B.4.2.17 File Not Found and Similar Errors
If you get
file_name' not found (errno: 23)
Can't open file: , or any other error with
file_name (errno: 24)
errno 23 or
errno 24 from MySQL, it means that you have not allocated enough file descriptors for the MySQL server. You can use the perror utility to get a description of what the error number means:
shell> perror 23 OS error code 23: File table overflow shell> perror 24 OS error code 24: Too many open files shell> perror 11 OS error code 11: Resource temporarily unavailable
The problem here is that mysqld is trying to keep open too many files simultaneously. You can either tell mysqld not to open so many files at once or increase the number of file descriptors available to mysqld.
To tell mysqld to keep open fewer files at a time, you can make the table cache smaller by reducing the value of the
table_open_cache system variable (the default value is 64). This may not entirely prevent running out of file descriptors because in some circumstances the server may attempt to extend the cache size temporarily, as described in Section 22.214.171.124, “How MySQL Opens and Closes Tables”. Reducing the value of
max_connections also reduces the number of open files (the default value is 100).
To change the number of file descriptors available to mysqld, you can use the
--open-files-limit option to mysqld_safe or set the
open_files_limit system variable. See Section 5.1.7, “Server System Variables”. The easiest way to set these values is to add an option to your option file. See Section 126.96.36.199, “Using Option Files”. If you have an old version of mysqld that does not support setting the open files limit, you can edit the mysqld_safe script. There is a commented-out line ulimit -n 256 in the script. You can remove the
# character to uncomment this line, and change the number
256 to set the number of file descriptors to be made available to mysqld.
--open-files-limit and ulimit can increase the number of file descriptors, but only up to the limit imposed by the operating system. There is also a “hard” limit that can be overridden only if you start mysqld_safe or mysqld as
root (just remember that you also need to start the server with the
--user option in this case so that it does not continue to run as
root after it starts up). If you need to increase the operating system limit on the number of file descriptors available to each process, consult the documentation for your system.
If you run the tcsh shell, ulimit does not work! tcsh also reports incorrect values when you ask for the current limits. In this case, you should start mysqld_safe using sh.