Read Uncommitted: Transactions are not isolated from each other. If the DBMS supports other transaction isolation levels, it ignores whatever mechanism it uses to implement
Category: database
Criteria to order keys in MongoDB compound indexes
In MongoDB when we are creating a compound index, the keys order defining the index matters. These 2 compund indexes below are different, resulting in
Data Mapper vs Active Record
Using the Active Record approach, you define all your query methods inside the model itself, and you save, remove, and load objects using model methods.