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Conference azur::mcc

Title:DECmcc user notes file. Does not replace IPMT.
Notice:Use IPMT for problems. Newsletter location in note 6187
Moderator:TAEC::BEROUD
Created:Mon Aug 21 1989
Last Modified:Wed Jun 04 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:6497
Total number of notes:27359

494.0. "When to use DNS vs. local MIR ?" by OFFHK::LORD () Tue Nov 27 1990 07:25

   
    
	I'm working on the NMF CME Agent AM, and I keep coming up with
	cases where I'm not sure where we should be getting or putting
	instances and attributes.

	Is there any convention established for which commands reference
	the DNS database and which reference local repositories, and do
	some commands reference both in some particular order?

	Also, are all of an objects attributes which are stored in local
	MIRs also stored in the DNS database, or is the information in the
	DNS database simply used to locate the system which manages the
	object so the MIR on that system can be referenced?

	Thanks,

	- Rick Lord

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494.1goals of your storageGOSTE::CALLANDERTue Nov 27 1990 10:5533
    
    There are quite a few "good" answers to your question, but each
    answer needs to be weighed in light of your needs.
    
    There are pro's and con's to using DNS for storage, so first you
    need to define what your goals are in regards to the data you want
    to store. AFter you have defined the constraints of the problem
    we can better help you in determing what your needs are.
    
    Some questions that need to be reviewed/answered are:
    
    	- the scope of availability of the data 
          (per user, per system, per network)
    
    	- the data life span
    	  (short or long term; such as: computational data used in
	   anaylizing something would in many cases be short term, while things
	   like reference data is long term)
    
    	- usage of the data
    	  (do you want to be able to historically record the information?)
    
    	- access time 
    	  (DNS has overhead, can you processing/use of the data absorb
           this)
    

    Right now I don't have time to get into the ifs and whys of private
    versus public storage, so if some one else does, please do. Otherwise
    I will see what I can do about putting something in later.
    
    jill
        
494.2DECdns: A global naming serviceGDJUNK::HOULESteve, OSI NM is OUR future!Wed Nov 28 1990 06:589
    HI, -Just my opinion 
    
    Please only use DECdns for "global" information that will be accessed
    by a large number of applications/users/... And put in as little 
    information as possible.
    And as you said (re .0), use DECdns as a pointer to a system where
    the detailed information resides.
    ---DECdns is a global naming service and NOT a distributed database---
    ===Steve