ü GIS
were based on Proprietary data models in mid 1990’s.
ü They
are all file based models.
ü Creates
an inherent problem of data sharing.
ü To
overcome this , Spatial features are included.
ü Still
had a problem of limited scalability and inefficient for data recovery and
backups.
ü 3 types
of DBMS are evolved. They are;
Ø Relational
(RDBMS),
Ø Object
(ODBMS),
Ø Object-relational
(ORDBMS).
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