It is the presentation on Advance DataBase Management System.DBTG model provides some function on db.

1. DBTG MODEL
RAMKRISHNA BHAGAT
MCA(L)

2. Content ◎ Introduction
◎ Need
◎ Architecture
◎ Comparison 2

3. DBTG Model
Data Base Task Group
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4. “
The Data Base Task Group of the
Conference on Data Systems
Languages (CODASYL), the
group responsible for
standardization of the
programming language COBOL.
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5. Introduction ◎ The structure consisting of two record types that are linked
together is referred to in the DBTG model as a DBTG set.
◎ In each DBTG set, one record type is designated as the
owner, and the other is designated as the member, of the
set.
◎ Each DBTG set can have any number of set occurrences
(actual instances of linked records).
◎ Since many-to-many links are disallowed, each set
occurrence has precisely one owner, and has zero or more
member records.
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6. Owner Member
Relationship
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7. Example of
DBTG Model
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8. ◎ The DBTG is intended to meet the
requirements of many distinct
programming languages.
◎ The DBTG data manipulation language
consists of a number of commands that
are embedded in a host language.
Need
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9. Architecture Storage Schema
◎ The storage
structure (Internal·
View) of the
database is
described by the
storage schema,
written in a Data
Storage Description
Language (DSDL).
(Internal· View)
Schema
◎ The schema
consists
essentially of
definitions of the
various type of
record in the
database.
( logical record types )
Subschema
◎ A subschema
consists
essentially of a
specification of
which schema
record types the
user is interested
in.
( External view)
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10. Comparison
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Relational
• A database model to
manage data as tuples
grouped into
relations.
• Arrange data in table.
• Represent both “one
to many or many to
many relationship.
• Easier to access data.
• Flexible
Hierarchical
• A structure of data
organized in a tree
like model using
parent, child
relationship.
• Arranges data in a
tree similar structure.
• Represents “one to
many “ relationship
• Difficult to access
data.
• Less Flexible
Network
• A database model that
allows multiple
records to be linked to
the same owner file.
• Organizes data in a
graph structure.
• Represent to “many to
many” relationship.
• Easier to access data.
• Flexible

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