update /test/alert_status set connect = nil
;

select connect FROM /test/alert_status refresh
/**
output()
matchcount("connect._all.len",0,4)
**/
;

update /test/alert_status set connect = connect + "Project:prj{%d,mqli}"
/**
loop(10)
parallel(10)
**/
;

select connect FROM /test/alert_status refresh
/**
output()
matchcount("connect._all.len",10,4)
**/
;