Techdocs Library > Presentations & Tools > IMS High Availability Large Database (HALDB)

Document Author:	Rich Lewis		Document ID:	PRS185
Doc. Organization:	Advanced Technical Support		Document Revised:	05/16/2008
Product(s) covered:	IMS

Abstract: As its name implies, High Availability Large Database (HALDB) provides both large databases and high availability benefits. HALDB supports databases with up to 1001 independently managed partitions. The large number of partitions allows IMS full function databases to grow to over 40 terabytes. HALDB provides greater availability through partition independence and parallel processing. Database processing, including maintenance activities, may be done in parallel. Each partition may be allocated, authorized, and reorganized independently. HALDB has a new pointer scheme for use with secondary indexes and logical relationships. This scheme eliminates some of the processing done by reorganizations. This presentation is an overview of HALDB capabilities and benefits. Partitioning, pointer schemes, and migration considerations are included. The presentation includes notes for most pages.

Classification:	Software	Category:	Planning and Design
Platform(s):	IBM System z Family	S/W Pillar(s):	Information Management
O/S:	OS/390	Keywords:	IMS , HALDB, High, Availability, Large, Database