Zabbix 4.0 slow queries

[superset]

Hi,

I noticed we had quite a few slow queries in the zabbix server log so i decided to pull the log from the DB to see what was going on. I noticed this specific query showing up 324573 times in 1 day.

# User@Host: xxx[xxx] @ [xxx.xxx.xxx.xxx]
# Thread_id: 6091675 Schema: zabbix QC_hit: No
# Query_time: 0.000103 Lock_time: 0.000031 Rows_sent: 1 Rows_examined: 1
# Rows_affected: 0
SET timestamp=1573478290;
SELECT NULL FROM config c;


Anybody who can tell me where this is coming from?

[dimir]

It's coming from frontend. On every connection it's checking the integrity of config table this way.