A table can be bound to a specific cache. If a table is not bound to a specific cache, but its database is bound to a cache, all of its I/O takes place in that cache.
Otherwise, the table’s I/O takes place in the default data cache. You can configure the default data cache for large I/O. Applications that use heap tables are likely to give the best performance when they use a cache configured for 16K I/O.
See Chapter 4, “Configuring Data Caches,” in the System Administration Guide: Volume 2.
