But, first of all, what is SAP HANA?
SAP HANA is SAP AG’s implementation of in-memory database technology. An in-memory database (IMDB; also main memory database system or MMDB or memory resident database) is a database management system that primarily relies on main memory for computer data storage. It is contrasted with database management systems which employ a disk storage mechanism. Main memory databases are faster than disk-optimized databases since the internal optimization algorithms are simpler and execute fewer CPU instructions. Accessing data in memory eliminates seek time when querying the data, which provides faster and more predictable performance than disk.
So, according with Wikipedia, HANA DB takes advantage of the low cost of main memory (RAM), data processing abilities of multi-core processors and the fast data access of solid-state drives relative to traditional hard drives to deliver better performance of analytical and transactional applications. It offers a multi-engine query processing environment which allows it to support both relational data (with both row- and column-oriented physical representations in a hybrid engine) as well as graph and text processing for semi- and unstructured data management within the same system. HANA DB is 100% ACID compliant.
Now, the newest version of SAP BPC (SAP BPC 10) can take the advantages of a SAP HANA DB. This means a lot of things as fast data access, speed, and many other feautures.
Of course this kind of implementation can be done by big customers that have a really complex database environment.
By the way SAP HANA will be the next generation of EPM implementation giving owr customer all the power needed.
Here the architecture schema: