strange in zabbix server log file

[jix]

Hi
Sometimes
i saw in my zabbix server log file some patterns that doesn't shows regular !

Like...

update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=183208;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=183625;
update items set lastclock=1340616031,prevorgvalue='73162',prevvalue=lastvalue,lastvalue='0' where itemid=184225;
update items set lastclock=1340616030,prevorgvalue='990231839',prevvalue=lastvalue,lastvalue='4' where itemid=184229;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=185185;
update items set lastclock=1340616030,prevorgvalue='2528399902',prevvalue=lastvalue,lastvalue='8' where itemid=185277;
update items set lastclock=1340616030,prevorgvalue='137470532',prevvalue=lastvalue,lastvalue='9' where itemid=185279;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=186629;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=187349;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=187378;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=187380;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=187710;
update items set lastclock=1340616031 where itemid=188427;
update items set lastclock=1340616030 where itemid=188429;
update items set lastclock=1340616025,prevvalue=lastvalue,lastvalue='0.000000' where itemid=189138;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=189778;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=190377;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=190378;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=190379;
update items set lastclock=1340616030,prevorgvalue='53632',prevvalue=lastvalue,lastvalue='0' where itemid=190976;
update items set lastclock=1340616030,prevorgvalue='3257507535',prevvalue=lastvalue,lastvalue='121615' where itemid=191127;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=191425;
update items set lastclock=1340616030,prevorgvalue='829904509019',prevvalue=lastvalue,lastvalue='0' where itemid=192210;
update items set lastclock=1340616030,prevorgvalue='15040416885551',prevvalue=lastvalue,lastvalue='130123080' where itemid=192566;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=192568;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=192570;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=192628;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=193077;
update items set lastclock=1340616030,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=193079;
update items set lastclock=1340616031,prevorgvalue='0',prevvalue=lastvalue,lastvalue='0' where itemid=193080;
update items set lastclock=1340616027,prevvalue=lastvalue,lastvalue='1' where itemid=193107;
update items set lastclock=1340616027,prevvalue=lastvalue,lastvalue='1' where itemid=193167;
update items set lastclock=1340616027,prevvalue=lastvalue,lastvalue='1' where itemid=193227;
update items set lastclock=1340616027,prevvalue=lastvalue,lastvalue='1' where itemid=193287;
update items set lastclock=1340616027,prevvalue=lastvalue,lastvalue='1' where itemid=193347; 

can anybody tell me
what does it mean?

debug level 3,
zabbix server 1.8.12 on debian 6 with 32000 items and 47000 trigers !

[jix]

!

any idea about this?