Clustering

Disambiguation

“MySQL Cluster” disambiguation…

• NDB Cluster — A specialized, mostly in-memory, engine. Not widely used.
• Galera Cluster aka Percona XtraDB Cluster aka PXC aka MariaDB with Galera. — A very good High Availability solution for MySQL; it goes beyond Replication.

See individual pages on those variants of “Cluster”.

For “clustered index” see page(s) on PRIMARY KEY.