Please enable JavaScript.
Coggle requires JavaScript to display documents.
Data & Information Management (DIM) chapter2 (database environment…
Data & Information Management (DIM) chapter2
database environment
ANSI-SPARC architecture
3 level
conceptual lvl
internal/ physical lvl
external lvl
objective
reason
data indenendence
logical data independance
physical data independence
data language
data definition language(DDL)
Data manipulation language(MDL)
pg92 -- 94(pdf pg)
data modeling and conceptual modeling
data model
type
record-based data model
relational data model
network data model
hierarchical data model
object-based data model
physical data model
conceptual modeling
DBMS
function
data storage, retrieval & update
user-accessible catalog
transaction support
concurrency control services
support for data communication
integrity services
services promote data independence
utility services
component (in chapter 1)