Memory usage for scalable usermeta queries

Just to put here the suggestion that came up after discussing the requirement on chat.

Due to the complexity of user filtering/search required, the wordpress user data tables is not a very good place to store the user’s attributes. Instead it will make more sense to have a CPT and related taxonomies to store the user attributes required for the GUI, while maintaining basic information in the wordpress user table for login/authentication purposes.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)