THE ARCHITECTURE OF THE DALI MAIN MEMORY STORAGE MANAGER

The performance needs of many database applications require that the e ntire database be stored in main memory. The Dali system is a main mem ory storage manager designed to provide the persistence (that is, the retention of data after a crash), availability, and safety guarantees that users typically expect from a disk-resident database including su pport for transactions Because ii is tuned to support in-memory data, Dali offers very high performance. User processes map the entire datab ase into their address space and access data directly, thereby avoidin g expensive remote procedure calls and buffer manager interactions typ ical of accesses in the disk-resident commercial systems available tod ay. Dali recovers from a system or process failure by restoring the da tabase to a consistent state, It also provides unique concurrency cont rol and memory protection features as well as index management and a r elational application programming interface.