Scale out

Glossary

Scale-out

Explain what scale-out means.

What is scale-out?

Scaling out is a method for expanding the processing power of a server system by installing multiple servers with the same configuration and functions and distributing processing to improve overall performance. In contrast, scaling up is a method for increasing processing power by upgrading the server's CPU or increasing memory.

The advantage of scale-out is that by using multiple machines, you can improve overall processing capacity even if the performance of each individual machine is not particularly high. Another advantage is that availability is increased, as if a problem occurs with one machine, other machines can take over processing.

Scaling out is suitable when data consistency and differences in execution order between multiple servers are not an issue and independent parallel execution is possible. A specific example would be a search engine, where a large number of requests sent from the network must be processed simultaneously, but each individual process is relatively simple. On the other hand, scaling up is suitable when data consistency and simultaneous updates between servers are required.

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