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Survivor's Guide to 2007: Network and Systems Management: Page 7 of 12

EMA also has documented two fundamentally different CMDB systems, each of which may house many subsystems and variants. A desired-state CMDB is designed to support review and approval through a Change Advisory Board (ITIL's term). A discovered-state CMDB is targeted at real-time or near-real-time requirements for managing service performance across multiple data sources.

Typically, the desired-state CMDB is a database. A discovered-state CMDB is more likely a means of policy-based, time-reconciled visual access to multiple data sources. The two systems are complementary and can be used so that discovered state, based on policy, can be applied to populate the desired state through, in some cases, a system of caching.

We figure we're in Year 2 of what may well be a 10-to-20-year evolution process, so final exposition of what these two systems will look like remains "written in water."