TOPIC: Issue log versus Risk Register versus change log

Hi Friends ,
Let say a incident is happened .As a Project Manager ,under what circumstances we need to go for Issue log , change request and risk register ? A detailed explanation with examples could be better to understand .

Have a nice day ,

Regards

Here's my thoughts simplified based on past experience, although I cannot say for sure what the PMBOK says since I'm just beginning to study it.

1. First everything starts as an issue.
2. This issue could escalate to become a change.
3. That change might carry a risk with it.

These are discussed in the PMBOK guide, but I will try and give examples.
Issue log: Anything that is a problem, some kind of process gap, or inconsistency, or conflicts related to a project that needs to be documented. Of course this would be tracked with the typical who, what, when detail. Its a way of tracking and documenting these issues.

Change Request: Is a formal way to request a change to any document, deliverable or baseline. It can be for changing policies, scope, budget, schedule items, things that really impact the project.

Risk Register: A risk register may be completed up front prior to a project starting, as it lists all the risks that could happen. Literally, these things get thought out and documented. It may also be updated during the project as needed. If it is a possible risk, it gets documents either before or during the project.