Here is the quick notes from MySQL Cluster by Stewart Smith session that I attended today in the MySQL conference 2008.
- What it is
- Clustering of in memory databases in a shared-nothing system
- Designed for HA, 99.9% Uptime (not really) and sub-second failover
- Supports Hot (online) consistent backup along with compression
- No locks are used during the backup as NDB uses a global counters
- Think as virtual file system
- Redundancy
- NoOfReplicas (1,2,3,4), For production use 1 or 2 but don’t use any other as it may have bugs (2 is preferred and well tested mode)
- 1 means no redundancy (a node fails and cluster fails)
- 2 means two copies …