At Cloud architecture tutorial given at QCon London 2012 Adrian Cockcroft presented mean latency times for simple key lookup queries for different types of data stores:
- Memcached: <1 ms (network latency dominates)
- Cassandra: ~1 ms
- Oracle for simple queries: 1-5 ms
- DynamoDB: ~5 ms
- SimpleDB replicaIon and REST overheads: >10 ms
Just like Jeff Dean’s “Numbers Everyone Should Know“, these numbers should be common knowledge of programmers.
Related articles
- Trying to add latency (gearslutz.com)
- Most Important Software Development Trends for 2012, as Voted by QCon London Attendees (infoq.com)
- Community News: Focus on Latency and Scalability (newrelic.com)
- How to Measure Latency in the Cloud (strom.wordpress.com)
