zabbix2.2.3 proxy how to clear history cache

[caoyang001]

Hi,

tcpdump -i eth0 -nnAlvv host ip


"key":"web.test.rspcode[...........................,counter]",
"clock":1434622901,
"ns":252763977,
"value":"200"},
{
"host":"Comment_Count_108_sjs",
"key":"web.test.in[...........................,,bps]",
"clock":1434622901,
"ns":252895973,
"value":"102840.000000"},
{
"host":"Comment_Count_108_sjs",
"key":"web.test.fail[...........................]",
"clock":1434622901,
"ns":252895973,
"value":"0"},
{
"host":"ShouFengWeb89.sjs.ifengidc.com",
"key":"inetdbport[1362]",
"clock":1434622901,
"ns":254815616,
"value":"1"},
{
"host":"ShouFengWeb102.sjs.ifengidc.com",
"key":"inetdbport[1362]",
"clock":1434622901,
"ns":254969987,
"value":"1"}],


"clock":1434622901 is 2015-06-18 18:21:41

but now time 2015-06-18 19:58:00 , i found zabbix proxy is send about an hour ago value , so i want to clear the history cache. make zabbix proxy send the current data. What should I do ? thank you