Where is body field label stored in database Due some caching problems I can't immediately change field label via /admin/structure/types/manage/page/fields. So I thought that I will able to do it from mysql but I can't find it. Any help?

Please note, that I have developement state here /admin/config/development/performance - no caching at all, no compressing
The field label, together with all other settings are stored as a serialized array in the field_config_instance table.

Manually changing a serialized array is usually a bad idea, it can destroy the data in there if you don't know what you are doing.