data stores and creating the data dictionary

7/24/2019 Data Stores and Creating the Data Dictionary

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DATA STORES AND CREATINGTHE DATA DICTIONARY

JOANNE A


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DATA STORES

A data store is a repository for persistently storingolletions of !ata" s#$ as a database" a fle systemor a directory.

Store! !ata an %e of any type t$at can be renderedin digital ormat and placed in electronic media.

Digital &les 'te(t" i)age" *i!eo" a#!io" et.+

,ile syste)s

Data%ases

Diretory ser*ies

E)ail storage syste)s


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Data -o ele)ents are gro#pe! toget$er to for) a str#t#ralreor!. A !ata store is reate! for ea$ #ni/#e str#t#ral reo

D1

D2

D3


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DATA STORE FORM1. The data storeID2. The data store

name3. An alias for thetable4. A short description of the data

store5. The file type

6. The file format

7. Maim!m and a"era#e n!mber ofrecords on the file as $ell as the

#ro$th per year%. The file or data set name thatspecifies the file name& if 'no$n

(. The data str!ct!re sho!ld !se aname fo!nd in the data dictionary.

)omments are !sed for information thatdoes not fit into any of the abo"e

cate#ories.INFORMATION

IN!"DED ON T#E


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CREATING THE DATADICTIONARYA !ata !itionary 'also alle! system catalog+ is a ollof !esriptions of t$e !ata o%0ets or ite)s in a !ata for t$e %ene&t of #sers $o nee! to refer to t$e).

It is $ere t$e syste)s analyst goes to !e&ne or lo

infor)ation a%o#t entities" attri%#tes an! relations$ips oERD 'Entity Relations$ip Design+.


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CREATING THE DATADICTIONARY

DATA FLOWDIAGRAM

*CreateDiagram 0data fow


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2E(pan! !ata -o!iagra)s to reate

c$ild diagrams $i$are )ore !etaile!'e*ery proesse(plo!e!+.


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2Data -o!iagra) an!orrespon!ing!ata !itionaryentries

T$e #se of

algebraicnotation an!str#t#ral reor!s

allos t$e analystto !e*elop t$e!ata !itionaryan! t$e !ata -o!iagra)s #sing a

top-downapproach.


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END O, RE3ORT

data stores and creating the data dictionary

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