I've deleted it before your answer, just after reading manual
Nevertheless, my story hasn't finished. I've migrated my prev MySQL DB (it was based on zabbix 2.4.3) to the Oracle, but now the next error occured:
The server does not match Zabbix database. Current database version (mandatory/optional): 02040000/02040000. Required mandatory version: 02020000.
It's a little bit strange cause zbx version hasn't changed, isn't it? :-\