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Two-way Associations
Mostly, associations are travel in both directions, although not usually with same frequency. There are three approaches for the implementation.
Implementing it as a separate association object, i.e., independent of any class as shown in Figure. The association object can be implemented using two objects: one in forward direction and the other one in the reverse direction. This cause increases efficiency when hashing is used, instead of attribute pointer.
Figure: Implementation of association as an object
What are the states of transaction? The states of transaction are:- a) Active b) Partially committed c) Failed d) Aborted e )Committed f) Terminated
sql is relationally complete-justify
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#question. acompani datdbase needs to store information about employees (identified by a social security number,with salary and phone as attributes) and departments (identified by
Describe a technique for direct search? Explain how data is stored within a file so which direct searching can be performed. For a file of unordered fixed length records by u
Which two files are used during operation of the DBMS? Data dictionary and transaction log are two files used during operation of the DBMS.
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