Discuz! info: MySQL Query Error

Time: 2008-7-27 4:10pm
Script: /bbs/index.php

SQL: SELECT uid, username, groupid, invisible, action, lastactivity, fid FROM cdb_sessions ORDER BY uid DESC
Error: Record has changed since last read in table 'cdb_sessions'
Errno.: 1020

Similar error report has beed dispatched to administrator before.