ScaleDB and Oracle RAC are both clustered databases that use a
shared-disk architecture. As I have mentioned previously, they
both actually share data via a shared cache, so it might be more
appropriate to call them shared-cache databases.
Whether it is called shared-disk or shared-cache, these databases must orchestrate the sharing of a single set of data amongst multiple nodes. This introduces two challenges: the physical sharing of the data and the logical sharing of the data.
Raw storage …