缺少环境变量配置，试试配置下oracle环境变量

cat /etc/sysconfig/zabbix-server
export ORACLE_HOME=/usr/lib/oracle/11.2/client64
export LD_LIBRARY_PATH=/usr/lib/oracle/11.2/client64/lib:/usr/lib64
export TNS_ADMIN=/usr/lib/oracle/11.2/client64/network/admin
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/usr/lib/oracle/11.2/client64/lib

service zabbix-server restart