: 24) in MySQL

    How to Fix an (errno: 24) in MySQL

    When creating a large number of partitions or tables, MySQL may mysteriously stop working and you find this type of error on /var/lib/mysql/$HOSTNAME.err:

    [ERROR] /usr/sbin/mysqld: Can't open file: './database/table.frm' (errno: 24)

    errno: 24 simply means that too many files are open for the given process. There is a read-only mysql variable called open_files_limit that will show how many open files are allowed by the mysqld:

    SHOW VARIABLES LIKE 'open%'

    A lot systems set this to something very low, like 1024. Unfortunately, the following will NOT work:

    SET open_files_limit=100000

    MySQL will respond with:

    ERROR 1238 (HY000): Variable 'open_files_limit' is a read only variable

    However, it is possible to make a change to /etc/my.cnf. This file may not exist, if not, just create it. Be sure it has the following contents:

    [mysqld]
    open_files_limit = 100000

    Then, be sure to restart mysql:

    sudo /etc/init.d/mysql restart

    Now, SHOW VARIABLES LIKE 'open%' should show 100000. The number you use may be different.
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