Lernkarten
Which parts does the CAP theorem consist of?
Consistency
Availability
Partition-tolerance
What does consistency (CAP Theorem) mean?
every node has the same consistent state
What does availability (CAP Theorem) mean?
Every non-failing node always returns a response
What does partition-tolerance (CAP Theorem) mean?
The system continues to be consistent even when network paritions
What is vertical scaling?
More hardware in the same machine
What does horizontal scaling mean?
multiple machines
What are the advantages of vertical scaling?
- lower cost at small scale
- no adaption of software required
- less administrative effort
- less power consumption
What are disadvantages of vertical scaling?
- risk of HW failure causing outage / more difficult to add fault tolerance
- HW limits for scaling / limited by moores law
