To be sure data are polled and stored in database run this query (use your poller name instead of <Your_custom_poller_name>):
select cp.OID
, cp.uniquename
, cp.snmpgettype
, cp.netobjectprefix
, cp.pollertype
, cp.formula
, ca.assignmentname
, cs.datetime
, cs.rate
, cs.total
, cs.rawstatus
, cs.status
, cs.RowID
from dbo.CustomPollers cp
, dbo.CustomPollerAssignment ca
, dbo.CustomPollerStatus cs
where cp.uniquename = '<Your_custom_poller_name>'
and cp.custompollerid=ca.custompollerid
and ca.custompollerassignmentid=cs.custompollerassignmentid
order by ca.assignmentname, cs.datetime
