Discuz! Database Error

The database has encountered a problem. Need Help?

Error messages:

[Type] 查询语句错误 [3] Error writing file '/tmp/MY5g12c3' (Errcode: 28 - No space left on device) [Query] SELECT a.tid FROM forum_thread a inner join forum_forum b on a.fid=b.fid ORDER BY a.tid DESC LIMIT 0,40000

Program messages:

[Line: 0051]forum.php(discuz_core->init) [Line: 0071]source/class/class_core.php(discuz_core->_init_cron) [Line: 0448]source/class/class_core.php(discuz_cron->run) [Line: 0046]source/class/class_cron.php(include) [Line: 0024]source/include/cron/cron_sitemap.php(DB->query) [Line: 0981]source/class/class_core.php(DB->_execute)

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