Changing the tmp folder of mysql

Question

Our Mysql queries use temporary tables which creates temporary files in the process  Currently the files are written to  tmp  How exactly can the path of the temp folder to which mysql writes to be changed

User · Answer

You can also set the TMPDIR environment variable  In some situations  Docker in my case  it s more convenient to set an environment variable than to update a config file

User · Answer

This is answered in the documentation   Where MySQL Stores Temporary Files     On Unix  MySQL uses the value of the TMPDIR environment variable as   the path name of the directory in which to store temporary files  If   TMPDIR is not set  MySQL uses the system default  which is usually    tmp   var tmp  or  usr tmp       On Windows  Netware and OS2  MySQL checks in order the values of the   TMPDIR  TEMP  and TMP environment variables  For the first one found   to be set  MySQL uses it and does not check those remaining  If none   of TMPDIR  TEMP  or TMP are set  MySQL uses the Windows system   default  which is usually C  windows temp

User · Answer

if you dont have apparmor or selinux issues  but still get errorcode 13 s   mysql must be able to access the full path  I e  all folders must be mysql accessible  not just the one you intend in pointing to   example  you try using this in your mysql configuration  tmp    some folder on disk    will work  as user root  mkdir -p  some folder on disk chown -R mysql mysql  some    will not work  also as user root  mkdir -p  some folder on disk chown -R mysql mysql  some folder on disk

User · Answer

This maybe helpful for MySql with AppArmor stop mysql   sudo  etc init d mysql stop  Create directory called  somewhere tmp Edit Config  sudo vim  etc mysql my cnf     or perhaps sudo vim  etc mysql mysql conf d mysqld cnf change  tmpdir    somewhere tmp   Then sudo vim  etc apparmor d usr sbin mysqld  Add   Allow data dir access    somewhere  r     somewhere    rwk    sudo chown -R root root  somewhere   sudo chmod -R 1777  somewhere  Restart  sudo  etc init d apparmor reload   sudo  etc init d mysql restart

User · Answer

You should edit your my cnf  tmpdir    whatewer you want   and after that restart mysql  P S  Don t forget give write permissions to  whatewer you want for mysql user

User · Answer

Here is an example to move the mysqld tmpdir from  tmp to  run mysqld which already exists on Ubuntu 13 04 and is a tmpfs  memory ram    sudo vim  etc mysql conf d local cnf   Add    mysqld  tmpdir    run mysqld   Then   sudo service mysql restart   Verify   SHOW VARIABLES LIKE  tmpdir                                                                         If you get an error on MySQL restart  you may have AppArmor enabled   sudo vim  etc apparmor d local usr sbin mysqld   Add      Site-specific additions and overrides for usr sbin mysqld    For more details  please see  etc apparmor d local README   run mysqld  r   run mysqld    rwk    Then    sudo service apparmor reload    sources  http   2bits com articles reduce-your-servers-resource-usage-moving-mysql-temporary-directory-ram-disk html  https   blogs oracle com jsmyth entry apparmor and mysql

[mysql] Changing the tmp folder of mysql

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