Oracle Corporation
STORING DERIVED SUMMARIES ON PERSISTENT MEMORY OF A STORAGE DEVICE

Abstract:

Region summaries of database data are stored in persistent memory of a storage cell. Because the region summaries are stored in persistent memory, when a storage cell is powered off and data in volatile memory is not retained, region summaries are nevertheless preserved in persistent memory. When the storage cell comes online, the region summaries already exist and may be used without the delay attendant to regenerating the region summaries stored in volatile memory.