Summary
In the update_operation of the database_operation class, after selecting a random collection to update, we generate a random key using the get_key_count function on the collection. Instead, we could use a random cursor, find a random record and retrieve the key. This is already done in the remove_operation of the same class.

Motivation

• Is this issue urgent?
  No

Acceptance Criteria (Definition of Done)

• Testing
  Use random cursors instead of relying on get_key_count

• Documentation update
  There should be none.

Suggested Solution
See the remove_operation implementation.