Mongodb database Schema Design with shared data

Question

Hi I am newbie to mongodb.I am using java.

I have 4 tables Tenant,system,authorization in my relational table.

Something like this.

Table          


        

Answer 1

You may need just one collection with all the documents, of course you will end up by having too many repeated field but this is the trick to scale well. For the Relations the type one to many and one to one you will just remove the identifier and put the rest of the attributes because MongoDB will take care of the primary key. ('I love MongoDB for that').

For the many to many relationship that you have between Tenant and System you will have to change it to an array in MongoDB data structure.

coll{
Tenant : 'value',
tenant_info : 'value',
Sys_info: 'value' ,
auth_info: 'value' ,
Prop_info : array [ 'value','value',''value....]
}