I same problem with mysql...

[debora]

This is the zabbix_server.log

003836:20060801:162212 Timeout while receiving data from [guri11]003836:20060801:162212 Timeout while receiving data from [guri11]
003836:20060801:162212 Getting value of [vfs.fs.size[E:,free]] from host [guri11] failed
003836:20060801:162212 The value is not stored in database.
003836:20060801:162813 Timeout while receiving data from [guri39]
003836:20060801:162813 Getting value of [proc.num[]] from host [guri39] failed
003836:20060801:162813 The value is not stored in database.
003836:20060801:162846 Timeout while receiving data from [guri39]
003836:20060801:162846 Getting value of [system.cpu.load[,avg1]] from host [guri39] failed
003836:20060801:162846 The value is not stored in database.
003836:20060801:162906 Timeout while receiving data from [guri22]
003836:20060801:162906 Getting value of [proc.num[]] from host [guri22] failed
003836:20060801:162906 The value is not stored in database.
003836:20060801:163547 Timeout while connecting to [guri22]
003836:20060801:163547 Host [guri22]: first network error, wait for 15 seconds

[sid]

Is this really a problem with sql? It might be an issue between the Zabbix server and agent. Are you sure there is an active connection and Zabbix is able to pull data from the target agent?