Would anybody please specify, I am writing to a collection in primary node, having following questions:

1) Does it provide write lock to database level while writing to the primary collection?

2) If write lock is there does it prevent any read operation?

3) PLeas eexplain how concurrency work in Replica set, while inserting is performing on primary's single collection .

4) Does one collection is affects persofmance of othe collection residing under same database ?