Emergency handling in LLD - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the primary goal of emergency handling in system design?

The primary goal is to detect, respond to, and recover from unexpected failures or critical situations to maintain system stability and minimize downtime.

beginner

Name three common strategies used in emergency handling.

1. Failover to backup systems<br>2. Graceful degradation of services<br>3. Alerting and automated recovery processes

beginner

Why is it important to have monitoring and alerting in emergency handling?

Monitoring detects issues early, and alerting notifies the right people or systems to act quickly, reducing the impact of emergencies.

intermediate

Explain the concept of 'graceful degradation' in emergency handling.

Graceful degradation means the system continues to operate with reduced functionality instead of failing completely during emergencies.

intermediate

What role does redundancy play in emergency handling?

Redundancy provides backup components or systems that can take over immediately if the primary ones fail, ensuring continuous operation.

Which of the following is NOT a typical emergency handling strategy?

A Failover to backup systems

B Ignoring alerts to reduce noise

C Graceful degradation

D Automated recovery

Ignoring alerts can worsen emergencies; proper alerting is essential.

What does 'failover' mean in emergency handling?

A Ignoring system failures

B Shutting down the system immediately

C Increasing system load intentionally

D Switching to a backup system when the primary fails

Failover means switching to backup systems to maintain service.

Why is monitoring important in emergency handling?

A To disable backups

B To slow down the system

C To detect issues early

D To increase system complexity

Monitoring helps detect problems early for quick response.

What does 'graceful degradation' help prevent?

A Complete system failure

B Faster system startup

C Increased user load

D Data backup

Graceful degradation allows partial operation instead of full failure.

Which component is essential for automated recovery?

A Monitoring and alerting systems

B Manual intervention only

C Ignoring system logs

D Disabling backups

Monitoring and alerting enable automated recovery actions.

Describe the key steps involved in handling an emergency in a system.

Think about how a system notices a problem and what happens next.

Explain how redundancy and graceful degradation work together during emergencies.

Consider backup systems and how the system behaves under stress.