> And also this:
> "NDB is an in-memory storage engine"

No longer true: As of MySQL 5.1.6 it's possible to store
tables on disk rather than in memory.

See http://dev.mysql.com/doc/refman/5.1/...disk-data.html

But, I wouldn't recommend using MySQL cluster to power your
high traffic website. I've tested it but the throughput is at least 10 -
worse in compare to a good old MySQL master / slave setup on the
same hardware. Esspecially the writes are slow.

SQL Relay offers load balancing functionality, without having to change
your existing code: http://sqlrelay.sourceforge.net/