Discuz! Database Error

(1317) Query execution was interrupted
SELECT aid,title,pic FROM portal_article_title where catid='534' order by rand() limit 8

PHP Debug

No.FileLineCode
1portal.php32require_once(%s)
2source/module/portal/portal_view.php149discuz_database::query(%s)
3source/class/discuz/discuz_database.php142db_driver_mysqli->query(%s, false, false)
4source/class/db/db_driver_mysqli.php148db_driver_mysqli->halt(%s, %d, %s)
5source/class/db/db_driver_mysqli.php223break()
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