CMDBf Records Explained

CMDBf Records Explained
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  10/15/2014 Blog: BMC Atrium CMDB ... | BMC Communities 1/2 Communities bmc.comsearch ProductsMarket TopicsPartnersUser GroupsCustomer ProgramsSocial Help > All Places > Products > BMC Atrium > BMC Atrium CMDB > Blog BMC Atrium CMDB   31 Posts1   2   3  Share: | -by Van Wiles, Lead Integration Engineer  Here are some tips on how to use records in an implementation of the CMDBf spec.  The concept of a record in the CMDBf spec is simple and powerful. Like ITIL version 3, the CMDBf committee separated the notion of an item from thenotion of a record. (In case you didn't notice, ITIL v3 uses configuration item to refer to the actual thing under management, and configurationrecord to refer to a structured information record about that actual thing.)Like many simple and powerful things, records could be used the wrong way, leaving a so-called hole in your foot . Thus I am offering a bit of  explanation.An item can be associated with many records. This may be implemented as some sort of join by property on the item ID, or a set of unexposedrelationships. The important thing to remember is that a query for an item may return a mixed bag of records, some of the same record format(record type), and some of different formats. The first thing to know about records is that they could give you a clue what the item actually is. (If you hadn't noticed this, items and relationships don't have a type .) So if your item has a ComputerSystem record, it's probably some sort of computer system. If it has a ComputerSystem recordand a Switch record, well - I hope you get the picture. The committee chose this approach to allow maximum flexibility that supports but does notrequire a hierarchical or object-oriented data model.The specification does not differentiate between an is-a association and a has-a association. For example, if an item has a ComputerSystem record and a SupportContract record, is the item a computer system or a contract? That could be the first hole in your foot . There are two ways todeal with this. You could decide that in your world a support contract could be associated with any item and will never be a separately managed item.Thus you may structure your items as I just described. The problem comes up when this type of MDR is federated with another MDR that manages support contracts as separate items. In that federation, aquery for contracts may yield more items than the client expects. The other way to deal with this is to create a separate item with a SupportContract record and create a relationship with a SupportedBy record, where the relationship source is the item with the ComputerSystem record and thetarget is the item with the SupportContract record. This is a better way to model this, because in the most likely scenario, one MDR may have all the support contracts and know very little about thesupported configuration items.Think carefully about whether a record represents something that could be managed, or whether it is simply a collection of properties that could beassociated with any item or relationship.I guess I'll post more entries on this subject since there are several other tips to be considered. The postings on this blog are my own and don't necessarily represent BMC's opinion or position. 2858 Views 0 Comments Permalink Tags: cmdb, itil, cmdbf , federated, open_standards CMDBf Records Explained Posted by Van Wiles Nov 6, 2007 0   0Google +   0   0   0Buffer  10/15/2014 Blog: BMC Atrium CMDB ... | BMC Communities 2/2 Find PeopleCommunity Help Support LoginWorldwideAbout   © Copyright 2005-2014 BMC Software, Inc. Use of this site signifies your acceptance of BMC's Terms of Use, Privacy Policy and Cookie Notice.BMC, BMC Software, the BMC logos, and other BMC marks are trademarks or registered trademarks of BMC Software, Inc. in the U.S. and/or certainother countries.Manage Cookies   1   2   3   0   0Google +   0   0   New

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